DUMB Engineering Design Makes This Part IMPOSSIBLE To Make
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- Опубліковано 29 бер 2022
- In this video we venture into the world of designing in SolidWorks. Many engineers fail to understand the process in which machinist bring their creations to life. These simple tips will allow you to design for efficiency and will lower the manufacturing costs of your part.
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#CNC #Machining #Machinist - Наука та технологія
As a design engineer, I would greatly appreciate more videos explaining how to design for manufacturability. I want to make parts cheaper and easier but my schooling didn't touch on it.
Consult your nearest machinist.
@@jeffren70 Bro... I think he's doin that right now.
You basically need to understand the capabilities, tooling and rigging/vice setup of your machine shop. You need to understand what kind of machining operations they can do and how the raw material can be attached for all the needed machining operations. Usually it's easier to just show the 3D-model to a machinist from the particular workshop, who knows the manufacturing capabilities and ask "Can you make this?" or "How would you machine this?" and if it's a high volume part "Would you change something if you needed to make 250 pieces of these?".
The more intimate knowledge you have on the manufacturing process, the better you can design the part from the start to consider these manufacturing steps/capabilities.
I learned how to machine using old school techniques from my dad before I learned how to design.
It's impossible for me to design something without thinking about the tools necessary to make it. I suggest you try to arrange some time at a local shop to shadow a machinist and learn about how the process actually works :) trust me, they will be more receptive to this than you might think ... This is a huge problem in shops and they will LOVE to see a designer who is interested in making their lives easier :)
A niche in the market...
I'm a fulltime CAD designer and I can proudly say I knew all of these except making internal radii 10% higher of endmill size. But thats just because i'm a CNC nerd! Sadly 95% of my trade colleagues don't even know what a mill is. I've seen drawings at my work that straight up ashamed me. I can't imagine the amount of laughter that we've produces over the years... Apologies on behalf of all CAD designers out there!
Thanks for watching, Marc! I'm sure that you have made some very positive impact in your career as well. It's designers like yourself that we machinists love, keep it up, and share what you know with your colleagues!
I always talk to your machinist before and during prototyping. I respect them and they respect me. It's sad that a lot of engineers dont even think about tooling or fixturing during modeling
Same here. I am also a CAD designer. Sometime I see the drawings with tolerance that impossible if not cost too much to make. Also don't let me get started on the abuse of GD&T symbols.
can confirm, engineers have absolutely no idea about anything in the world. Source: graduating in a month with a masters in engineering, they don't teach you any of this
I would have thought CAD would have some built in ability to review/advise on the machinability of a part
This is the absolute best teaching video ever produced, because it contains "pearls of great value" packed into about 7 minutes. Can you please make a 2 hour long-form video with similar content? Also, can you and the Titan team design a paid internship curriculum to train an individual with an existing AAS degree, or degree's in precision machining technology and engineering drafting and design? Your program would be considered a graduate program. I would pay $10,000 or more, cash on the barrel head, to be trained by your team. Boom! Lets do it.
Hi Marc! I think it would be good to do a more in depth version of this in the future for the academy. We will see what we come up with! Thanks for watching brother!
@@barrysetzer a Titans of CNC podcast would be awesome, one hour a week. its also great marketing and can be really educational. talk to shop owners and machinists and designers
Awesome video
they made a great short educative video and you made the best suggestion. please guys come over to give likes so titans team will consider the idea.
I would love to watch a long form version of this!
A 1" cube costs $0.50. A 1.0000" cube costs $5,000. Have you ever gotten a total part mass or CG tolerance? I could see in some racing or aerospace applications this could matter.
I experienced a similar thing a year ago during my schooling to be a mechanical engineer, except I was the one who designed the part, and had to machine it. Immediately after looking at my drawing then the lathe, I went home and changed the design because I hadn't considered the huge amount of time it would take to machine.
If an engineer doesn't know how to efficiently make a part, I don't consider them a good engineer, more so just a 3d artist.
manufacturing is a broad area. Your design engineer should know materials and their properties to know how to achieve best outcome for their design intent. Knowing CNC in-depth is not neccessarily their job. This is why you have your CNC operators, they will assist you in modifying your design because each workshop works differently, use different machines, tools and work to different guidelines. But yeah, knowing these things would help you as a Design Engineer to get across the finish line faster and cheaper if you deal only with milled components. More often than not you'll be doing injection moulded, milled, sheet metal, weldments and so on, so unless you sport 12 years of design experience it may be a tall order.
You caught that though, as you had to make it.
I think irrespective of the industry you're in, a lot of natural efficiency comes from an expert in one field have some knowledge of the related ones.
Actually, I think I'd go further - you can't be an expert in your field, unless you know the basics of the adjacent domains.
Couldn't tell how many times in 30+ years I questioned dumb tolerances on prints. Just to see them changed or eliminated. The sharp corner 2" deep was good, but the .02 dia end mill @ 2.0 long was even better. About fell out my chair. You're keeping it real Barry!
Best thing is a tight toleranced hole which is only annoying for the people who assemble it afterwards and they come to you and tell you to mill it a little bit bigger next time :D
MAKE MORE OF THESE! This is a gold mine of information for us engineer students and they don't (and never will) teach us any of these in school
I deal with small corners pretty often, best solution I have is smallest drill possible, mill pocket then finish corner with vertical broach. Then use what I call a floor broach to get the last bit at the bottom. Its much faster than edm but requires custom tooling.
I was going to say, a broach will do sharp internal corners.
@@myid9876543 and every hole will be exactly the same shape and tolerance.
I worked with my family's sheet metal shop for 20 years, and I have seen so many situations like these with engineers designing things with no concept of how to make them. I remember one in particular wanted louvers on 14ga stainless steel, and we said no (that would destroy our tools). They came back a while later for us to build some other things, and they had the part they wanted made elsewhere. The part was made in much thinner 20ga, and the customer had no idea. "Yea we got it in 14ga. "
People often don't know what they need, but they usually listen when you say "we can save some money."
That quote at the beginning was gold. Means he didn't know what an engineer's job is. We leave the impossible designs to the architects so we can laugh a bit as well! 😉
You could also thread the holes before machining the pockets, then you can use a form tap and not worry about deformation of the pocket wall.
But then ur thread might deform after you mill the walls
@@cyber2526 depending on thread tolerance,threading it before and after might be enough
True, but ideally, the designer would consider this issue before we needed to think about it ;)
In this specific operation but what if the walls were cut from the opposite side? The point is… A designer should think about all the small details and design efficiency and quality into the parts so very little thought has to go into it later. The truth is… 10 machinist will do it 10 different ways, so design in such a way that minimizes mistakes or people having to over think it.
Sure, but I'd bet with only 12 thou walls, a thread guage won't go in. The threaded hole will collapse. Or when you insert the fastener, the wall will push back and show a bulge.
When I have holes close to walls, I do the drilling and tapping first, then cut the walls. Mush threads into my pockets, will you? I’ll show you who’s boss! 😎 Another great vid, Barry. Thanks! 🖖😀
This is why Engineers who were Machinists are the best designers! I have 16 years CNC machining, 7 years programming, 10 years designing, and I am getting my Bachelor's degree in Mechanical Engineering this month. I tell you, when you have been the person who had to make difficult parts you are always thinking about how you can make them simpler and easier to make.
That's awesome congratulations man 🙌
I love this video, very informative! As an Engineer in design and production, I love to spend time with the machinist. As soon as I do a design I spend time with the machinists to determine a workaround on some ares, such as this design you have here. It saves a lot of time and time is money!
I’m an engineer and working lately with machinist and 3d-printers has really made me understand how design choices that have zero to tiny effect on function can have a huge impact on the manufacturing costs.
As someone who is self taught and learning all of this at home on my own, I can’t even emphasize how much this value this video is to me, Thank You!
This is one of the most valuable videos I've ever watched. This is amazing and something that has never been taught to me in any of my studies. A lot of the time when designing parts the chamfers, round overs and fillets are chosen simply because they look nice or for no reason whatsoever, its just the number that was picked when it came time to make the corners "not square". Knowing these things is absolutely awesome, not only because it makes your job easier when I implement them but I can take more pride in my work as well, knowing I've put in all these time saving and part improving changes! The best thing anyone doing anything one step down the line can do is tell the people one step further up the line what would make their job easier!
Hey Cris, thanks for watching. Glad you did, and so are any machinists that will make your parts in the future!
As an engineer myself, whoever told you it's a positive thing an engineer can design something a machinist can't make is WAY off base. A monkey with a computer can make something that isn't manufacturable. It's not a positive skill, it's a lack of skill/knowledge that results in an unmakable part.
In my situation, I work with the government ALOT (can't say what for). And we get a lot of unmakable/terribly overcomplicated parts. Most of them are just because the government contractor has such a huge budget, they don't care if it costs a fortune to make, they only care about the deliverable date. So if we ever ask them if we can optimize the design better, we don't say "it's to save money", say "it will save time." For example, we once had to machine a 5 ft x 5 ft x 6in the tall lid for a box, that effectively had the cross-section of l______l. Could have easily been made of sheet metal, but the contractor said no. So instead we had to quote a shop to get a 5ft x 5ft x 6in SLAB of aluminum and machine off like 80-90% of it...for a cover to a box. I think that is still the most expensive part we have ever had to order.
If the part is just "unmakeable" prepare for a LONG drawn out discussion where they try to claim it can be made if -Blank- the process is used blah blah blah. Typically ends with us having to get like 5 or more machine shops to all come back and say the same thing for them to budge on changing the design. But they will still likely never update their print, even after that. So then their quality department may catch the difference and we have the discussion with them this time because they were not in the loop the first time it was discussed.
I have personally seen degreed engineers (right out of college) do these very things. The best engineers have a machining background and a natural mechanical ability, along with common sense, not just a piece of paper. Very well illustrated Barry. Thanks.
Thanks Ray! Its a discussion that alot of us wish we could have, so hopefully this video helps!
They don't teach DFMA at most engineering schools. Certainly not as a requirement. It's a shame, but a lot of this is learned on the job. Having a machining background is helpful but remember many engineers are designing for tons of different processes, so there's no way to have hands-on experience in all of them. In just the past year I've designed parts for milling, turning, swiss lathe, water jet, laser cut, punching, forming (sheet metal), etching, injection molding, extrusion, permanent mold casting, spot welding, Tig welding, wire EDM, and 3d printing... With plenty of other processes throughout my career as well.
Machining of all sorts is obviously bread and butter for many engineers, but learning how to design for different processes by educating yourself (such as by watching videos like this!) and talking to your vendors is key. Heck, despite working closely with machinists for years, I had never heard about the oversizing of corner radii. Makes perfect sense, but nobody ever mentioned it (including engineers who own and regularly operate CNC mills that I work with). Always be learning!
@@jmblur I totally agree. Thanks for the reply.
@@jmblur totally agree. I just posted something similar. As engineers we always get flak from all sorts of people who think "how dumb that the engineer didn't know how to do this" "they just have a piece of paper and no common sense" etc. People don't realize the broad amount of topics we get involved in due to our ability to solve problems. When you get the same problem to solve over and over then of course you become efficient at it and consider these efficiencies in your design.
However, I find myself getting pulled into all sorts of new issues and having to apply all different bits of my knowledge and problem solving skills to propose solutions. If people who specialize in a topic suggest something different, we see if that still meets the design intent/ objectives and accept it or reject it. Often when we reject a modification, people get mad it's because they either don't understanding all the constraints we have to work with or they don't prioritize those constraints the same way as we do.
This is such a great summary. Will be sharing this with all my junior engineers (and few senior engineers...)
I continue to learn from these videos. Thank you for continuing to post. Much love and gratitude.
Great informative video!! Short and to the point. Worked in various manufacturing positions for over 15 years before I started working in engineering and those years of manufacturing experience have proven to be invaluable to my engineering work now. Everything I learned in the years of manufacturing are not taught in engineering classes in college. One recommendation I would have for anyone going into engineering would be to actually working in manufacturing for a while to get a better understanding. Also, one thing to add to your information here Barry would be to make sure as a designer/engineer have open communication with your toolroom and the person programming the parts you design. As a Tooling Engineer, I am constantly talking to our programmers in the toolroom to make sure my tool designs will easy for machining.
Yessss! An open (and open minded) dialogue between engineering and manufacturing can completely change the way things are made. Great comment!
I can’t agree more
hell yeah. I also design and follow some of the points out of pure feeling or because I was once told but not why. A coherent explanation like this makes designing a lot easier.
That was great to watch and listen too. You spoke with a lot of humility and calmness.
I can confirm the unnecessary tolerances, very often when I would get parts machined I would never even look or make changes to the tolerances and just send my part out, and confuse whoever I was working with. This is a very helpful video, thank you
Great video. Very well explained and simple to follow. And this is why I'm learning how to program tool paths when I design machined parts. I want to check and optimise actual validity of my design before it get's given to the machine shop. (We actually have CAM programmers but I don't like to give people poor designs in the first place).
Good video. I've always felt that most companies would help their bottom line by adding cost benefit analysis to the design process before releasing designs for production. I've encounter every single point highlighted in this video. Often I would know who (without looking at the title block) designed it by looking at the call outs and features. 🤔
Great video! As an engineer I love learning about design for manufacture!
Thanks for watching, Chris! YOU are my target audience on this one!
Although I served an engineering apprenticeship I eventually earned a degree in engineering and became a Professional Engineer. I was a designer (now retired).
My "hands-on" early career gave me a practical insight into design in addition to the academic education. I was fortunate in that the workshop was two interior doors away from the design office so I would spend time consulting with the shop floor experts about the best way to approach new concepts of manufacture.
My engineering career was the best time of my life. A great feeling of achievement.
I wanted a video like this for awhile. Thanks Titans!
didn't expect to have such an awesome start to the day with my morning coffee!
You can also use thread forming bolts, these are awesome in some circumstances. Sharp corners in aluminum, that's asking for cracks.
I've had a few moments where the designers underestimated our abilities. They brought us a bunch of castings once and the machinists fought with hard spots and bad castings for about a month. One day I asked permission to give it a go from solid 4140. I had the design modeled and machined in two shifts and the cycle time was faster than the castings + the end result was a pristine component. The engineers were astonished that we could do that. CNC + CADCAM has really let us fly in the machine shops
I'm a mechanical engineer. At no time in my ME education were things like this ever discussed. I worked as a machinist for 3 years before going to college so I already knew about some of these things but I learned about tolerancing, surface finishes, etc on the job for the most part. It would be nice if more of this stuff would be taught in ME curriculum.
Sign me up for a video series specifically aimed at engineers and DFM. You guys do amazing work and really cater to the machinists and programmers, but these parts all come from somewhere and it's usually from an engineer. You could have just as big of an impact on the engineering community as you do on the machinist community if you put out more videos like this.
This is the best DFM video I have ever watched.
i have never done any machining. but i do alot of industiral machinery integration and troubleshooting.... but the issues you come across with the design process has been very relatable to issues i have to deal with occassionally... either way i love the challenge of the problem solving dealing with these kind of issues... you all are very smart and ontop of your trade.... Keep up the precision work and pride in your work... we appreciate it.~
Great tips. Looking forward to learning more from you.
In WW2 There was a huge program of making production cheaper and more efficient, it made an enormous difference maybe even won the war.
Thanks man, tips helped a lot! Would love to see more if there are any!
This should be required viewing for all design engineers. As a programmer, I have had multiple conversations with engineers on all of the topics covered in this video. However, the engineers where I work still insist on using unilateral tolerances.
Another Great Video. A must watch for all would be designers!!!
This is a great topic to touch on. They don't teach this type of topic in a machining program. The only way you're gonna know this is working in a shop and learning through trial and error. Great video Barry
Thanks for watching, Drew!
Great video for pure machining, but worth mentioning that new processes are coming to maturity that make certain types of parts or features possible. An example of this would be making that hexagonal part via UAM (Ultrasonic Additive Manufacturing) where sharp corners would be entirely possible.
With hybrid manufacturing utilizing a mix of both additive processes and traditional machining being the way forward, videos like these detailing the limits of particular processes and design considerations will be a must for any engineer
Great point! But even though additive isnt NEW, it is still in its infancy, especially from an adoption perspective. Many industries are slow to adopt, like aerospace. But your comment is on point. As i said at the end of this video: if you have a good understanding of the process that’s going to make your part? Youll save money!
Very good and informative video. Please do more videos like these. Design engineers have to stumble upon those infos because it is rarely the case that they learn this in university or at training.
I need to save this and share it with the ME's I deal with as some of them have a tendency of either putting a way too small wall fillet or sharp inside corners and always have to get onto their case about it, plus factoring in that we are in inch so metric sizes sometimes doesn't help either when it is converted automatically to inches for us in mastercam.
I believe that it almost a must for a designer to have practical experience, specifically on manual machines or low budget home shop machines. It is very educational to encounter all these issues with those machines because they allow way less from the design when it comes to these points. I design as if I have to make the parts myself and consider everything from fixturing, tools, commonly available tools in chains, material properties and so on. If I can design it to be made on my low budget diy portal milling machine it should be very easy for the machine shops.
I get positive feedback on the designs so it appears that this approach is succesfull (I ask for feedback on the designs I make from manufacturing, assembly and maintenance departments)
Great video. I'm a design engineer and pride myself on owning a mill and lathe and having a "better" understanding of how to machine than the average engineer (I figure if I can't machine it myself, I shouldn't design it that way). With that said, still some great advice and techniques I hadn't thought of. Using a radius larger than the mill radius to stop an instantaneous change is something I've never even considered!
this is great im a mechanical engineering student. very informative and this guy definitely knows what he’s talking aboit
I love how your voice dropped to death when you were at "let's pretend a 2 inch long .030 diameter end mill existed 😂
I'm not even an engineer and just by seeing the part I was like "what the fuck were they thinking?"
Taking this our designers this morning. Good food for them and me.
Great! Thats exactly what I hoped this video would accomplish!
had a lot of machinist colleagues whilst studing mech. engineering. all of them said the same story of engineers designing unmachinable part. yet we didn't really learn a whole lot of techniques about how to do it. very cool video thx
Thank YOU for watching! My hope when making this video was that a few engineers would end up seeing and sharing!
I loved this video, PLEASE KEEP MAKING THEM
I wish our shop would go to threadmilling. We had to put a 2 1/4- 6 tapped hole in hastoloy b3 , and our tooling coordinator told use we could not afford to buy and use a thread mill so just to put a tap in and use that. Oh we also had to tap 16 holes on this one part.
GROSS!!!!!!! Did you see this one I did last week with an inserted threadmill, making that exact size thread? ua-cam.com/video/aTE-5yxCADg/v-deo.html
learned so much from this video , thnx for sharing all this valuble information
This is great. While I know and pay attention to this when I design parts, knowing specific numbers helps.
On my drawings when I have floor or corner rads I'm not bothered about I usually just put a R3.0 MAX tolerance on it with a note for the machinist to choose the rad. Probably not too professional but I haven't had any complaints about it.
Thank you Barry for the insight on today's 06-20-24 event "Manufacturing Greatness with SW & Barry"
No problem Auday! Thanks for joining us!
man . you are discovered the america . anyway i enjoyed the video . ! its pretty nice from your company to educate the world.
I'm a framer in South America and this video was so helpful. explain more stuff, different stuff?
Great tips, thank you!
Keep up the great work!! 👍
Awesome practical insight! THx.
Thanks for watching, Swami!
Good video! Design engineer here too. Make some more.
we just did a part with ten internal hexagons for holding bolts, it was designed with sharp corners and we ended up getting the OK to drill partway outside the corners with a .125" and finishing the pockets with a 1/4' endmill.
Thanks! Great video.
AS AN ENGINEER WHO OWNS A MACHINESHOP WONNNNDERFUL VIDEO EVERY ENGINEER NEEDS TO WATCH THIS!
Thanks CJ!
Soo true.... If you want to save your company money, get your designers to know a little bit about manufacturing processes
At our company we have a bunch of brass parts with stupid tolerances that were way to tight. We usually get them from either our sister company in Germany that specialises in Brass for automotive or some Turkish company. The German company produced them on spec and measured it with CMMs and we checked it our inbound QC with another CMM. The Turkish supply didn't measure anything (maybe with calipers) and the parts missed some tolerances. When we asked the production if they could still use those parts they were confused as the tolerances were irrelevant for the function of the part.
The problem with most young engineers in particular is that they have no idea how stuff is made and CAD just facilitates this issue because you can design stuff that is either unrealistic or ridiculously expensive to make. Fortunately most of them learn over time and listen, but some of the more arrogant ones don't and in the end it costs them or their company a lot of money. I reckon I could make a fortune consulting on some projects just by taking 10% of the money they save just by reviewing the parts and giving practical advice like in the video. There used to be people called Design Draftsmen who were in between the engineers and machinists/manufacturers who actually did the final drawings and were generally competent tradesman themselves, they would filter out a lot of these issues before it would even be quoted. CAD basically made these people redundant, but it hasn't necessarily made the system better. Machinists beware though, giving away to much free advice can sometimes see you advise yourself clean out of a Job. We quoted a job once that would have been about $100k a year worth of parts. The engineers design worked out to about 2.5 hours of machining, mostly because of the issues expressed in this video. We redesigned the part with out changing any important features and got that down to about 45 minutes. We then suggested we could get that down to about 20 if they got an extrusion of a specific shape (it was Aluminium). The engineer then went Oh well we can just extrude this or punch it out of sheet metal and that was the end of the job. Now you'd think saving the customer $500k over a 5 year run would engender some good will in other areas, but nope. We barely get any other work on that project.
As the primary designer at my company I guess I should really pay attention to most of what you had to say here as often I get trapped into pure design thinking and don't come up for air to see that I made the part far more complicated than it needed to be. It's tough being a designer trying to come up with solutions to problems and then to remember that someone has to make that thing.
Man I feel your pain! But I know there are alot of designers out there that wish they knew some of this stuff, so now that I have an effective “pulpit” to preach from, I thought I would share. Thanks for watching!
That's why it's vital to discuss parts with whoever is manufacturing them. They're the process specialist, consult them so you don't have to be. Though they're so used to "making do" it's often takes a while to get useful feedback from them.
DFM is something I have to keep in mind as a hobbyist with a 3d printer, I can imagine it's even more important with these industrial machines.
Great videos thumb up!
Awesome Info Baz 👍
thank you!
I love what you do. I would love to be an employee in your shop.
Similar thought process with FDM 3D printing. It’s not simply designing and forcing the print with various slicing methods. Design, slice using the desired parameters for the part, look for issues, then tweak the design as needed. Of course SLS and other printing methods allow for different design considerations.
The designer sat at his drafting board A wealth of knowledge in his head was stored Like "What can be done on a radial drill Or a turret lathe or a vertical mill?”
But above all things a knack he had Of driving gentle machinists mad. So he mused as he thoughtfully scratched his bean "Just how can I make this thing hard to machine?
If I make this perfect body straight The job had ought to come out first rate But would be so easy to turn and bore That it would never make a machinist sore
So I'll put a compound taper there And a couple of angles to make them swear And brass would work for this little gear But its too damned easy to work I fear
So just to make the machinist squeal I'll make him mill it from tungsten steel And I'll put these holes that hold the cap Down underneath where they can't be tapped
Now if they can make this it'll just be luck Cause it can't be held by dog or chuck And it can't be planed and it cant be ground So I feel my design is unusually sound.
And he shouted in glee, "Success at last! This dam thing can't even be cast.
Lol i love this. Never heard it before
I'll save me this. As a reminder of designing parts with production in mind.
About 25 years ago I (QE) dropped off a drawing at a machine shop and got a call about ten minutes later from the shop that the drawing was "physically impossible to exist" as drawn, but they were pretty sure what was intended.
I spent a decade trying to get our design engineering department to adopt GD&T standards, but I finally just gave up. Instead they listed all their drawings as "reference only" so they wouldn't have to fix any of them.
A lot of good information thank you
Like many others, as a mechanical engineer designer, I would hate to become that guy that asks stupid things from the machinists.
I love these videos, it shows me exactly what to avoid to make sure everyone in the chain can have the easiest (and cheapest) time
Great video!
im a mechanical engineering student and it is my second greatest fear (after designing a non functional product) to be _that_ engineer the guys in the shop make fun of for making non-manufacturable parts.
greetings from germany! im at one of the best engineering universities in germany and i have never heard those 'rules of thumb' like the 10% wall fillet one and the standard floor fillet radii
noted, thanks!
As a young design engineer thirty years ago I learned that I needed to be out in the shop. The machinists I worked with appreciated engineers that would work with them to come up with producible designs. I have learned a great deal from highly skilled machinists throughout my career.
Getting laughed at or even chewed out by a crusty old machinist is one of the best ways to learn. Do not be afraid to make mistakes, just make sure you learn from them. That is how all the best engineers got to where they are.
Get those tapped holes in before the pockets and you don't have to worry about blowing the walls out. Also if your going to scrap a part those tapped holes as a last op would be the one. Great video and as a machinist turned design engineer some essential information. You need to do a sheet metal one next ;)
Very well said.
These design issues are the bane of every machinist, not only cnc. I'd always ask a design engineer if they could live with a corner radius on a part. more often than not they could and it would drastically reduce the cycle time. You are preaching to the choir of machinists here!
Yeah! I thought it would be cool if 1,000 designers end up watching this, and sharing it with their colleagues. Maybe eventually we will see a little bit less of this on the shop floor!
This is a very helpful video. Would this be considered a "best practice " video? Trying to find others like it.
Thank god for this video, so many times i can see unnecessary or stupid tolerances on aerospace drawings. Especially on new ones. Designers coming out of school have no idea and just put -.001 +.000 tolerances on everything. One of most stupid one i saw was like a washer thingy from PTFE???? that thing changes size as soon leaving the machine. I can force trough +.005 pins trough it if i want to, but that just one of a thing. Blind hole threads(small ones) with a minimum requirement lenght of thread and a max lenght of hole (which leaving no room to the end of tap), so we end up with thread milling then finish by hand with a relieved tap. very annoying slow and expensive process.
The only time I specified a part that wasn't designed for nominal tolerances was for an ASME section 3 part, which being nuclear grade already increases the cost by a factor of 100.
Please, more videos like this o a tutorial about it. I am a mechanical engineer and i am always facing challenges about how to design my part with machining eficiente.
Thank you for watching, Luis. We are discussing making a longer video, but just listening to what I said in this video will save you alot of money on your designs.
Just a thought. machine a 'mold' for that aluminum and then use it to make an aluminum casting. Not ideal, but it might work.
Good content. As a mechanical designer, you can easily get carried away making part designs that are precise, but impractical if you don't consider fabrication... If you are given 5 minutes to design something your focused on function, but if you decide to work on it while on a 6hour flight, it turns into a masterpiece..
Your are videos are very insightful and sometimes concrete the things that I've been saying to the boss so I can share these and he's convinced
We love to hear that. Our goal is to help, and provide education at many levels. Sometimes, educating someone is as simple as sharing a UA-cam link ;)
That first part about "Engineers are better than machinists because they can design a part a machinist can't make" is such perfect irony. As if the most perfect part is a part that cannot exist outside of your imagination, and anything real is a crude imitation. The perfect part is an efficient part, the one that meets all the constraints and requirements, and nothing more. A design does not fulfill any requirements, especially when "can be fabricated" is the most basic requirement.
EXACTLY! Thanks for watching, brother!
valuable lessons here.
This is why it is important for designers and engineers to have at least a basic understanding of fabrication processes. Over the years I have received many sets of plans that contained elements that were either impractical or impossible to execute as drawn.
Very very new to learning about CNC. But, if the time for cnc'ing this part and the difficult makes the part cost prohibitive. Due to the relative simplicity of the part, is there a reason to not make the part using something else and make a mold then cast?
It’s for this reason that I learned 3D printing, welding, and as soon as I can afford it, cnc machining. I design parts and I want to know exactly the best way to make them and design accordingly.
One way would be to make the drill and taps the first op. Then rough out the hei patterns with end mills. Mill an electrode undersized to mirror the entire part and let that catch the sharp corners with the sinker edm
You can get the corners with a shaper machine. Get a CNC to hold a shaper bit and use it as a shaper machine.