Harmonic Drive co. actually sells both cycloidal drives and planetary gearboxes under the same name. I picked up two used planetary gearboxes before I clicked to this little twist. Planetary gearboxes will work well for this application but keep in mind that there is some noticable backlash on the input shaft, so compensation via software is needed. The output shaft is characterized as "low backlash" and is almost immeasurable from my experience.
nice project, i vould do the same but i'm scared about backlash using normal planetary reduction drive.. and the strain wave generator gearbox is too expensive..
Vince, how is the servo shaft connected to the gear box? I see the shaft on the servo and the hole on the greabox, but is there a key on the servo that matches a key slot on the gear box? Is there any other set screws or something? Thanks,
@@advanceair ah, it might be just fine i guess. But if i was to build it i would use 20-25mm as back plate ( 0.8-1"). All of the cutting forces have to pass through it, so better safe then sorry. And of course good quality steel, the best option would be cast iron, but if that isn't suitable or out of price i would go with machine or tool steel. Or did you already think of this?
@@advanceair with your options i would go with the toolsteel. Cast iron is relatively simply obtained, but you'd need to have connections. Stress less steel doesn't help that much because machines put new stresses in the material, but i don't think that is a issue. Some good quality steel (in Europe S355), or tool steel will do the job just fine (in Europe c20-c45 or 42CrMo4). But I am guessing you already have something in mind?
I see you do not use pins to fix the parts only screws? What hold parts together against each other in directions where screws not work. Only friction? Is it enough?
Great job! But let me disappoint you a bit, Vince. Zero backlash of this gearbox is not so zero. More likely "zero". 5 arc minutes on the edge of your 160mm chuck will give approximately 0.116mm of backlash. Sorry. Think about to add some breakstop device to it.
Awesome machine, I noticed that it looks like you have used a bt30 spindle with no driving dogs. Do you find that you have problems with the holder slipping during machining ?
it sure does look lie one of the holes on the output ring is different than the 5 others. It looks like they forgot to tap it, you have your thumb over it at 17:09.
Wow great catch. One of the holes is different, first I thought they forgot to tap but than when I measured it was larger diameter, I assume is for some kind of pin or something
Gear box used in this build is Planetary Gearbox not Harmonic drive, Don't know how I got that name stuck in my head, time for a new head
I hope it will work fine, as it is not cheap indeed !
I'll take the old head.
Harmonic Drive co. actually sells both cycloidal drives and planetary gearboxes under the same name. I picked up two used planetary gearboxes before I clicked to this little twist. Planetary gearboxes will work well for this application but keep in mind that there is some noticable backlash on the input shaft, so compensation via software is needed. The output shaft is characterized as "low backlash" and is almost immeasurable from my experience.
Thank you for info. Mach4 has some backlash compensation I am hoping it will work for this.
nice project, i vould do the same but i'm scared about backlash using normal planetary reduction drive.. and the strain wave generator gearbox is too expensive..
His machine was far better than those advertised. Simply fantastic. My jaw just dropped as always when watching his videos. A million THUMBS up.
Thank you.
Watched the whole video not realizing it was a fresh upload. I cannot wait for the next video!
Coming soon
hello vince..very good 4th axis...thanks for your time
Thank you Buddy
The CNC is working great!
Good MIC.....nice build...
Very nice!!!
The only thing I'd do differently is make a different adapter plate for the stepper to the gearbox, so that it acts as the fourth side of the cube.
Vince, how is the servo shaft connected to the gear box? I see the shaft on the servo and the hole on the greabox, but is there a key on the servo that matches a key slot on the gear box? Is there any other set screws or something? Thanks,
Hi Patrick, it has built in Coupling
Great job, you are a hard-working. What's next, 5axis table?
Thank you, I am always planing
Excelente tus máquinas muy niña tu explicación
Great job sir, thanks a lot
beautifully done beautiful work
Very nice job, i love your videos!
very cool, I have a subscription, by the way I also made the 4th axis, it turned out quite budget, you can look))
Wow looks great! I would consider making a thicker back plate for tge chuck tho. In your fusion model it looks to be a little bit thin
I am planing on .500 steel. Hope that is enough
@@advanceair ah, it might be just fine i guess. But if i was to build it i would use 20-25mm as back plate ( 0.8-1"). All of the cutting forces have to pass through it, so better safe then sorry. And of course good quality steel, the best option would be cast iron, but if that isn't suitable or out of price i would go with machine or tool steel. Or did you already think of this?
I would like cast iron but can’t get it easy. I will get tool steel or stress less steel. I do have 1” aluminum but I don’t think it’s good Option.
@@advanceair with your options i would go with the toolsteel. Cast iron is relatively simply obtained, but you'd need to have connections. Stress less steel doesn't help that much because machines put new stresses in the material, but i don't think that is a issue. Some good quality steel (in Europe S355), or tool steel will do the job just fine (in Europe c20-c45 or 42CrMo4). But I am guessing you already have something in mind?
How long do I have to wait for my tree to grow harmonic drive?
Any plans to make a nice little 12 slot tool carousel, or a atc of any kind?
Not for this one. Maybe next machine
Hi, Very Nice !
Can you provide more information on the harmonic drive, and where did you get it? Thanks
posted link in description
@@advanceair Thanks a lot
Great video. What spindle is that you are using on your mill?
I have link on CNC build for it
I see you do not use pins to fix the parts only screws? What hold parts together against each other in directions where screws not work. Only friction? Is it enough?
i dont understand why would you need 4 jaws chuck when you can already control your z axis.
Amazing, but I would like to know where did you bought the gearbox?
AliExpress
do you have any backlash or any small movement after you installed chuck ?
base on what I can measure it less than .001"
Whats your z axis travel from table nose
I hate so much the noise of the stepper motors.
Compliments for the upgrade
Great job! But let me disappoint you a bit, Vince. Zero backlash of this gearbox is not so zero. More likely "zero". 5 arc minutes on the edge of your 160mm chuck will give approximately 0.116mm of backlash. Sorry. Think about to add some breakstop device to it.
Thank you Andrew, hope backlash compensation in Mach4 helps a bit
good work ,
what is the cam software ?
I like this project, did I hear you say you have drawings for this machine?
Hello vince! Thank you for a video!
Welcome!
Awesome machine, I noticed that it looks like you have used a bt30 spindle with no driving dogs. Do you find that you have problems with the holder slipping during machining ?
Thank you ! It’s is ISO30, same as BT30 but without dogs. So far had no problem with slipping
can you share the all designs that you did on 03:40. thanks
did you consider a hypocycloidal gearbox? they are cool. also, those 1" aluminum plates are awesome- where did you buy them from?
I am lucky to have company called metal supermarkets which sell to public in our town
Great video, Vince. Will you be posting your Fusion 360 files?
Been waiting for this!
Great video!
Glad you enjoyed it
@@advanceair In the future do you think you'll try to make a 5th axis trunnion?
Hey 👋 , i use 4th axis on my my vmc cnc with "8037M controller"..?????
Help me.🙏
downtown mafia 😄
Lmao. The intro song. If you know, you know
What is the stepper motor? Have a link?
It’s just nema 34 closed loop
Do you have a link to this harmonic drive?
Thanks :)
Check description please
@@advanceair Thanks :)
hello to ask where do you buy the aluminum sheets
I got them from my local metal shop. We have one locally
Amazing 👌👌 that tree name on which you grow that gear box 😂
Haha. It out Canadian great box tree. 😂
Thats not a harmonic drive...thats a planetary gearbox.
Thank you for correction , dont know how i got wrong term stuck in my head. will pin comment on top
can you give me that document file ???
What is this CAD that you showed ?.
You mean program? It’s fusion360
@@advanceair , Yes. CAD stands for " Computer Aided Design ". Grateful for the information about the program.
You are welcome
Cost of that motor and gearbox?
$500
it sure does look lie one of the holes on the output ring is different than the 5 others. It looks like they forgot to tap it, you have your thumb over it at 17:09.
Wow great catch. One of the holes is different, first I thought they forgot to tap but than when I measured it was larger diameter, I assume is for some kind of pin or something
whats software used ???
To design, Fusion360
@@advanceair and that program has for properties of matter and weight of the material ...
Yes it has simulations
ES ALUMINIO? POR QUE NO ACERO
Как же это охуенно )
三欧卡盘质量太差，我发现外国人真的太喜欢步进电机了，中国基本淘汰了。
哈哈大笑