Treadmill Motor Bandsaw Conversion Variable Speed Power Supply Metal Cutting Blades Wood Cutting Saw
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- Опубліковано 30 лис 2022
- I wanted to convert my wood cutting bandsaw into a metal cutting bandsaw and to do so needed to be able to slow it way down. A treadmill motor give me a huge range of adjustability. Everything was DIY including the power supply and the drive pulley.
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Affiliate links to items in this video:
This is the rectifier I am using
amzn.to/3GjVCao
150K potentiometer amzn.to/3zxc96l
20K potentiometer amzn.to/3Srib1a
120K potentiometer came from eBay
This is the SCR I am using amzn.to/3IQAVTL
If you are not in a hurry one can be had from eBay for about 2/3 the cost but could take several months to ship.
20 Amp circuit breaker amzn.to/3ufQDRh
15 Amp circuit breaker amzn.to/3FgoQGP
This is the PWM signal generator I am using for the MC-2100 amzn.to/3z3ivu3
Digital Non-Contact Tachometer amzn.to/3gQa7Jj
The choke in most of my videos is part number 130993. Instead of getting one new I would get a used one. A lot of treadmills come with a choke. Go to eBay and search “treadmill motor choke” BUT know that most people on eBay don’t know what they have and the word "transformer" will also appear in most listings. Problem is a choke and a transformer look almost identical so some listings are for transformers and some are fore chokes because the sellers think they are interchangeable. They are not. They would only be interchangeable if you modify a transformer to work as a choke. (see my DIY choke video) To tell the difference count the wires. A choke will only have 2, a transformer will have 3 or more. Please let me know if I can be of further assistance. - Авто та транспорт
Very good, informative and interesting video. Thank you.
my pleasure
I'm Interested in this project. Thanks for sharing.
glad you liked it!!
Love your videos! You’re so clear, concise and easy to understand. I want to find a motor for my wood lathe. Can you do a video on what kind of treadmills look for that have the best motors for converting shop machinery? Thanks!
Let me think about it. That might be a hard video to make because the brand make and model I always look for is FREE. Treadmills are one of those things people don't want to move because treadmills are big and heavy so people will give them away rather than deal with moving them. I picked up my first treadmill about 3 years ago and have scrapped 18 in that time. I have a search set up on Craigslist and Facebook market place. Every treadmill I have scrapped has been different. I never know what I am getting until I get it home and get into it. They all have good usable parts some are just better than others. If you can be patient and the treadmill is free you have nothing to loose. Thanks for the input!!
After following your channel for roughly 2 months, and building my 2 TM motor projects, I find the MC2100 option to be the least convenient and best chance for failure. FWIW, here is my little 8" drill press that was successfully modded with a TMM, but in that project, I had to make a whole new base out of 3mm steel just to house the MC2100 which is pretty inconvenient.
.....While constructing project #2 with my other TMM and MC2100, the MC2100 failed somewhere in it's circuitry. Originally, I thought the PWM gen died, so I bought another, and the faulty output continued which lead me to conclude that the MC2100 that I salvaged from someone else's garbage was itself garbage.
......Now I believe my drill press will one day fail at the MC2100, and I'll have to convert it to the SCR option. What's great about the SCR option is that I have been thoroughly familiarized with the entire circuit, so replacing any component will only cost roughly $30 if ever, plus also the 3 sizable components can be mounted where convenient and tied together with wiring. So the SCR is cheaper to construct/debug/fix, easier to mount, and if I understand your vids correctly, more robust in torque production.
www.thingiverse.com/thing:5512578
I would say there is a good chance your drill press will last a long time with the MC2100. While not being as robust as the SCR or Variac the MC2100 is by no means fragile (as long as you don't turn it on at full speed). The problem is you never know how many hours the board has on it before you scrapped the machine. Treadmills are one of those things that people use all the time or seldom if ever. You may scrap one and basically have like new components and scrap another that is at the end of its life. The other issue is storage. Because treadmills are big a lot of people store them in barns, sheds, or outside and that can also have an impact on their life. I am switching to the MC2100 on the bandsaw for starters because I need to replace the cheap "bump start" SCR but also so I can test the the tach input function on the mc2100. If the board fails I will upgrade to a good SCR but at least I will have gained the experience. A lot of people have left comments and swear by the MC2100 with tach input so I figured why not try it I have nothing to loose and knowledge to gain.
@@dazecars I'm having difficulty understanding how the 2100's tach will be used in our applications, especially if still using the PWM gen. On my drill press, I use a separate tach with display I bought from Amazon, so that I can see percentage displayed on the PWM gen as well as the RPM displayed on the Tach display, but if using the 2100's tach, how will you be able to visually appreciate what the RPM is? Or will it just help the 2100 operate smoother than it already does? One area the 2100 does shine is the motor is so so quiet regardless of the torque load I put on it.
@@MichaelJeffers75 I will use my handheld RPM meter to calibrate the system. Other than that I don't need an RPM display. I will make a chart that indicates what % duty cycle indicates what speed. The tach input on MC2100 is there to help maintain consistent speed. In theory having that input should result in very little speed change when a load is applied, but we will see if it actually works as advertised.
Too clever for me
But I still like it 👍
entertainment if nothing else 😁
you may find that you still have the original tac off some of your scraped treadmills. ive seen a magnet on the fan with a reader nearby or i have seen one as a encoder on the back of a motor as well
I have lots of them. I ended up putting the magnet on the fan (did the project last week for the upcoming video) this treadmill motor the shaft does not stick out the back of the case so there was no easy way for me to attach it.
Daze
Thank you so much for all the info.
I have a question I don't think you covered. That is what size circuit breaker to use?
I'm behind the curve with electronics and need a little help so I watch your videos very carefully often more than once. Your videos are , to me , the clearest and most competent I have found so far.
Good JOB!!!!
Jon
.
Glad, my videos helped!! There are amazon links to all the parts in the description.
@DazeCars - I got here because I was wondering about doing the same with me Bandsaw. Quick question before I go head first into a rabithole. Can you use something like a dimmer switch to control your built in motor? I have a hell of a bandsaw and I don't wish swap motors. I obviously know nothing about electricity an motors and I'm sure you'd have done something simpler if you could, but I figured I'd ask first
No you can not. First, most dimmer switches can not handle the high amps of a shop tool motor. They make a Router Variable Speed Control Dial that is sold by harbor freight and others and is designed to slow AC motors but you lose a ton of torque and using those sorts of limiting drives is very hard on AC motors. A lot of people have reported motor failure when using such a device. IMHO opinion there are only two options, a 3 phase AC motor with VFD or a DC motor with variable power supply.
I Need A Choke for my 125 Amp Welder. The Kind That You Wind 6 gauge wire around a 5 " Ferride Circle Core. How Do I Make This?
This is not exactly what you are after but it should give you some ideas ua-cam.com/video/sYjkQvUSths/v-deo.html a ferrite doughnut should be available on amazon or eBay
Hey buddy what do you think about a rc circuit for a scr. Because I got the same scr as you from Amazon and the motor bounces RPM at low speeds
I removed the RC circuits I originally had on my mill, lathe and bandsaw because it caused surging under a load
I need you to build one for my bandsaw or just go back to grinder
I bet you could do it. My videos walk you completely through it and I am happy to answer questions as they arise.
What about a big Variac and a Rectifier?
That’s an option that I go over in one of my other videos. ua-cam.com/video/AdGypyO_UuM/v-deo.html
I'm curious what you find out on the treadmill controller. I'm also curious how you are connecting and using the PWM input to control the speed. I am using one to drive a motor which in turn is driving a rotary table on my big mill. Someone looking at what I did to set my bandsaw up with the cheap SCR and bridge rectifier, noted I did not use a choke. He pointed me to your channel to l earn the value in using that. I really like what you're doing, and am upgrading my setup(s). So far, I've used these treadmill motors in my little Craftsman 618 lathe, 12" X 48" lathe, and Craftsman bandsaw. I actually stuck a magnetic tach in my bandsaw using 3 magnets that approximates the blade speed, not the rpm. It's not exactly accurate, but close. I may use an arduino to calculate it and accurately display it eventually, but for now it works okay for me. Glad I subscribed to your channel, as you are way ahead of me on the electronics stuff.
I am not quite sure what you are asking here " I'm also curious how you are connecting and using the PWM input to control the speed. " If it is how to hook up and use the PWM signal generator I cover that in my treadmill board video at about 6:20 ua-cam.com/video/RikeVYxITUQ/v-deo.html I am glad my videos are helpful. Please don't hesitate to reach out if you have any questions of if I can be of any other help
@@dazecars on the PWM controller, yes that's what I was asking. Thanks for the link. I really like those controllers, but had not considered putting one on the treadmill motor controller board externally. I had always just commandeered the treadmill controls to the controller board, but didn't like that I had to re-ramp the motor speed up every time I restarted it.
@@JohnnieBravo1 best way to eliminate the dreaded soft start 😁
Did you consider an AC-AC transformer w/ the original AC motor,
that is built for varying motor speeds? VEVOR 500VA Variable Transformer or similar?
Those controllers are a bad idea. The only GOOD AC motor speed controller is a VFD. The other options that slow motors, siginifcanly reduce torque and are very hard on the motor it self.
@@dazecars I figured that they were hard on the motors. Like everyone else, I need to slow down my band saw to cut steel.... so I'm looking at your videos to learn about treadmill motors, DC motors, etc.
Oh.... and why don't they have DC motors on even the cheap drill presses, given that their RPM ranges are easily between 200 and 4000 rpm's?
@@geek49203 Size and cost. An AC motor is cheaper to produce and there is no DC power supply required so another major cost savings.
@@geek49203 The treadmill motor is the way to go but it needs to be a good treadmill motor and it needs to be geared properly.
Hey - how does this compare to a 3-phase motor and a single-phase input VFD? I've just converted my drill press, and can't believe how well it works. Just surplus from Surplus Center online.
in quality there is no comparison. 3 phase and a VFD are the absolute BEST way to go BUT given the cost differences and how well a treadmill motor can be made to work when set up correctly the total value goes to the treadmill setup hands down and is good enough for most applications.
@@dazecars I'm looking on Surplus Center's site right now, and they have ~1HP right-angle gear reducers in 1:5; 1:10; 1:15, and higher for $146. Wondering about choosing the correct ratio model of something like these, and make a purely mechanical setup where a gear box can swap in/out by changing belts - direct drive for wood, as now, and through the reducer for metal - driving the same 4-step pulley for speed change.
Couple issues here. The problem you will run into with those gear boxes is most of them have a lower max RPM than what you will be dealing with. Treadmill motors are typically 3500-7000 RPM. Most of those gear boxes have a 1500 RPM max. And then wood vs metal you are over thinking it. When I set mine up the AC motor I removed was bout 1500 RPM, the motor I replaced it with was 4500 RPM so I geared it as close to 3:1 that way all I needed to do is simply adjust the speed to to the specific material I am cutting.
@@dazecars In this concept, I keep my existing motor - it's 1725 rpm, as is the gearbox maximum input speed - cool there. I think I'll go ahead and get a gearbox and play with it
that makes a whole lot more sense but seams like a lot of $$ for something that is not as user friendly in the end IMHO You can go treadmill for under $100 and then the only thing that ever needs to be changed is the speed
@@mccanlessdesign