A quick eBay search revealed this one:Have you got a treadmill motor eyed up? Ive got all sorts if ya need one.
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www.ebay.ca
A quick eBay search revealed this one:Have you got a treadmill motor eyed up? Ive got all sorts if ya need one.
That's the setup I have on my larger CNC engraver. DC motor, KBB driver and PWM output from an Arduino GRBL controller. Works flawlessly.Part of my planned conversion is a swap of the BLDC spindle motor to enable control of the motor via the controller interface.
The servos that I bought in the kit are DMM so I looked at a DMM 1.8 HP AC servo and driver. North of $1000 USD is too expensive for my blood.
I can get a no-name AC servo and driver off eBay for about $750 CDN which is a bit more palatable but still expensive. And the sketchy documentation, tuning software is not great.
I considered an AC motor and VFD but the motors in the 1.5 HP range are heavy beasts and I'm not keen on putting that much weight on the head of my bench mill.
Ran across a lathe CNC conversion that used a 90V DC treadmill motor with a KBB driver that uses a potentiometer to control speed. The conversion I saw used a board to take a PWM signal from the CNC controller as input to the KBB driver board allowing full control of rpm and direction of the DC motor.
KBB board:
eMotors Direct - Canada's Online Source for Electric Motors, Gearing, and Controls
www.emotorsdirect.ca
PWM control board:
So a completely viable idea. OK that's encouraging.That's the setup I have on my larger CNC engraver. DC motor, KBB driver and PWM output from an Arduino GRBL controller. Works flawlessly.
Not sure about $100 for a treadmill motor, there's probably a couple of dozen treadmills for $25 or less on Marketplace VictoriaA quick eBay search revealed this one:
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There are some free ones but I don't really feel like dealing wit ripping it apart and then having to dispose of the remains.Not sure about $100 for a treadmill motor, there's probably a couple of dozen treadmills for $25 or less on Marketplace Victoria
I love that! Very clever and now you have got me thinking about my own bandsaw...And if you want a truly bizarre example, my 1936 Cratfsman bandsaw has two motors - 3/4 HP 120vac 1750 RPM fixed speed, and a 90 VDC treadmill motor with KBB controller. No pwm, I just use a pot for speed control. Treadmill drive belt and pulley connected to AC motor. One end of AC motor drive shaft connects to the treadmill motor, other end has the pulley to drive the bandsaw input pulley. Interlock so AC motor and treadmill motor can't be powered at the same time. Simple sliding tensioner on the treadmill pulley so If I want to use the AC motor I just pop off the treadmill drive belt.
Variable speed works great for cutting metal.
Custom Staples office tray belt guard.
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Ya I collect em. Pull the driver board when I do. They vary in diameter from about 3-5 inches, may or may not have cooling fans on one or both sides of the shaft and may or may not have a rotary encoder or rpm sensor.Not sure about $100 for a treadmill motor, there's probably a couple of dozen treadmills for $25 or less on Marketplace Victoria
These ones look promising.Ya I collect em. Pull the driver board when I do. They vary in diameter from about 3-5 inches, may or may not have cooling fans on one or both sides of the shaft and may or may not have a rotary encoder or rpm sensor.
That ones nice, no fans and a wheel encoder, about 4 dia.
Heres a couple smaller ones approaching 3" dia, no fans
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They more often have fans
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I hit up the dump or buddies when throwing them out or see em for free. Recently stopped collecting because i have far too many. Also have a few incline motors. Cost of shipping and you can have your pick.
12492 is 3.170 dia body, the mount bracker is spotted to the body. Dimensions in picturesThese ones look promising.
Particularly the silver one, stamped 12492.
I would need to see the shaft end of the other two if you have pics.
That's great!12492 is 3.170 dia body, the mount bracker is spotted to the body. Dimensions in pictures
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1/2-13 LH one shaft. The others Id need to pop the flywheels, I can do that tomorrow for ya, are there specifics youre after? I think threads are usually LH...
They need extra cooling consideration when run lower. Davids gonna do some homebrew water cooling though I bet. 300rpm for 8 hours straight might cook it. Gearing down would help/alleviate. Something to think about.Only big concern is the treadmill motors tend to be higher rpm than ac motors, so you need to consider this when setting up the drivetrain.
The "peak" hp is bs on these, thats with the flywheel somehow. Ill poke around a bit.That's great!
Basically looking for minimum 1.5 HP, 2 is better.
Longer, larger diameter shaft for ease of adapting.
I'd probably make an aluminum 'can' for the shaft end to drop into for mounting purposes so a round housing is ideal but the spot welded bracket could probably be dealt with.
I figured the HP rating's were like like Craftsman 5hp shop vacsThe "peak" hp is bs on these, thats with the flywheel somehow. Ill poke around a bit.
I'll wrap copper tubing around the motor and circulate coolant through itThey need extra cooling consideration when run lower. Davids gonna do some homebrew water cooling though I bet. 300rpm for 8 hours straight might cook it. Gearing down would help/alleviate. Something to think about.
I pull the motor, belts, tread and boards, then I cut the old tread belts up and cut to size and glue onto top of storage cabinets.There are some free ones but I don't really feel like dealing wit ripping it apart and then having to dispose of the remains.
Though the belting could be useful... hmmm
Unfortunately we don't have friendly neighbourhood scrappers.... that means I take the rest of it to the recyclersI pull the motor, belts, tread and boards, then I cut the old tread belts up and cut to size and glue onto top of storage cabinets.
Then I dump everything else by the curb and the friendly neighbourhood scrappers take care of the rest