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#11
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![]() No problem. It's a good way to upgrade band saws, drill presses, and other power tools to PWM-controlled DC power as well. Those things are rated to have humans running pushing against the bearings, they'll drill through things just fine. They usually have a speed controller board buried somewhere inside, usually near the motor. The units with push-button controls are harder to adapt, and there are a few old treadmills out there with AC motors and mechanical speed-change mechanisms.
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#12
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![]() Quote:
Cheers - Jim (aka - Jimmy)
__________________
Rebuilder's Zen Saying: One thought leads to another. If these thoughts link into a chain we become bound to the project. This bondage is subtle and remains until we complete the tasks -- or, STOP Thinking! [Only registered and activated users can see links. Click Here To Register...] |
#13
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#15
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![]() Pulled a motor out of a junked treadmill the other day. Two and a half horse DC motor. Hooked it up, and damn, the thing works.
[Only registered and activated users can see links. Click Here To Register...] I still need to figure out the belt drive setup yet. The treadmill had a flat multi-groove belt on it, while I'd like to just be able to use a Vee belt and some of the spare pulleys I have laying around to get the fan speed I want. [Only registered and activated users can see links. Click Here To Register...] Looks like a threaded 7/16 shaft that the flywheel/pulley assembly is threaded onto. I'm trying to decide what's the easiest/cheapest way to put a regular vee pulley on it. I got a few ideas, but I just gotta take a closer look at some available pulleys to see what makes the most sense. I've got the circuit board that controlled the motor speed (the control panel was digital, but I don't know yet if the signal to the motor board was analog or digital), and now I just gotta decide how much of it I want to use, and how much I want to bypass. I also need to decide the best/cheapest/decent-accuracy way to measure the fan RPM and the motor power consumption. |
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