AC Small Motor Speed Control
AC Small Motor Speed Control
(OP)
This should be easy for you guys.
I have a small Coweco coil winding machine powered by a 1/10 HP Bodine AC motor. I bought this machine used (vintage '67) and its speed control pot had been removed. I bought a simple foot pedal speed control from McMaster-Carr which works quite well but I'd rather mount the speed control back on the machine panel and run it "foot" free.
What kind of potentiometer should I buy and where can I get it? The foot controller has this little sealed long throw button do-hicky inside rated at 6 amps 125V called a "bi-rstor" with terminals for line and load.
Thanks in advance.
Fred
I have a small Coweco coil winding machine powered by a 1/10 HP Bodine AC motor. I bought this machine used (vintage '67) and its speed control pot had been removed. I bought a simple foot pedal speed control from McMaster-Carr which works quite well but I'd rather mount the speed control back on the machine panel and run it "foot" free.
What kind of potentiometer should I buy and where can I get it? The foot controller has this little sealed long throw button do-hicky inside rated at 6 amps 125V called a "bi-rstor" with terminals for line and load.
Thanks in advance.
Fred





RE: AC Small Motor Speed Control
RE: AC Small Motor Speed Control
RE: AC Small Motor Speed Control
Yes. Very much like a sewing machine! Kinda sounds like one too.
Coweco went out of business years ago. I found a wiring schematic that shows a 1 meg. variable resistor. The foot pedal mfg has very little data. They just specified it as a fractional HP speed controler.
All I can say:
1/10 HP AC motor
single phase
6 amp speed control foot pedal with source voltage running through it. (works well)
Schematic shows 1 meg variable resistor used originaly.
I was hoping this would be simple. I'm looking in my Mouser catalog and wire wound pots have power ratings in watts @ deg C....what's that in voltage?
I guess I'll be needing a single turn, wire wound pot. Conductive plastic?
Here's another thing (bare with me this is not my field of expertise) The schematic also shows a speed controller unit with 6 terminals and wires attached going every which-a-way. One is going to the pot and one returning from it back to the controller. I get the feeling that all of this has been bypassed and the foot controller is feeding power straight to the motor. I could be wrong...
Looking at the unit itself I don't think I see a speed controller. There is a a relay unit with switches and a coil then a terminal strip with more wiring I don't understand. A few resistors and a couple of capacitors but not much else in the way of "controllers".
Thanks to anybody who is still reading this.
I really need to get this thing sorted out because there is also an auto shut-off (mechanical switch) after a specified # or revs, that's not getting it's message across to the relay. This is a different problem all together. I don't even have a clue where to take it to get fixed if I can't get it sorted out here.
Maybe a sewing machine repair shop?
Thanks again for your help and patience.
Fred.
RE: AC Small Motor Speed Control
RE: AC Small Motor Speed Control
Thanks Operahouse.
I just saw it on the Harbor Freight web catalog.
That looks perfect!
Have a wonderful holiday.
Fred.
RE: AC Small Motor Speed Control
The above referenced "Router Speed Control" is for AC/DC brush type motor. Visit
http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?i...
for the "Router Speed Control" limitation.
It may be a good idea to bring the schematic to an electronic technician or engineer to review it before anything is purchased.
RE: AC Small Motor Speed Control
Yes, the motor is an old AC, 1.5 amp, 10K RPM Bodine Electric Co. brush type motor. If this foot controller I bought works, then the router speed controller should work. Right? Hope so. For less than $20 it's worth a try. I'd like to remove the innards and mount them to the machine chasis with the pot where the old one was supposed to be. I may have somebody review the schematic before I try anything in though.
Thanks again.
Fred.
RE: AC Small Motor Speed Control
http://www.bodine-electric.com/
tech support
RE: AC Small Motor Speed Control
Thanks very much.
Fred.