Can I reverse any motor's direction?

Matt Rochester

Matt Rochester

Joined
Nov 28, 2014
Messages
1,864
I am wanting to build a disc grinder and have 2 motors. I have heard I can disconnect the start capacitor and spin it the direction I want it to go before starting. Anyone know if this is correct and how to do it?
 
Speaking motors the term you are looking for is rotation.Reverse or forward rotation in term of the load on drive end.Yes you can tell me what kind of motor it is and I can tell you how. I'm assuming you're motor is capacitor start since you mentioned capacitor?I'm assuming it's a alternating current motor , single phase.if you're not certain send me a picture of the name plate. Do you want to be able to change the rotation from a switch?

cheers

grumpy_grinder ... you're not so friendly industrial electrician and automation technologist
 
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I'm just assuming it is. This is what I have. I would rather have a variable speed but I already have a motor so this is what I'm going to use if it will work. Doing it with a switch would be awesome. Excuse the terminology as I am a mechanic. It bothers me also to hear folks use the wrong terminology!
 
matt can you text me? I promise not to secretly save you're number and text you when i'm drunk and need a friend.
 
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i will send you the motor print with the opp and std for high and low and walk you throug connecting it if you need help. Very simple ... as easy as interchanging 2 wires :rolleyes:
 
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Matt, be sure you know the shaft size before you order the disc. Beaumont's disc calls for a 5/8" shaft. You may already know this, just thought I'd mention it.
 
it's canadian eh , faster and more simple to do over text. for me anyways if you're phone plan allows it
 
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I have found some shop smith 12" disc for $50 new. I'm not sure if they are tapered and I would have to drill them to 7/8".
 
A 12" disc is not practical. Go to 9" and you will be able to buy standard size sheets to fit. Trying to work on a disk that runs only full speed is a real tough job to do well.
Frank
 
Matt R said:
I have found some shop smith 12" disc for $50 new. I'm not sure if they are tapered and I would have to drill them to 7/8".
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I think it would also need to be broached for the keyway. Most people can't do this in their shops.
 
ron_m80 said:
I think it would also need to be broached for the keyway. Most people can't do this in their shops.
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Not necessarily. I think the shopsmith disc has a set screw tapped into the shaft hole. You could add another one or two if necessary (probably wouldn't be), or grind a small flat on the top of the motor shaft.
 
If you go with the 12" shopsmith disks, do yourself a favor and have them bored out by a machinist who has a lathe and the proper tooling.

I can say from some experience that the odds of getting a perfectly centered and perpendicular hole using a twist drill on the drill press are small, and a little run-out will end up being a lot of wobble at the edge of a 12" disk.
 
Mahoney said:
If you go with the 12" shopsmith disks, do yourself a favor and have them bored out by a machinist who has a lathe and the proper tooling.

I can say from some experience that the odds of getting a perfectly centered and perpendicular hole using a twist drill on the drill press are small, and a little run-out will end up being a lot of wobble at the edge of a 12" disk.
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And while they're chucked up in the lathe, have your machinist knock about 3" off the outer diameter. As has been stated, you can then use common (and much cheaper) sheet paper trimmed to fit. Otherwise, you'll be spending way more in the long run on 12" disc paper than you ever would have on a decent set of 9" discs.
 
If I'm going to do all that to a shop smith then I'm just going to get the tapered Beaumont for $90. Thanks.
 
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