Winner Home Grown Cutter Grinder

[Bill Gruby]

I don't have the motor yet. I deleted the post and will add the diagram to this post with wire colors.

"Billy G"

 

[John Hasler]

Looks OK. Smoke test it. )

No, don't do that. The diagram is almost certainly wrong. To reverse a single phase induction motor you must reverse one of the windings. This requires a DPDT switch or relay. Here is a link: http://www.chainganger.co.uk/Page1/PDF/Reverser.pdf

 

[Bill Gruby]

S1 is a DPDT switch. S2 is a SPST.

"Billy G"

 

[John Hasler]

S1 is a DPDT switch. S2 is a SPST.

"Billy G"

You've shown SPDT for S1.

Basically, to reverse the motor you must swap one of the windings end-for-end. The capacitor(s) must be in series with the aux winding. If the capacitor(s) are internal to the motor you can ignore them. On a reversible motor there is usually a diagram on the nameplate or junction box showing how to hook it up for each direction.

 

[Bill Gruby]

Do I really need the ability to reverse the direction of the motor for this application?

"Billy G"

 

[Bill Gruby]

Working up the lower set of binders.

"Billy G"

 

[DMS]

I think S1, is a momentary switch to start up the motor (switches in/out the capactor).

 

[John Hasler]

Do I really need the ability to reverse the direction of the motor for this application?

"Billy G"

I can't think of any reason, but you're the machinist. I'm just an electrical engineer with a garage full of junk.

 

[Bill Gruby]

When grinding you need to push down on the cutter with the wheel. This stops the wheel from pushing the cutter up and out of the wheel. That would be a bad thing. Any other thoughts on this issue?

"Billy G"

 

[David Kirtley]

If you are going to the trouble of building from scratch, wouldn't it be nice to add speed adjustment? Even with a grinder, you can hit those resonant frequencies and being able to tune them out is a nice feature.