Grinder adapters for electric motor

[Gearhead00]

I recently picked up this 1 HP dual shaft craftsman motor to convert to a buffer/grinder.

It has 5/8ths shafts, and while I've been able to find the adapters with the left hand threads required for the left side shaft, I haven't been able to find the corresponding right hand threaded counterpart for the right side.

Can anyone point me in the right direction?

http://www.ebay.com/itm/Motor-Arbor...Male-USA-NEW-/321438011774?fromMakeTrack=true

 

[1/2 Cup]

I am not sure wether these are available in the states but most hardware stores out here stock these ones.

http://www.josco.com.au/newsite/jia/products/polishing/polishing_ts.htm

Regards

 

[zkling]

Do yourself a favor and buy a real, purpose built grinder.

 

[Gearhead00]

I have a bench grinder, mostly just looking to convert this to a polisher.

Is there any particular reason why this isn't a good idea?

 

[zkling]

I have a bench grinder, mostly just looking to convert this to a polisher.

Is there any particular reason why this isn't a good idea?

Speed, short shaft length, open ends allow abrasive grit in. Hard to get a solid mount without inducing run out and vibrations. That would be a great table saw, jointer or even drill press motor. If you have a belt driven buffing shaft, it would work pretty good, but not as a direct mount.

 

[BlackjackNA]

And I have the same problem.... I gixmo'd a couple small pulleys on either side oof a large cutting blade.... I can't succeed in getting the disk centered... therefore, it makes cutting almost impossible.... Since I'm a lil stubborn, I've been doing same: looking for a proper adapter, or mcgiverring up something that works.

 

[Kenwc]

I've done this for years with great success using dual and even single shaft 1725 RPM motors....with wire wheels, buffing wheels etc..

The part you're looking for is called a "work arbor" or "arbor adapter" search on that and you'll find sources. You'll need one with left hand thread and another with right hand threads.

Mcmaster Carr has them and so does Eastwood.

 

[BlackjackNA]

Perfect - will letcha know how I make out...

 

[jakemac]

BTDT

I used a 1750rpm motor to make a wire wheel stand, and a 3450rpm motor to make a polisher.

The wire wheel is perfect and gets used a lot. The polisher is iffy. It has a tendancy to travel across the floor. Part of that is the inherent imbalance in the pads (3x 3/4" pads each side). But I think another part of the problem is that I cheaped out on the arbor adaptors. I'm wondering if I should swap it out for a 1750rpm motor, but I haven't decided yet.

Originally, I ordered some cheap adaptors from ebay (both RH thread). DON'T WASTE THE MONEY ! Aside from having to use a double nut on the left side to keep the wheels on, only 1 of 4 adaptors I bought were true enough to use. And only just barely.

I ended up ordering a new set of adaptors from Zoro Tools. They were a little more expensive, but run truer and come in LH and RH threads. They also sell longer shanks if you like. I also used a bronze bushing over the unused threads to space the pads out to the end of the arbor.

These are the part numbers I ordered for the 1/2" shaft motors I used.
G1730032
G1213371

The first posts in my project thread (in my signature) detail some of what I did to build my wire wheel.

 

[Abj87]

Grinders need a steady rest, and a guard.

That should only be used as a buffer.

 

[jakemac]

Good point, I didn't catch the grinder bit I only saw that he wanted a polisher.

Gearhead - put a wire wheel on one side and a polishing pad on the other side. Leave the grinding stones on a dedicated grinder.