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Surprise benefit of Reverse Sanding on lathe (PowerPro)

Posted: Thu May 12, 2011 6:19 pm
by nuhobby
Truth be told I've found several uses for the pen-turning mandrel. It's always nice to have the stability of the workpiece between 2 centers.

I recently had a surprise benefit from the reverse-sanding capability of the PowerPro. I was fixing an antique turned knob for a repair job.

During turning, the establishment of the wood's "center" can be arbitrary at the beginning, but then you're best off to keep it consistent for the whole job. As such, when I noticed that my glued-on repair-piece was getting better-sanded on the "leading edge" than the "lagging edge," it occurred to me to try the Reverse rather than changing my mandrel setup. This worked like a charm -- to feather the other glue-joint edge without excessively sanding the first edge.
:)


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Posted: Thu May 12, 2011 8:03 pm
by stockew
Nicely done. It's amazing how we can creatively adapt capabilities to these types of unusual circumstances. You pointed out the reverse ops of the Power Pro that enabled you to do this. I was looking at YOUTUBE videos last night and ran across a SS forum member "ddvann" proudly showing his restored SS Goldie. What I found interesting at one point in the video was that he had another forum member (Bill Mayo) re-work the headstock, at which time he had installed a motor-reversing switch to the headstock. Something I personally have not seen discussed in the SS forum.

http://www.youtube.com/watch?v=dMkL5_KU9zY

Posted: Thu May 12, 2011 10:26 pm
by jcraigie
Bill is an amazing guy, he does outstanding work and is always willing to help out answering questions. I would recommend him for any work you don't want to do yourself and he's a great go to guy for questions. (even ones that I thought were kind if silly)

Posted: Thu May 12, 2011 10:35 pm
by stockew
Maybe we could get a schematic of the motor-reversing electrical set up.....??!! :-)

Posted: Fri May 13, 2011 1:48 am
by JPG
stockew wrote:Maybe we could get a schematic of the motor-reversing electrical set up.....??!! :-)

The motor must be constructed(wired) such that you can isolate the start winding from the run windings. Not always are they accessible.

Modifying involves disconnecting existing internal windings from wires that exit the motor, and re wiring. The start winding must be isolated from the run windings. Then it is merely a matter of reversing polarity of the start winding wiring.

The attached files have been reduced to get them to upload. PM me with an e-mail address and I will send a full sized pdf.

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Continued...

rewiring a 3/4 hp GE motor to reverse with dual voltage

Posted: Fri May 13, 2011 1:52 am
by JPG
continuing...

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Posted: Fri May 13, 2011 7:37 am
by pennview
JPG, thanks for posting this information.

Does this same procedure apply to the 1 1/8 HP motor??

Posted: Fri May 13, 2011 8:47 am
by billmayo
pennview wrote:JPG, thanks for posting this information.

Does this same procedure apply to the 1 1/8 HP motor??
The reversing modification can be done to the GE and AO Smith 1 1/8 HP motors. The Emerson motor internal coil wires are not accessable.

Re: Surprise benefit of Reverse Sanding on lathe (PowerPro)

Posted: Wed May 06, 2015 4:56 pm
by 5speedsoffury
Hello, I'm new to the forum and in the final stages of fixing up my greenie. I have made it this far on the wiring but would like to have the motor direction controlled by a switch. I have a 6 terminal DPDT on off on toggle switch for controlling the direction and a 4 terminal SPDT on off switch for power. So my question is how to wire them up?! I can post pictures if need be and I can also understand just a picture showing the wiring if somebody could help out I would greatly appreciate it!

Re: Surprise benefit of Reverse Sanding on lathe (PowerPro)

Posted: Wed May 06, 2015 6:25 pm
by JPG
It will involve cutting existing internal splices and bringing extra wires out of the motor for attachment to the reversing switch. If you feel up to that holler!

I assume you have a GE motor. Depending upon its age, it may have a different brand motor. Check it out.