Astrophotography forum > ATM, Optics and DIY Forum

Motorized turntable for grinding

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Anthony Graham:
One of the big problems with my (sadly incomplete and ruined) 6" mirror project was that I have a small garage and there's barely enough room to walk around my grinding stand. I would like to make a motorized turntable so that I can sit/stand in one place while grinding/polishing. I'm not looking for a Mirror O Matic, just a turntable that spins on its own - kind of like what Gordon Waite uses in many of his mirror making videos.

Does anyone know of any design plans or commercial products I could use for this?

Jay Garcia:
You might want to look at a "potters wheel". Motorized or manual...manual would most likely be cheaper and IMO would probably work fine.

Look at Craig's list obviously. Also look up some local art/pottery supply places in your area and ask them. Heck, might get lucky and someone might loan you one or let you come over and use theirs.

PS, don't do anything...and certainly don't buy anything without getting plenty of input from the folks here! You certainly don't want more problems with this project and your parents getting even more gruff about the whole thing.

PPS. Building a turn table SOUNDS easy and cheap....but unless you find some EXACT plans that lay down the EXACT parts and the EXACT total cost and EXACTLY how it goes together I would avoid that. DIY builds of any nature tend to be a lot harder and costlier in practice than in theory.

Which reminds me of a favorite phrase:

In theory there is no difference between theory and practice but in practice there is.


--- Quote ---(sadly incomplete and ruined) 6" mirror project

--- End quote ---

I don't believe that your 6" is ruined!

What about a "Lazy Susan" ?
Forget the motors, keep things simple.

A customized simple Lazy Susan for mirror grinding can be build from a sturdy round disk made from plywood + some roller-skate wheels (or similar) put up-side down on a table below. Some kind of vertical axis through a hole in the table and fixed to the underside of the disk to keep it in place.
Simple, easy and cheep to build

Larry Hopkins:
Good idea lars.

Or for that matter just buy a large lazy susan bearing at the hardware store.

Tyler Cox:
Hmm. Potter's wheels are expensive (a couple hundred bucks). Think I'll just use a Lazy Susan for now.

Thanks guys!


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