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  #26  
Old 03-20-2018, 01:49 AM
Chris Lowry Chris Lowry is offline
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No no... I donít really have much of a budget just want to know what the best is and then figure out what I can afford.

I like all the ideas...

Thanks
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  #27  
Old 03-20-2018, 01:59 AM
Chris Lowry Chris Lowry is offline
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I had no idea what a levagator was... but cool tool. Could you motorize a levagator? What about a random orbital levagator?
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  #28  
Old 03-20-2018, 08:33 AM
Marc Carmen Marc Carmen is offline
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I've wondered about building a motorized one. Like an upside down lap wheel. If you did motorize it then slow rotaion would be the key. Its surprising how fast you can turn one by hand and when you start going finer than 320 grit the higher rpm's cause scratches.

Not sure about random orbital stuff but it doesn't seem like the stone guys use anything like that. Next time I have a large flat panel to take to a polish my plan is get it flattened by a stone shop like the vid Eben posted, levigate from 80-400 grit, then polish the rest with a wet polisher. Not sure if that's the easiest way to do it. The process will humble the best coldworkers
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  #29  
Old 03-20-2018, 08:37 AM
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Just mount stones on a Roomba 680
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  #30  
Old 03-20-2018, 08:57 AM
John Riepma John Riepma is offline
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The name for the machine is a radial arm polisher. I saw one being used in Portland at the 2008 GAS conference to grind and polish large cast slabs that they were doing for various artists and architectural installations. Here's a link to one on Ebay:

https://www.ebay.com/itm/Midas-Helpe...0AAOSwf15af12k

This is just FYI, I have no connection to the party selling this machine.
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  #31  
Old 03-20-2018, 08:59 AM
John Riepma John Riepma is offline
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And here's a YouTube link to a larger one being used:

https://www.youtube.com/watch?v=mQIZC25FLiE
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  #32  
Old 03-20-2018, 01:49 PM
Chris Lowry Chris Lowry is offline
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I really like the idea of a radial arm polisher, seems like you could attach just about anything to it and it would help keep it flat. I how flat you could reall keep things.

Iím a little lucky on my wifeís pieces... as of right now we are only taking them to 220 grit and then firing them to a satin surface. No need for a complete polish. Of course that will probably change some day.
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  #33  
Old 03-20-2018, 02:52 PM
Eben Horton Eben Horton is online now
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If I had the time and the need,Iíd just build a radial arm polisher out of parts obtained from granger/ McMaster Carr and where ever else. Then cobble something together that utilizes the workings of something that is much like the wheel grinders we build with a Dayton motor, controls and a water feeed. Itís not rocket science.
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  #34  
Old 03-20-2018, 06:46 PM
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you need real bearings. Precision makes this work, or fail.
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  #35  
Old 03-20-2018, 08:01 PM
Marc Carmen Marc Carmen is offline
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Just went into a youtube hole of watching radial arm polishers run while dreaming of building one. Really though it seems like a machine that would never pay for itself or justify the shop floor space it takes up unless polished slabs is all you make. This is the kind of work you can just sub out too. Then again it would be cool to have that long arm reach over to surface grind your lap wheel... and then reach into the hotshop to resurface your marver : )
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  #36  
Old 11-23-2018, 11:37 AM
Marcel Braun Marcel Braun is offline
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Quote:
Originally Posted by Eben Horton View Post
This made me think.....there are TONS of giant old drill presses ou there that look just like that grinder. cant remember the name but Ive been offered 2 for almost free at this point just from being around the fabrication world. Maybe something like that could be adapted.
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  #37  
Old 11-23-2018, 12:18 PM
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Watching David's machine at work, I noticed all of the storm drains around the machine and I'm quite sure it takes a lot of water to run that. If I recall correctly, The City of Portland did not take kindly to the stuff bullseye was allowing in those drains.
Glass paste really behaves quite like concrete.

I did use a bridgeport for some time to do radial cuts into Schott optical glass and the paste buildup was alarming.
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