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dinontom
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Polish/Grinding abrasives - choosing right stuf
Dec 3rd, 2013 at 6:50am
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My father had some hidden lapidary stuff that I just found last night.  he has boxes of "Polishing Disks" that are paper backed and vary in surface texture from that of a heavy linen paper to a denim like feel.

In addition, he had MANY boxes of Silica Carbide discs (textile backed) that seem to go on a grinding/polishing disk, but that do not have an adhesive or knap to affix to the disk.

Lastly, I found 2 brand new diamond grinding/polishing disks.  These have abrasive on only one side, with the other just bare metal.

Can you guys tell me what I have, how I should best make use of them?  Also, is Silica Carbide an appropriate abrasive for polishing stones, mostly Silica based agates and Chert?

Thank you all very much for the help.  I am new around here and I like to ask questions, so please just bear with me and I promise I will bear some good fruit, God willing that is.
  
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Scott LaBorde
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Re: Polish/Grinding abrasives - choosing right stuf
Reply #1 - Dec 3rd, 2013 at 1:50pm
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First you will have to determine the diameter of those polishing disks.  Once you know that you will be able to search for a unit that is capable of using it.  Even if it doesn't fit and the disks are small enough you can usually buy spacers that will allow it to attach to about any polishing unit, be it turn table style or the vertical style.

It would help to know what grit those diamond disks are.  If you can approximate the relative grit texture compared to sand paper grit then you get a rough approximate diamond grit number.  But it may be difficult to do unless you have the available and labeled grits already in hand for comparison.
  

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Re: Polish/Grinding abrasives - choosing right stuf
Reply #2 - Dec 3rd, 2013 at 2:08pm
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The diamond disks are 8" diameter with a 1" arbor. 

The grit are a 220 mesh (64-74 micron) & the other is (30 micron). 
  

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Scott LaBorde
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Re: Polish/Grinding abrasives - choosing right stuf
Reply #3 - Dec 3rd, 2013 at 2:22pm
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Yes, 220 is pretty rough and would be used mostly to shape the stone.
  

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JoeM
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Re: Polish/Grinding abrasives - choosing right stuf
Reply #4 - Dec 3rd, 2013 at 9:29pm
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No telling if those discs are for a flat lap for making cabochons or a faceting machine.
You didn't see any old machines around did you?
  
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