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Polishing mineral glass with diamond paste.

vext01

By vext01
in Watch Repairs Help & Advice

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Graziano WRT Addict

Graziano

Posted
Posted

Hi there ,I have used diamond paste ,depending on how deep the scratches or damage is start with a course cut and a tiny bit of oil on a brass lap and work it in straight lines ,then clean off thoroughly and the lap before you step up to a finer cut .Then do the next cut at 90 degrees to the last one that way you can see the progress . go all the way to polish it .You can do this on sapphire crystal but it takes a lot longer . Sometimes it saves a lot of time to just buy a new one . Hope this helps 

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mikepilk Distinguished Member

mikepilk

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I have a Citizen Crystal Seven which had very deep scratches in the (very thick) glass. Wet and dry wasn't having much effect, so I used a 1000 grit diamond whetstone (plenty of water). It worked really well, then I moved on to diamond paste. 

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kozmo9000 New Member

kozmo9000

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Posted
On 3/5/2020 at 2:49 PM, mikepilk said:

I have a Citizen Crystal Seven which had very deep scratches in the (very thick) glass. Wet and dry wasn't having much effect, so I used a 1000 grit diamond whetstone (plenty of water). It worked really well, then I moved on to diamond paste. 

In what grit sequence did you put the paste?

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mikepilk Distinguished Member

mikepilk

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I bought a cheap set of pastes from ebay, they range from W40 (about 320 grit) to less than W1 (8000 grit).  I started with the W40 on a Dremel with hard felt disc.  Even the W40 didn't cut as much as I expected, which is why I used the diamond 'whetstone'. I think I then went to W20, W10, W5, W1. The end result looks good, but it's a lot more work than the few minutes it takes to polish acrylic.

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watchweasol Distinguished Member

watchweasol

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Posted

As explained by jdm  scratches in sapphire and glass take longer the remove as the material is harder and requirers a staged approach with finer grit and polishes to achieve the desired finish.  Acrylics are a differnt matter being easily polished with the likes of  Sovolautosol, brasso, toothpaste the usual household products  or the propritry branded polishes specific for the polishing of watch glasses..  A friend of mine who makes Glasses  used a several stage system using different grits/polishes done by machine to achieve the Optical range and desired polish. 

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