AGTA TUCSON GEM AND MINERAL SHOW: FEBRUARY 4-9 2020
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 Post subject: Re: polishing
PostPosted: Thu Nov 15, 2018 5:48 am 
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j.mcgee_1985 wrote:
I was ordering a couple more dops from graves and saw those, I thought it was worth a shot for 17 dollars so I ordered the multi pack. I also just got my cerium oxide so I'll have to get one of the batt laps too.


If you use oxides I would rather recommend a Matrix than a Batt. I must admit I never used a Batt but I am happy with my Matrix.

Martin


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 Post subject: Re: polishing
PostPosted: Fri Nov 16, 2018 2:27 am 
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I just ordered one from graves, thank you for the recommendation Martin. What grit do you use for pre-polish? The highest I have right now is 800.


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 Post subject: Re: polishing
PostPosted: Fri Nov 16, 2018 3:23 am 
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How do you choose what shape to cut a stone into? I get that you have to take inclusions and original shape and weight into consideration but are there better shapes for certain gem types or does it just depend?
Also how do you choose the correct dop size? The stone should hang over the edge enough to cut the girdle but not so much that the stone can be pulled off while grinding?


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 Post subject: Re: polishing
PostPosted: Fri Nov 16, 2018 4:14 am 
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800 ist too coarse for a pre polish. I do my pre polish on a Zinc+ Lap also from Gearloose and his 8000 diamond stick.

The dop always has to be smaller than what the stone will finally be and as a Newbe count on the stone to become smaller than you thought just by correcting mistakes.

I use wax for doping and super glue after the transfer. I put some wax on the dop I want to transfer then press the stone into it to get the shape into the dop, then lift it again, put some superglue on the wax and lower the stone again. Wait for the glue to settle. Works for me but you will find loads of doping tricks on the net.

Martin


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 Post subject: Re: polishing
PostPosted: Fri Nov 16, 2018 9:16 am 
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1200 is fine for a prepolish, I go straight from 1200 to the ultralap and it looks great.

Jim


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 Post subject: Re: polishing
PostPosted: Fri Nov 16, 2018 10:41 am 
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Thank you guys!


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 Post subject: Re: polishing
PostPosted: Fri Nov 16, 2018 1:42 pm 
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Well I just screwed up my first stone.. Thought I had enough of an over hang from the dop but just like you said Martin I went to do the girdle and its all lining up perfect then I get to the side I thought I had enough on but I didn't. Ground into the dop and it was done from there. I'm soaking it now so I can epoxy it to a smaller dop tonight. Bleh, half the stone looked so good and then it all just got screwed up. I think if I had started the girdle on the side with the least hanging over it might have been ok but since I started on the meatier side I took it up too far. Lesson learned.


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 Post subject: Re: polishing
PostPosted: Sat Nov 17, 2018 4:17 pm 
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Instead of soaking the stone and dop, try just heating the dop up, and the epoxy will loose it's grip and you can pull the stone off. Takes 2 minutes rather than a few hours or overnight.

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 Post subject: Re: polishing
PostPosted: Sat Nov 17, 2018 4:35 pm 
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I will try that, thank you.


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 Post subject: Re: polishing
PostPosted: Tue Nov 20, 2018 5:06 am 
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Do you guys ever order from Graves? I've ordered 3 times the first time I was missing one dop, the second time another dop and my ultra laps and I paid 40 dollars for 2 day shipping on the third that was 5 days ago... Eventually I'll get the laps and those are the only ones I need now but I still need a lot more dops, where do you guys get yours from?


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 Post subject: Re: polishing
PostPosted: Tue Nov 20, 2018 5:14 am 
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Do a quick forums search on Graves and you will quickly notice a pattern on peoples' experiences with them the last few years.

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 Post subject: Re: polishing
PostPosted: Tue Nov 20, 2018 11:36 am 
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j.mcgee_1985 wrote:
Do you guys ever order from Graves? I've ordered 3 times the first time I was missing one dop, the second time another dop and my ultra laps and I paid 40 dollars for 2 day shipping on the third that was 5 days ago... Eventually I'll get the laps and those are the only ones I need now but I still need a lot more dops, where do you guys get yours from?

I wonder if Graves will be around in six months.

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 Post subject: Re: polishing
PostPosted: Wed Nov 21, 2018 3:25 am 
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I should have searched before I purchased #-o . Hopefully they stay around long enough for me to get my stuff.. That matrix lap wasn't cheap.


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 Post subject: Re: polishing
PostPosted: Wed Nov 21, 2018 11:59 am 
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You can get Gearloose products directly from the source, https://gearloose.co/ . Usually ships very quickly.


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 Post subject: Re: polishing
PostPosted: Wed Nov 21, 2018 4:21 pm 
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I'll start using them from now on, thank you.


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