Forums Polishing Beginner question

4 replies, 4 voices Last updated by  gemmakermz 1 month ago
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  • Author
    Posts
  • #5335

    johnv
    Participant
    @JohnV

    Can I use a steel master lap for final polishing, and if yes how do I set it up

    #5336

    johnv
    Participant
    @JohnV

    correction aluminum master lap

    #5337

    Alan Balmer
    Keymaster
    @alanbalmer

    A master lap is intended only to support other laps. It’s useful for toppers and polishing films, but not suitable for cutting or polishing by itself.

    #5338

    Rick_Brooker
    Participant
    @Rick_Brooker

    If you want to use the aluminum master lap for final polish, you can use a dynalap. They come in many different grits, the blue spectra lap is popular for that. The downside is that it can cause rounded edges on the facets.

    #5554

    gemmakermz
    Participant
    @gemmakermz

    your best bet is to find an affordable clean tin surface lap. use 50,000 grit diamond powder– no oils– just clean water at a VERY SLOW drip and lap speed very slow too. oil is a lubricant, use water which is a wetting agent and try to create a muddy slur. the diamond powder will charge into the tin lap as being used which prolongs the polishing, you’ll generally feel a small drag action when polishing. i have a 13 yr old girl student that it doing GREAT and great polish on all her different materials stones. she’s just been written up in the september 2019 issue of rocks and gems magazine. she is a junior in the lakeside gem and mineral club of kennewick wa.. i’ve tried zink, lead and other metal laps for polishing and unless your cutting a diamond you can’t beat a good tin lap and 50,000 diamond powder.

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