Australian Facetors' Guild Limited

Plumbing Gemmasta Gf3

  • 05 Dec 2019 10:12 AM
    Message # 8179311

    I have just bought a GF3 and i want to plumb it . It does not have a half round dop and the cheater has only one set of numbers 0-5 -0

    do they have a half round dop stick

  • 06 Dec 2019 6:33 AM
    Reply # 8187945 on 8179311

    Where do you live, Hugh?

  • 06 Dec 2019 9:03 AM
    Reply # 8188909 on 8179311
    Anonymous member (Administrator)

    The knob that is numbered 5-0-5 is not the cheater, it is the angle splitter with each division being 0.1 degree, i.e. 0.5 degree up, or down from the 0 position.

    The cheater is the unit behind the index wheel, with scales reading from 0 in both clockwise and anticlockwise divisions. When it is on 00, make sure that the pawl is centrally positioned on the threaded section - it can be on 00 when it is as much as 2 full turns left, or right.

    Contact Gemcuts at Ballina for a half round dop - they have taken over Gemmasta manufacture.

    Last modified: 06 Dec 2019 9:05 AM | Anonymous member (Administrator)
  • 07 Dec 2019 4:28 PM
    Reply # 8201797 on 8179311

    Thanks John and Bruce

    I live in Orange and belong to the lapidary club there . Our Member who teachers faceting said iam the only one in orange who has a Gemmasta. The club has two Halls machines

    I would appreciate any Info on the machine .

    Please excuse my ignorance. I found the cheater as stated. I found the 00 line up on an adjacent mark. What is the pawl ?

    Thanks I will contact Gemcuts

  • 10 Dec 2019 9:24 PM
    Reply # 8233397 on 8179311

    Hi Hugh

    If you go to this link you can download a comprehensive manual on how to align a Gemmasta complete with pictures.;sa=view;down=7

  • 11 Dec 2019 10:43 AM
    Reply # 8239467 on 8179311
    Anonymous member (Administrator)

    The pawl is the small V shaped piece of metal that engages with the notches on the index wheel. The cheater moves it to left, or right providing fractions of an index adjustment.

    If you email me at I will send you a copy of an article Anthony Fitzgerald wrote on "Tuning the Gemmasta". He is a professional cutter who uses Gemmastas.

  • 11 Dec 2019 2:51 PM
    Reply # 8241179 on 8179311

    thanks i have spoken to Anthony and have received great help

  • 12 Mar 2021 3:24 PM
    Reply # 10187882 on 8179311

    Hi Bruce Copper, 

    I have just joined AFG and saw your advice on the forum where you mentioned tuning up a Gemmasta Faceting Machine and would like a copy that you mentioned on How to Tune a Gemmasta. Regard Wendy Purdie

  • 14 Mar 2021 10:02 AM
    Reply # 10193792 on 8179311
    Anonymous member (Administrator)

    email me at so I have your email address to send it to.

  • 25 Jun 2021 4:32 PM
    Reply # 10696906 on 8179311

    Hi all, we have just bought a GF3 and are going through the article by Anthony Fitzgerald to tune it and clean it up. Someone mentioned a degree splitter knob, which on is that please.

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