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  1. #1
    Join Date
    Oct 2021
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    Toogoom Qld 4655
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    82
    Posts
    1

    Default GMF MM1A Grinder Shaft Thread

    Hi Iím Bob, Iím a retired electronics and communications technician. I arrived at this forum looking for information on the shaft thread size for a GMF MM1A grinder 1944/5 vintage, in order to purchase a taper shaft (or a pair of them, left and right thread). searching the internet I gather the thread could be either BSF or Whitworth, the shaft outside thread diameter is 15.5 Ė 15.8 mm/0.61 - 0.622 inch I would appreciate thread information on the above mentioned grinder if anyone can help. The local tool suppliers only carry metric tapers,
    Thanks in anticipation.

  2. #2
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    5,896

    Default

    Hi Bob,
    Welcome to the MetalWork forums.

    You have joined a great bunch of people always willing to help.

    Thanks for having the courtesy to introduce yourself to the Forum. You will find plenty here who have the same interests as yourself.

    Please take the time to navigate around the forums to view the varied and interesting subjects.
    The is a large selection of places to see on our sub forums.


    To do this, goto the the FORUM box in the top left hand corner of the screen. Click Forum Home and a scroll down page will come up.

    Scroll down the page and the various help pages and sub forums shall be shown.

    Please read the Terms of Use on the very top of the scroll down page - they are our rules.
    To save time here's the link

    https://metalworkforums.com/f90/t197...terms-tou-read

    Many pages also have a sticky at the top.If you post its always a good idea to check the sticky ,if there is one there.

    Grinder questions can be discussed in the General MetalWork forum.

    We have talked about GMF bench grinder restorations many times here at MetalWork forums. The best place for this is to ask these questions on the Metalwork General or MetalWork projects if its an ongoing project..

    If unsure about procedures, the how to's of the Forum, I am happy to help if you wish to PM me.

    Again, welcome to our forums.

    Grahame

  3. #3
    Join Date
    May 2013
    Location
    Rockhampton, QLD
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    66
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    417

    Default

    Welcome to the forum Bob.

    Ross

  4. #4
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    56
    Posts
    5,978

    Default

    so a 5/8" BSF will be 14 teeth per inch, a 5/8" WW will be 11 teeth per inch.

    Michael

  5. #5
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    63
    Posts
    1,494

    Default

    Gday Bob.
    Can you post up a pic of your GMF grinder?
    I have an old one which I reckon would be of that vintage. Happy to measure the thread tomorrow (just have to remember to do it).
    regards
    peter

  6. #6
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    63
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    1,494

    Default

    Bob.
    I just measured my old GMF and the thread is 5/8" UNF.
    regards
    Peter

  7. #7
    Join Date
    Oct 2010
    Location
    NSW
    Posts
    137

    Default

    Peter beat me to it, but I also checked my old GMF and it's also 5/8x18 UNF.

  8. #8
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    63
    Posts
    1,494

    Default

    My old grinder.
    It was old when I got it in 1976. I put new bearings in it then and painted it.
    Actually thinking about painting it again, but don't want to make a hasty decision on that.
    Peter
    Attached Images Attached Images

  9. #9
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    5,896

    Default

    Quote Originally Posted by BobF View Post
    Hi Iím Bob, Iím a retired electronics and communications technician. I arrived at this forum looking for information on the shaft thread size for a GMF MM1A grinder 1944/5 vintage, in order to purchase a taper shaft (or a pair of them, left and right thread). searching the internet I gather the thread could be either BSF or Whitworth, the shaft outside thread diameter is 15.5 Ė 15.8 mm/0.61 - 0.622 inch I would appreciate thread information on the above mentioned grinder if anyone can help. The local tool suppliers only carry metric tapers,
    Thanks in anticipation.
    Imperial taper spindle for 8"polishing wheel

    https://polishup.com.au/product/righ...-5-8-imperial/
    l
    Lots of other shops/sources too found under keyword of polishing accessories.

    Grahame

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