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  1. #16
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    Eric
    So what was the original colour of yours?
    peter

  2. #17
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    Jan 2018
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    Aldinga Beach.
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    There must have been a few models of the GMF BG, I have an oldish one I bought in 1976, it didn't have the table securing post through the base though.

  3. #18
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    Nov 2008
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    Perth WA
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    IMG_20180821_163844925_BURST000_COVER_TOP (Large).jpg IMG_20180821_163824065 (Large).jpg

    McPherson's 1960 catalogue shows the round motor housing as per China's photo.

    BT

  4. #19
    Join Date
    Jul 2011
    Location
    Adelaide
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    837

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    Bob,

    Thank you for the scan from the McPhersons catalogue.
    The grinder with the Douglas attachment looks exactly like mine (which is an 8") except for the switch which on mine has a pressed metal shelter over it with GMF embossed in it. Otherwise all the small details are identical so I am supposing my grinder is from around that period. The serial number is F54555 which might give an indication of date too.

    Eric

  5. #20
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    Jul 2011
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    Adelaide
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    Untitled.jpg
    Today I stripped this apart and took everything but the casting with the stator in it to be sandblasted. The original green paint seems to be a good match for rustkill mid brunswick green which suits me.

  6. #21
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    Jul 2011
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    Adelaide
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    IMG_20180822_085154.jpgI cleaned the thick black paint of the plate it seems that the low areas of this plate where filled with red except around the GMF logo which was black. Unfortunately that wasn't saveable and the poor grinder will have to make do with a brass plate.

  7. #22
    BobL is offline Member: Blue and white apron brigade
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    I cleaned the thick black paint of the plate it seems that the low areas of this plate where filled with red except around the GMF logo which was black. Unfortunately that wasn't saveable and the poor grinder will have to make do with a brass plate.
    I don't quite understand - the brass plate looks fine to me.

    Just thinking 1/2HP might be a bit light for 8" wheels and may work better with 6"?

    FWIW here are my two 1HP 8" GMFs (before I tidied up the wiring)
    The gold one now has a green wheel on the RHS shaft.
    1VFD2G.jpg

  8. #23
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    Quote Originally Posted by BobL View Post

    Just thinking 1/2HP might be a bit light for 8" wheels and may work better with 6"?
    No not really. My old one has been running the full 8" wheel (at least when first fitted) for probably as long as I've been alive with no problem. Even with wire brushing or buffing its alway had enough power.
    peter

  9. #24
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    Jul 2011
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    Adelaide
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    Quote Originally Posted by BobL View Post
    I don't quite understand - the brass plate looks fine to me.

    Just thinking 1/2HP might be a bit light for 8" wheels and may work better with 6"?

    FWIW here are my two 1HP 8" GMFs (before I tidied up the wiring)
    The gold one now has a green wheel on the RHS shaft.
    1VFD2G.jpg
    That brace of grinders looks very pretty.

    I have no idea how good 1/2hp will be on the grinder as I didn't use it before I pulled it apart. Now its too advanced to stop until its finished.

    I picked up the bits from the sandblaster but ran out of primer before I finished coating them today. Hopefully i will have some new bearings tomorrow.

  10. #25
    Join Date
    Jan 2004
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    Mackay North Qld
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    6,446

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    Quote Originally Posted by lamestllama View Post
    I have no idea how good 1/2hp will be on the grinder as I didn't use it before I pulled it apart. Now its too advanced to stop until its finished.
    Hi lamestllama,
    If your GMF is like all the other GMF bench grinders I have encountered in my time spent in educational training institutions, it will be nothing less than brilliant.
    They are certainly far better than anything readily available today.

    The fact that the machine will spin on for some minutes after shut down is an indicator of how well they were designed and manufactured. If there is a better class of bench grinder available here in Oz ,well, I am yet to encounter it. To me GMF grinders are the Rolls Royce of the industry.

    Grahame

  11. #26
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    Jul 2011
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    Adelaide
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    IMG_20180824_153556.jpgSome progress. Epoxy primer then epoxy filler over the places with voids in the castings.

  12. #27
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    Jul 2011
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    Adelaide
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    Quote Originally Posted by bollie7 View Post
    Eric
    So what was the original colour of yours?
    peter
    As they say a picture is worth a 1000 wordsIMG_20180822_150205.jpg

  13. #28
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    Aug 2008
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    Charlestown NSW
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    Eric
    Thanks for that. That is actually not much different from the green enamel I painted mine with back in the late 1970's. I must have fluked it at the time as I only used some green paint that my Dad had.
    peter

  14. #29
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    Adelaide
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    Quote Originally Posted by BobL View Post
    FWIW here are my two 1HP 8" GMFs (before I tidied up the wiring)
    The gold one now has a green wheel on the RHS shaft.
    1VFD2G.jpg
    Bob,

    Nowadays they make VFDs that are probably small enough to fit in the base of those old three phase GMF grinders. How hard were they to convert to delta wiring?

    Eric

  15. #30
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by lamestllama View Post
    Nowadays they make VFDs that are probably small enough to fit in the base of those old three phase GMF grinders.
    The base looks like it has a lot of room but there's not as much as it looks. Having a VFD inside one to run both would add to the space problem.
    How hard were they to convert to delta wiring?
    Tricky, mainly because there's not much room inside the motor.

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