GMF MM1A Grinder Shaft Thread

Hi I’m Bob, I’m 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 – 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.

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.

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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

Welcome to the forum Bob.

Ross

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

Michael

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

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

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

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

Quote:

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Originally Posted by BobF

Hi I’m Bob, I’m 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 – 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.

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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