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Thread: Goodell Pratt bench grinder
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18th October 2016, 07:31 PM #1
Goodell Pratt bench grinder
Team
I picked up this little grinder however it's missing a left hand half inch nut to hold the grinding stone in place. I went to the local bolt factory and got an imperial half inch left hand nut and it does not fit. I ended up taking the grinder to the factory and they said they don't have one.
Is anyone familiar the threads that goodell Pratt used? And does anyone know where I can get a left hand nut for the grinder ?
Cheers
Stew
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18th October 2016 07:31 PM # ADSGoogle Adsense Advertisement
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19th October 2016, 07:58 AM #2
Looks like a left hand thread?
H.Jimcracks for the rich and/or wealthy. (aka GKB '88)
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19th October 2016, 08:09 AM #3
It is
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19th October 2016, 08:19 AM #4Senior Member
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I assume that you've measured the diameter at 1/2 inch? Short of using a thread gauge you can use a ruler and count how many pitches per inch. From that you have something to ask for if you can find somewhere that sells left hand nuts. Or find a machinist, or twist someone's arm here to make one.
Graham.
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19th October 2016, 08:27 AM #5
I'm definitely more of a wood worker than metal worker :/
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19th October 2016, 10:02 AM #6So that's how you change this field...
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I'd hazard a guess that the tpi and the even the pitch angle/thread profile might not be a standard imperial thread on that grinder. It's a nothing job for a machinist to make one (or a couple), but convincing one to do it may be your undoing.
Goodell-Pratt were bought by Millers Falls, which was in turn bought by Ingersoll-Rand and then looks to have been spun off and then taken over by a Chinese company. Given the dive that has occurred in the quality of the tools they make, I'd say that the intellectual property died around the time of the spin-off from Ingersoll. Which kinda kills the opportunity to email them and ask if they still have plans in a dusty cabinet.
I can't access it from my current internet connection (annoying blocks all over the place), but this may help: Restoring a Goodell-Pratt Hand Grinder - Lone Pine Toolworks
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19th October 2016, 11:14 AM #7Senior Member
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Yes, this is a pretty simple job. If Stew draws a blank on a source, I'll volunteer to make one. I'd need to check that I have some hex stock of the right size, and without a complete thread definition (dia. pitch, thread from, required fit) I'd need the shaft to fit the nut to. I'm located in northern Sydney.
Graham.
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19th October 2016, 07:32 PM #8
I've probably got some hex if you haven't.
H.Jimcracks for the rich and/or wealthy. (aka GKB '88)
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20th October 2016, 06:12 AM #9GOLD MEMBER
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Impressive looking grinder but I bet it would enjoy eating the odd finger or two!
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20th October 2016, 07:15 AM #10Senior Member
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20th October 2016, 12:02 PM #11SENIOR MEMBER
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20th October 2016, 12:31 PM #12Senior Member
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Just a plain spacer then, same diameter as the wheel flange. Stew, can you measure the diameter of the flange. I'll make the spacer match.
Graham.
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20th October 2016, 02:32 PM #13Member
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almost looks to me like beaten up Acme thread, possible? it is American.
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20th October 2016, 02:53 PM #14Senior Member
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Yes, from the photo it could well be a square thread of some sort. I'll wait for the shaft, measure it up, then grind a tool if I need to.
Graham.
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25th October 2016, 09:40 PM #15Senior Member
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Stew has sent the shaft to me, it arrived today. The thread is a 1/2" 13 tpi V groove thread, so it's 1/2" UNC. I have a thread cutting tool somewhere, just need to dig it out and get the nut turned.
Graham.
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