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Backing plate for a jet 1236p chuck 60mmx8tpi

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Bill K

Swarf
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Oct 21, 2015
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#1
Hello all,
I'm one of the frequent lurkers on the site, just getting started in some serious amateur machining work. Finally got around to buying me a lathe and a mill, and a whole bunch of tooling, I am a retired shipwright so I have some some experience in machining, but mostly in welding, mechanical assembly and dc electrical , among other stupid things I've done in the past :).
I had a 1340 jet a while ago but found it too big for my shop so I got rid of it and got a 1236p jet lathe, along with a mayford ? knee mill, and I've got oodles of really nice tooling to go with them, ended up with a ALoris quick change head along with over 30 bit holders for it, I'm going to convert both of them to variable frequency drive or DC drive. I'm not sure witch yet along with digital readouts on both.
Anyway, the first thing I did was by a six jaw 8 inch Chuck for the lathe with a 2 1/4 by 8 tpi backing plate since I only had the Collett Chuck shown in the picture when I got the lathe, little did I know that the spindle on my lathe was a metric instead of American, I found out too late that it was a 60 mm x 8 TPI now I'm stuck since I don't have anything to turn out my own backing plate and I can't find anyplace to buy a backing plate in 60 mm, so my question is does anybody else have this lathe and if so, would they be willing to turn out a proper backing plate for my 8 inch Chuck? Of course any expenses including your labor and material will be covered along with shipping
the other option I was thinking of was that I could maybe grind my spindle down a little and succeed in doing it that way, I would end up having to remove some of the top thread dia. But it might just work, looking for opinions here.
Any help will be greatly appreciated. And of course if any parts are made monetary compensation will be made.
Thanks: zoomsplatt
you can call me at 360-420-0296 or send me your contact information and I will call you. or email
1-20170830_111033_1504116837690[1].jpg
 

craptain

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Sep 21, 2017
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#3
Absolutely do not grind the spindle. I am sure there's a few here that could help out, but in any case I would grab that chuck above. A 4 jaw is good to have around anyway.

Sent from my SM-G930T using Tapatalk
 

Dave Paine

H-M Supporter - Premium Member
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May 10, 2014
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#4
For the present backing plate, do you have enough metal to bore this out and insert a bushing?

I had never heard of 60mm spindle thread so I just learned something. I am surprised they went with metric diameter but imperial thread.

I have a Grizzly G9249 lathe, 12x37 which looks very similar to yours. I am happy mine has normal 2 1/4in x 8 tpi thread.
 

akabud

Swarf
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May 17, 2018
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#5
I have an extra backing plate I could part with. I have the same lathe as you and I just checked and it fit.
 
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