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9" SM Utilathe Restoration

RobinHood said:
Which line are you trying to spilt it at? Red arrow or green?

View attachment 18284

Looking into the bore from the front / back, do you see a step? If there is a step, you might be able to use an aluminum or brass drift and a hammer as a persuader to help it separate.

My guess is there is corrosion or just old, dried gunk holding it together.
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Red arrow, there is no seam at the green arrow. You're probably right about it just being corroded on. @Brent H said it was a rust fur ball when he took possession of it.

Hmmm.... hang on here. Maybe there is a seam at the green arrow. That would explain why it wouldn't tap off.
 
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Roger.

They can take quite the hits to get them apart. If you don’t like metal on metal, use a piece of hardwood.
 
Johnwa said:
I just checked the bolt circle diameter on mine. It is about 2.7”
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Really? Mine is very close to 4". Guess a back plate swap won't work then.

Both chucks are out. Should be 3.74" for a 6" 4J.

littlemachineshop.com

Lathe Chucks

This page provides lathe chuck capacities and mounting dimensions.
littlemachineshop.com littlemachineshop.com
 
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4J.JPG


@Johnwa That 4J just spun on my lathe no problem, no modification required. Thanks for swapping chucks with me. Now I can cut threads running the lathe in reverse:)
 
Johnwa said:
I find it way quicker to thread using the dial.
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I use the threading dial all the time, I just want to thread away from the headstock. I find threading toward the headstock way too unnerving LOL.

Did my 4J mount on your machine ok?
 
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YYCHM said:
I use the threading dial all the time, I just want to thread away from the headstock. I find threading toward the headstock way too unnerving LOL.

Did my 4J mount on your machine ok?
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That makes sense.
The 4jaw doesn’t screw on. My measurement of the bore on the crack plate is 1.495” and my spindle measures 1.503. I will have to bore a few thou out of the backplate.
I’ve taken the chuck apart. The backplate just popped out..
 
Johnwa said:
That makes sense.
The 4jaw doesn’t screw on. My measurement of the bore on the crack plate is 1.495” and my spindle measures 1.503. I will have to bore a few thou out of the backplate.
I’ve taken the chuck apart. The backplate just popped out..
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You got that back plate off:confused: It wasn't going to come off for me without beating on it. Did you remove the jaws or anything like that? As I said I have another 4J with backplate inbound from @140mower. You want to wait and see what that one measures?
 
Well I did use a hammer. Only 1 vigorous tap and it came apart.
I’m not in a rush, I’ll have to be in the right mind set before I attempt to bore it out.
 
Johnwa said:
Well I did use a hammer. Only 1 vigorous tap and it came apart.
I’m not in a rush, I’ll have to be in the right mind set before I attempt to bore it out.
Click to expand...

This chuck is from @140mower 's SB stash. Maybe they are a little bigger in the BP recessed area? What machine are you attempting to mount it on?
 
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