SB Heavy 10 chuck thickness

[brandon428]

I'm a long time user of a 9A and a Heavy10 with a Camlock. I recently acquired another Heavy10 with a 2-1/4"x8 threaded spindle. The chucks all seem at least 1-1/2" thicker than the Camlock and 2"-3" thicker than the 1-1/2"-8 spindle on my 9.

Part of this seems to be that the 2-1/4"-8 chucks have a noticeable shoulder on the back where the threads are contained, versus them being mostly flush with the 1-1/2"-8 and cam lock.

Feels like I'm losing quite a bit of space. Is this common because of the larger diameter spindle or did I just end up with chucks that are really thick?

 

[B2]

I have a SB heavy 10 with screw on chucks. Would you like for me to measure or photograph something on mine?

 

[brandon428]

That’d be great, thank you. Can you measure from the face of the chuck to the back of the chuck. Picture could be nice too - is the internal threaded portion bossed out or flat against the back.

 

[B2]

Can you get the info you need from the following pictures? I have three vise, a three jaw and two four jaw. I laid the two loose vise on the lathe bed next to the mounted 3 jaw chuck so that you could see them all in one photo. I laid a flexible tape across then so you could read the measurements. I assume you do not need much accuracy. The 6" diameter, three jaw vise is mounted. The largest 4 jaw is on the right in the photo and is about 7.5" diameter. The 3 jaw has the Cushman circular tag with number. The large 4 jaw is also a Cushman, but is stamped with the number. The 6" diameter, small 4 jaw has South Bend made by Skinner Chuck. The spin on chuck may not be as accurate as the D1-5 chucks that are on my PM1440GT, but they sure are easy to change out. My old SouthBend runs but needs some LTC, especially on the cross feed etc, but it still works. One of these days.... I may get around to fixing it up. As you maybe able to see I have some work mounted in the three jaw chuck as I was using it to manually bend square hooks on the ends of some sheet metal strips. I also included a few of pictures to allow you to ID lathe ID model. As you will see it has the extended Norton gear box. I bought this plus the chucks used out of a university shop in 1989 for $500 then I spent about $100 for a single phase motor. Not having any use for the 3 phase motor back then I gave it back to the shop. Now I wish I had that motor. I would put it back on and add a VFD to get addition speeds. VFD equivalents, back then, occupied a large box of electronics and would have cost a lot more than the lathe!

 

[brandon428]

I was hoping for a bit more accuracy with the #'s, but this gives me a rough idea. I'll compare against what I have. Thanks again.

 

[B2]

OK. From your original message I thought you were just trying to get an idea.

Lathe bore ~1.425" ( I have a rod inside so I could not measure very accurately.)
ID at thread ~2.09" (One would have to add the thread depth to get this thread diameter.... probably 2.25" nominal.)
Clearance inside the shoulder, before the threads start ~0.5" (I measured one, they all look similar.)

Chuck: Shoulder + Thickness = Total depth
~ 6 inch diameter, 3 Jaw : ~ 0.70" + ~3.025" = ~3.325"
~ 6 inch diameter, 4 Jaw: ~ 1.09" + ~2.50" = ~ 3.59"
~7.5 inch diameter, 4 Jaw: ~ 2.06" + ~2.95" = ~ 5.01"

Dave L.

 

[wlburton]

I'm a long time user of a 9A and a Heavy10 with a Camlock. I recently acquired another Heavy10 with a 2-1/4"x8 threaded spindle. The chucks all seem at least 1-1/2" thicker than the Camlock and 2"-3" thicker than the 1-1/2"-8 spindle on my 9.

Part of this seems to be that the 2-1/4"-8 chucks have a noticeable shoulder on the back where the threads are contained, versus them being mostly flush with the 1-1/2"-8 and cam lock.

Feels like I'm losing quite a bit of space. Is this common because of the larger diameter spindle or did I just end up with chucks that are really thick?

The body of the South Bend-labeled 6" three jaw chuck on my 1950 10L is just over 3" thick and the boss adds about another .665". This seems very close to Dave L.'s measurements.

 

[brandon428]

Thanks both for the measurements.

My 10L chuck's are actually smaller than what both of you have:
6" 3-jaw: 3-1/16" and 6" 4-jaw is 2-15/16" -- both are vintage with Made in USA stamps but no maker.

The difference I was seeing was versus my 9" where I have:
5" 3-jaw (Cushman): 2-3/4" and 6" 4-jaw (Westcott) is 2-3/16", both of which are ~3/4" thinner.

I suppose the 5" versus 6" for the 3-jaw can make a difference. The shoulder on my 10L 4-jaw is more than half of the thickness (which looks strange to me), and maybe I just have a really thin 6" 4-jaw on my 9.