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Old 30-11-17, 07:25 PM   #1
antiBRIGGSANDSTRATTON
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Default Lathe Spindle Nose Threads?

I have a Boxford CUD lathe here, with a 1.5'' x 8 TPI and have a number of chucks here that are a very similar thread, and screw on but they are a rather sloppy fit on there, one of these is a 'TRUGRIP' collet chuck, is there another spindle nose thread that is that similar?
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Old 30-11-17, 07:58 PM   #2
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Depends just how sloppy Matt? I have an AUD, and the backplates screw on with a bit of free play, until the nose register, behind the nose thread, engages with the matching socket in the backplate - then everything trues up nicely.

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Old 30-11-17, 08:18 PM   #3
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I have a 4 jaw and 3 jaw that fit really nicely, but these ones are much sloppier, but a couple don't screw down against the register, which makes me think they are a different thread, but I have used most of them to get me out of trouble before
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Old 30-11-17, 08:19 PM   #4
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Originally Posted by antiBRIGGSANDSTRATTON View Post
I have a 4 jaw and 3 jaw that fit really nicely, but these ones are much sloppier, but a couple don't screw down against the register, which makes me think they are a different thread, but I have used most of them to get me out of trouble before
I would like to find out what they are so I can flog them on
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Old 30-11-17, 08:48 PM   #5
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...or just replace the backplates with new ones. Easily available, except for 6", which have become a bit thin on the ground.

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Old 01-12-17, 09:29 AM   #6
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Ive got all the chucks etc I need for that lathe, so was looking to get rid of all the surplus chucks I have, I haven't used that lathe for a long time anyway, it wont get a look in when the Triumph gets plumbed in down the foundry
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Old 02-12-17, 08:08 AM   #7
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I have a Logan lathe that the Boxford was based on, so they share similar parts( so I have read) the main difference unless yours is a very early one is the nose thread on the Logan is UNC could you have UNC back plates?
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Old 02-12-17, 11:55 AM   #8
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Ah! possibly, UNC thread angle is 60 degrees which would explain why its got that bit more play than the others
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Old 02-12-17, 02:34 PM   #9
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Quote:
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I have a Logan lathe that the Boxford was based on...
???

I believe the Boxford was based on the American South Bend, which was a direct competitor for the Logan - I can't find any reference to the Logan being the inspiration for Denford/Boxford?

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Old 02-12-17, 05:55 PM   #10
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???

I believe the Boxford was based on the American South Bend, which was a direct competitor for the Logan - I can't find any reference to the Logan being the inspiration for Denford/Boxford?

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Hi Martin, I also thought there was some connection between South Bend and Boxford
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