Boxford Model C leadscrew half-nuts

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Boxford Model C leadscrew half-nuts

This topic has 57 replies, 13 voices, and was last updated 7 April 2021 at 08:17 by AJAX.

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5 April 2021 at 19:53 #538234
AJAX
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@ajax
Posted by Speedy Builder5 on 05/04/2021 19:43:45:

Not suggesting you buy these, but it shows re-threaded Southbend nuts

SB Half Nuts

Wow, they are expensive! New ones can be bought for less.
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5 April 2021 at 19:59 #538235
AJAX
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@ajax
Posted by David Caunt on 05/04/2021 19:49:06:

AJAX

At 3:11 into your video where it is just possible to catch a glimpse of the operating cam it is quite clear that the peg has worn the top right hand end of that slot. I would imagine the same would be true of the other slot which would have allowed the bottom to not be closed up fully. The top is probably the same.

Whilst your remedy obviously has got over the problem it looks as though my thoughts were correct.

Did you examine them? Or is it all just my imagination?

David, you made me doubt myself there and I had to rewatch the video. To save others the effort I have linked directly to the time you mentioned. I don't see any excessive wear but the next time I remove the apron (which probably won't be long) I will have another more careful look.
5 April 2021 at 20:04 #538236
AJAX
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@ajax
Posted by Bazyle on 05/04/2021 18:15:29:

Certainly an interesting fix.
I notice the rotation of the bolt also applies some longitudinal movement so there is potential (with good nuts) for using this to take up backlash for anyone using the lathe and vertical slide for milling.

Re the screwdriver slot. Perhaps one at the front, ie threaded end, or a hex dilled in would be avantageous.

Bazyle, that's a really nice idea and one that I might try. I particularly like the idea of a hex socket and know there's a tool to make one on a lathe but the name escapes me at present.

In any case I may remake the studs at some point maybe with a little more care and better choice of materials. I used some 3/4" EN8 as that's what I had to hand. What alternative material would people suggest – EN19? But then again I'm cheap and like to make do with whatever I've got.
5 April 2021 at 20:08 #538237
AJAX
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@ajax
A photo in case people don't wish to view the video…
6 April 2021 at 07:26 #538290
Howard Lewis
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@howardlewis46836
Rotary Broach? Mike Cox has written an article in MEW on making one.

Howard
6 April 2021 at 08:15 #538294
AJAX
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@ajax
Posted by Howard Lewis on 06/04/2021 07:26:31:

Rotary Broach? Mike Cox has written an article in MEW on making one.

Howard

That's the tool, thanks.
6 April 2021 at 20:52 #538417
old mart
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@oldmart
Posted by Speedy Builder5 on 05/04/2021 19:43:45:

Not suggesting you buy these, but it shows re-threaded Southbend nuts

SB Half Nuts

I looked carefully at the advert and was confused. There was mention of the nuts being original, but the threads looked like steel inlays. The seller should have cleaned the muck out of the threads, though, before taking the photo's.
7 April 2021 at 08:17 #538482
AJAX
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@ajax
Posted by old mart on 06/04/2021 20:52:55:

Posted by Speedy Builder5 on 05/04/2021 19:43:45:

Not suggesting you buy these, but it shows re-threaded Southbend nuts

SB Half Nuts

I looked carefully at the advert and was confused. There was mention of the nuts being original, but the threads looked like steel inlays. The seller should have cleaned the muck out of the threads, though, before taking the photo's.

The threads looked like they were inserts brazed in. Not to worry anyway as all fixed for now, and if I decide to replace it may be with new imports from Oz.
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