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14BA die and 15 thou split pin.

Working at a small scale

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File Handle15/08/2023 18:37:38
250 forum posts

Thanks for all of the replies.
I was aware that I shouldn't be calling them cotter pins, not sure how I picked up the error, I was curious if I was alone in doing so.
Looking online 16 BA "nuts and bolts" seems to be the smallest commonly available. Seeing the price of 14BA dies I am sort of regretting not buying it, but I don't really have a use for it.
I am impressed with the small scale that some people can work to. I do have a pack of 1/64th drills that I have had for decades, but never really had a need to use them. Probably not confident to try. I have never looked at how well their tips are ground, will check them out.
Keith

Grindstone Cowboy15/08/2023 18:44:01
1160 forum posts
73 photos
Posted by Simon0362 on 15/08/2023 14:21:27:
Posted by Bazyle on 15/08/2023 10:59:39:

The lathe they used for this had a system for correcting leadscrew errors which must have worked down in the tenth of thous region.

Sheer curiosity, but how on earth do they do that?

Don't know about that particular instance, but a late friend who was apprenticed at Broadbent lathes once tried to explain to me a system for doing this - not sure I got all the details, but it involved a sort of linear cam, or wavy ramp, parallel to the leadscrew. The leadscrew nut (possibly a solid nut rather than half-nuts) was rotated slightly in both directions by this, thus cancelling out pitch deviations in the leadscrew thread. Hope I've explained that clearly, it did make sense when he told me, although I have since wondered how they got the nut follower to bear on the cam, some sort of spring-loading, possibly?

Rob

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