Working at a small scale
File Handle | 15/08/2023 18:37:38 |
250 forum posts | Thanks for all of the replies. |
Grindstone Cowboy | 15/08/2023 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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