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Thread: crossslide leadscrew nut
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22nd May 2014, 01:22 PM #31Member
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I guess my question was more "is the technique of intentionally missaligning the leadscrew nut a valid technique"?There appears to have been no way to adjust the nut originally.
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22nd May 2014 01:22 PM # ADSGoogle Adsense Advertisement
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22nd May 2014, 01:30 PM #32
I would not do it. What I would do is ignore pc and his usual bs.
The best thing to do is pull the nut out and split it yourself, then add some jacking screws and you should be able to eliminate a lot of the backlash. Of course parts are not available at all for the mars, but maybe an imperial hercus nut may be able to be fitted.
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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23rd May 2014, 10:31 AM #33Member
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Rather than pinching, I guess a spread could be achieved by drilling and running a taper tap in part way, (perpendicular to the nut axis), slitting through the middle of the holes, and then run grub screws in - once you hit the partially formed threads, it'll start spreading.Could always use the split delrin nut technique to make a new nut - I hopefully won't be leaning on it hard enough to hurt one.
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23rd May 2014, 11:00 AM #34GOLD MEMBER
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23rd May 2014, 01:19 PM #35
You can also spread by simply drilling and tapping thin section and using a grub screw to jack the split open. This is how i have done it. You have to be careful though, if your leadscrew is worn in the middle and not at the ends you have to adjust it for the ends and not the middle, leaving some backlash in the middle still.
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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23rd May 2014, 04:31 PM #36Member
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Well aware of allowing for the wear in the middle - the first lathe i spent any serious time with was a *seriously* flogged out government Hercus - trying to do anything remotely precision with that was a challenge! With the cross slide adjusted to bind at the ends, there was still enough play in the middle to rock the toolpost a good 2 or 3mm... had to use bodyweight to preload the post one way.Good point on the grubs.
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