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23rd Feb 2019, 11:51 AM #1Member
- Join Date
- Feb 2014
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- Newcastle NSW
- Posts
- 78
Hercus C model cross slide backlash....
Just after some advice on how to minimise the backlash in the cross slide.
I plan on slowly restoring the old girl over time to as close to origional condition as possible.
https://www.youtube.com/watch?v=aM5leCZa0nY
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23rd Feb 2019, 04:39 PM #2Most Valued Member
- Join Date
- Jun 2007
- Location
- sydney ( st marys )
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- 64
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That's more slop in nut and screw than backlash.
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23rd Feb 2019, 06:17 PM #3Member
- Join Date
- Feb 2014
- Location
- Newcastle NSW
- Posts
- 78
Ah ok thank you! Is there a way to adjust it or will i need to replace both the nut and screw?
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23rd Feb 2019, 06:37 PM #4Mechanical Butcher
- Join Date
- Oct 2004
- Location
- Southern Highlands NSW
- Posts
- 1,898
Some backlash won't hurt, but it's nice if it's not excessive.
First reduce the play that is a result of wear at the thrust collar - instructions in manual.
Then if it's still too much it's due to wear of the leadscrew and/or the nut.
There was someone selling adjustable split nuts for South Bends in USA, maybe still available.
That would deal with nut wear as it develops, but if the leadscrew is also worn you can only adjust the nut until it's just free at the tightest point on the screw.
The leadscrew could be replaced as a whole, or a new threaded Acme(?) threaded rod could replace the thread only.
SB9crossnut-ebay6900judy.JPG
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