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24-08-2009 #1
Hi all,
This is one for the experts, JohnS, Robin, etc. I suspect.
I need to fix the backlash on the cross- and top-slide on the lathe (the 85y old one)
It currently has 8tpi ACME (or something like that, square topped) threaded screws working onto a tapped cast-iron block which is the slide itself. In other words there is little opportunity to make another part. I'll get some pics/drawings done in due course but I'm guessing the wear is in the cast-iron block (nut) and not the screw as I can move the slide back and forth 2mm on the screw.
What are my options if I:
- want to retain the existing screws
- fit new metric trapezoidal screws, say TR10x2
- bore out the cast iron block (with my new boring head on the mill), assuming there is space and fit a bronze/delrin/whatever sleeve.
- mill out a section of the block and drop in a new 'nut'
I think the advantage of the second approach is I can trial different nuts and maybe get some form of anti-backlash approach in there...
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