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@old_toolmaker
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Nice job on the mod and the write-up.
I know this is an older thread but I just got here and hope you can answer a question for me.
In your photo named Cross Feed ScrewAssy B.jpg, you show a cylindrical piece with a hex socket flat head screw (sitting in place) and two grooves for o-rings. Let's call that the nut because I assume it's threaded to mate with the end of the leadscrew.
As best I can figure the design, the nut retains the hand wheel and sets the clearance/preload on the thrust bearing. If so, then apparently, the two o-rings provide some friction to maintain the nut adjustment. Also, the end of the leadscrew is not tapped to accept the hex socket screw. The hex socket screw is fixed to the nut. Did I figure it out correctly? If not, please advise.
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You assume correctly on all counts except one. The item you refer to as a flat head socket cap screw is actually jus the head of a low head socket cap screw. I machined and used only the head of the screw and fastened it in place with lock tire. I made it a close fit and the locktite does the job well. I could have broached a hex into the steel nut but took the easier faster way. I works very well as designed. The cross slide is unbelievably smooth and silky operating. I plan on doing the same with the compound.
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Thank you Dick,
It took me a while to work out that the purpose of the hex socket screw head was to "drive" the nut rather than to fasten or jam anything. LOL
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My original design had a set screw that snugged up against the end of the feed screw to prevent rotation once the adjustment was correct. That would have worked nicely as well.
