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Sounds like you are heading in the right direction Ed. You'll have it sorted in no time.
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Mayhem (07-03-2014)
Ed, I suspect that when you examine the nut for scratches from the trough you'll find the marks to be on the corners that have resulted by the flat milling to reduce the nut's downward length. (boy! in the efforts to 'splain clearly I seem to have composed a confusing prattle
) .
All that to say, rounding the corners by file or mill will eliminate the interference.
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(07-03-2014, 06:29 AM)stevec Wrote: Ed, I suspect that when you examine the nut for scratches from the trough you'll find the marks to be on the corners that have resulted by the flat milling to reduce the nut's downward length. (boy! in the efforts to 'splain clearly I seem to have composed a confusing prattle ) .
All that to say, rounding the corners by file or mill will eliminate the interference.
Steve,
I was thinking the same thing while laying in bed this morning wondering if I should get up or just lay there. Anyway, I did chamfer the two corners but not much so I'm going to chamfer them heavily and see if that fixes the scrapping sound. I didn't see any scratches on the bottom of the nut so it must be the corners that are rubbing on the trough. That's a good thing since it's an easy fix.
Ed
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The .008" shim didn't do the job. The total travel on the cross slide is about 7" and with it cranked all the way towards the back of the lathe I can bring it forward with both screws tightened and it moves nice and smooth. Once I get to about the 4" spot it starts to bind. The binding seems to be at the same spot on the hand crank but the closer I crank it towards me the more it starts to bind overall. I can loosen the two screws slightly and it will be smooth sailing. This is getting frustrating but maybe I just need to keep going up in shim thickness and see if I can ever get smooth travel throughout the entire length. I'm taking a break from it for now.
Oh, and the scrapping sound went away when I added the .008" shim. I'm guessing it wasn't a scrapping sound but more of a binding sound because I never did find any scratch marks on the nut.
Ed
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That sounds like the same complaint you made in post #1. Have you checked to see that the leadscrew is parallel to the slideway?