On 16/02/14 00:20, Phil Kangas wrote:
"Jim Wilkins" wrote in
message ...
"Phil Kangas" wrote in
message ...
Guy showed up here the other day asking if I
could repair the table lead screw nuts for a
RF mill drill. ;)} They are brass and one was
stripped out and the other was almost there.
He got it from a school shop and looks like
it was bumped or dropped, maybe that's why
the nuts are like this. So, buy new ones from
Rong Fu. Nope, can't find anything on the net
he says so I looked but nope, none. They are
7/8 - 10 acme. Did a web search for them but
nope, none available!Huh? Anyone know of
a source this nut? It would be easier to weld
it
to a flat bar to make the mill useable anyway.
Or spend time to make two of them on the
lathe. Time is money...
I replaced a worn-out Acme leadscrew on my
surface grinder with 3/4-10 vee-threaded rod. On
a Rong Fu it might be sufficiently accurate.
jsw
This jussst may be the way to go on this one!



Is it going to take you less time to modify standard threaded rod and
nuts than it is to make a couple of the 7/8" x 10 TPI nuts to suit the
current RF leadscrews. I see you may have to grind a special tool and
cut an internal thread which could then be cut down to make 2 nuts. I
would try and see how good the current leadscrews are and try and gauge
whether the owner is prepared to pay a sensible price for the work
either way.