I have maintenance responsibilities for The Rong
Fu mill which is about 15-20 years old. I am
trained as a physicists not as a machinist. So
please excuse my lack of understanding and misuse
of terminology. This milling machine along with a
small lathe are used in a junior/semior physics
lab to give the students a taste of what
metalworking machine can do.
There was a lot of backlash (0.020'- 0.030' on
the hand wheels) in both the front to back feed
and the right to left feed. I cut a small hole in
the table below the mill and tightened up the
partially split leadscrew nut. This reduced the
front to back backlash to a few thou. At this
point the tightening screw was getting hard to
turn and the handwheel for the motion was pretty
stiff, so I stopped.
On to the right to left backlash. This
leadscrew seems held in tension from both ends, so
I tried shimming one end out just a bit to
eliminate any slop in the connection between the
leadscrew and the table.
Next, I tightened the adjusting screw on the
leadscrew nut as much as I could and now am down
to about 0.015" of backlash on the handwheels.
Better but not great.
1. Any good ideas as to how to further reduce the
backlash in the left right feed?
2. How does one tighten up the jibs on this
beast? There is a single large screw running the
in the same direction and the motion the moves the
jib in that same direction.
17 years ago