Crossfeed Lead Screw
Harbor Freight 9 x 20 Lathe
The new lead screw was turned from 1/2" drill rod. The threads are 7/16"-20
To cut the left hand threads for the leadscrew you will need to reverse the
direction the leadscrew. I did this with the Tumbler Reverse mod shown here
I first cut the shoulders for the new mount and threaded Test fit of the new mount.
the end for the handle attaching nut.
The 1/8" steel pin was cut down and the sides were filed slightly to achieve a "snug" fit. If you noticed the
4 rings on the shaft this is where I got a little carried away and removed too much material. This is where
the ball bearing for the handle rides. I used a tubing cutter as shown on the right to knurl or raise the metal
on the edges of the grooves. This added to the OD and allowed a tight fit again.
Once the handle end of the lead screw was completed I cut the LH threads.
The 1/2" drill rod is supported using a live center. The OD is turned down to 7/16"
to allow for the new 7/16"-20 LH threads. Since the threads are left hand
threads the cutting goes from left to right. I also left the lead screw about
1" long as seen on the right. This gave plenty of stopping room while cutting the threads.
When completed the lead screw was cut to the proper length.
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Copyright 2002 Steve Bedair