• This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn more.
  • Guest,  We want to wish You and Your Family a Healthy, Happy Thanksgiving! Click the "X" at the top right corner to remove this notice)
  • PLEASE: Read the FORUM RULES BEFORE registering!

4

My Lathe Threading Dial Stops Turning When Half Nuts Are Engaged.

3
Like what you see?
Click here to donate to this forum and upgrade your account!
10
Status
Not open for further replies.

wa5cab

Downloads Moderator
Staff member
H-M Supporter - Sustaining Member
Joined
Dec 25, 2011
Messages
3,763
Likes
722
#1
This is a perennial question from new lathe owners. EDIT - This actually applies to any lathe equipped with a lead screw and threading dial. Not just the Atlas built ones.

With the motor running, and the FWD-REV gearbox in FWD or REV (Atlas 9" or 10" without QCGB) or the Tumbler lever in either FWD or REV (all other Atlas or Atlas-Craftsman models), the lead screw should be turning.

If the carriage is stopped with the half nuts (AKA split nuts) open/disengaged and the gear on the bottom of the threading dial engaged/meshed with the lead screw, the threading dial should be turning. This is normal.

When you engage or close the half nuts, the carriage should start to move to the left or the right. And the threading dial should stop rotating. THIS IS ALSO NORMAL! The reason is that with the carriage moving to the left or right as the lead screw turns, it and the threading dial gear are not moving relative to the top of the lead screw thread visible just to the right of the threading dial. So the threading dial gear and dial do not rotate.
 
Last edited:
Status
Not open for further replies.
[6]
5 [7]