- Joined
- Feb 1, 2015
- Messages
- 9,647
Using a carriage stop when power feeding or threading has to potential to do some serious damage to the gears, the lead screw, or the half nuts. One trick that I have used is to loosen the drive belt so that it will slip when subject to a heavy load. Threading is a relatively light load so this works. For power feed you can always cut away from the headstock rather than cutting to a shoulder.
I have the Chough42 ELS on my lathe and the stepper motor has fairly low torque. I could use a carriage stop there but the stepper would lose steps and would have to be resynchronized before I could resume threading. Still, better than crashing into the chuck.
Some time ago, I designed an auto release for the half nuts which would in theory stop feed within a few thousandths. However, since then , I replaced the OEM motor with a dc motor which can be slowed to 5 rpm if need be. I can thread up to the exact same point on each pass which removes the need for an auto release so it never got built.
I have the Chough42 ELS on my lathe and the stepper motor has fairly low torque. I could use a carriage stop there but the stepper would lose steps and would have to be resynchronized before I could resume threading. Still, better than crashing into the chuck.
Some time ago, I designed an auto release for the half nuts which would in theory stop feed within a few thousandths. However, since then , I replaced the OEM motor with a dc motor which can be slowed to 5 rpm if need be. I can thread up to the exact same point on each pass which removes the need for an auto release so it never got built.