Boxford Screwcutting box / Leadscrew binding

[HollowpointParticipant @hollowpoint]

Posted by Speedy Builder5 on 15/03/2019 07:08:52:

Don't overdo the headstock greasers. On a cold day, if I screw the greasers down a couple of turns, it will reduce the speed of the headstock until things warm up. The headstock bearings don't need much grease. What gear train have you got between the headstock and the leadscrew ?

Mine does the same thing!

[andrew wrigleyParticipant @andrewwrigley45179]

Hi, I think it’s definitley motor related. It substantially better now I’ve tweaked the (inverter) vsd. But still struggles a bit on the really high feed rates not that I’d ever use anything this high, just testing. There’s no binding that I can find anywhere and generally all appears pretty good, but I suspect the motor is tired. Interesting over the course of a days use yesterday the motor running currents dropped by 1/3 amp so things are settling in and old grease in the headstock (perhaps) is loosening up.

I’m also getting some slip on the T-link belt so will address that next, the lathe has been out of action for 10yrs, so a few teething issues are expected. It’s definitley slack so I’ll try removing links as there’s no adjustment left on the lower pulley bearing blocks.

[HopperParticipant @hopper]

Treat the old girl to a new belt. They harden with age and glaze up, losing grip. Get a good brand name replacement so you know it won't slip from the get go. As per usual, some of the cheap imitations are not up to snuff.

[fishy-steveParticipant @fishy-steve]

Posted by Hopper on 16/03/2019 09:19:31:

Treat the old girl to a new belt. They harden with age and glaze up, losing grip. Get a good brand name replacement so you know it won't slip from the get go. As per usual, some of the cheap imitations are not up to snuff.

Has luck would have it. I have some for sale on ebay! 😁

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