Member postings for andrew wrigley

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.

Same here! Fortunately didn’t download it either.

Hi, I’ve been through a few checks including checking the leadscrew for straightness, it is. Checking things are running ok without the gearbox connected etc. and all is ok on the saddle. I’ve measured the current draw on the vsd and checked a few parameters, and think it’s possibly the vsd settings. So I’ve been through all the settings, optimized what I can upped a few parameters such as the ‘torque boost’ that ups the volts when under load (I think). Anyway things seem a little better and it’s not bogging down quite the same. Not having another lathe to compare it with leaves me guessing a bit, but I’ll try it for real tomorrow and report back.

Thanks for all the support so far

Thanks all, I’ll have a work through some of the suggestions this evening. I’ll work up from the motor through to the headstock and then onto the box.

I have tried some of this already where I think I’ve established that I can get a reasonable cut on if I hand feed it, but once the screwcutting box is engaged and then underload, ie cutting, the motor is loading up more than I expect. This is what made me think of the thrust bearings on the lead screw.

Thanks for the manual link, unf. there’s nothing in there about removing the box.

I’ve just tried on the half nuts, as it only happens occasionally I can’t be 100% sure, but the symptoms appear the same. It really slows the motor if u add resistance to the hand wheel, but I this could be normal?

Hi Folks, this is my 1st post on here so hi to all other home engineers out there.

I’ve just purchased a Boxford AUD which is generally all ok, with no issues other than when making a cut using a feed with the clutch occasionally the machine binds up. The feed speeds are from normal to slow and I’ve tried using a variety of gear combinations, the gears aren’t jumping or grinding it simply tightens up and stalls. Once the clutch is released and the motor restarted all is ok. The motor sounds like it’s starting to labour as soon as the star wheel is tightened. On a hand fed cut this is not happening.

i suspect there may be an issue with the gearbox (to leadscrew) output shaft but I dont know how to remove the screw cutting gearbox. The 3 screws that I believe secure the box to the bed are covered by the main headstock casting?

Any thoughts or ideas or advice on how to remove the box for a service. Or is there something I should look into before I dive in?

Thanks

Just a quick hello to the other forums users.

I’ve bought myself a Boxford AUD after a 20yr break from lathe ownership to assist with restoration and modification of Datsun 260z. At present I’m just enjoying tinkering and re-learning old skills but I do have a couple of issues with the lead screw I’m going to be asking for help and advice with from other owners. Speak soon!

Cheers

Andy