Anyone familiar with Myford 254s ?

I'm servicing my Myford 254s and I've found an adjuster which isn't described in the service manual, and the guy at Myford doesn't know what it is either. Is there anyone on this forum who might be able to help ?

A picture of the item and it's location would assist greatly I would imagine.

Nick

This is all I have - I know it's a stop-crew, but not what it stops (Excuseme if I get it wrong, this is the first time I've posted an image here) :-

As a guess, it may adjust the degree of engagement of the half nut.

Neil

Hi there, Bob,

You've cropped your third photo. What's on the lower end of the leader line whose upper end is at the bottom left-hand corner of the front of the gearbox?

Best regards,

Swarf, Mostly!

.

I cannot assist you in it's purpose.

But I can say that some of the brethren here will be mortified to the degree of having to go to see their doctor tomorrow due to seeing a Myford so oily and dirty. --

Nick

Oil drain plug.

A clean lathe is the sign of a sick mind...

Nick

Full drawing and parts list

Yep, it has to be the halfnut engagement stop.

Neil

I have those thanks, I didn't want to reproduce them in full in case there was a copyright issue.

Thanks. I wonder how it's supposed to be set ...

Slack it off, close 1/2 nuts and keep pressure on to keep closed.

Then tighten the screw until it just takes over from the hand pressure. This means that it has the slightest clearance.

Job done, off down the pub.

Thanks John, enjoy your pint.

As suggested it controls the clearance on the engaged half-nuts. Someone on another list dug out the S7 manual page for me, and based on John's post and on that page I :-

Unscrewed the Stop-screw.
Engaged the leadscrew nuts.
Put a DTI probe on the Engagement lever.
Wound the Stop-screw up until the DTI indicated movement.
Removed the DTI.
Wound the Stop-screw up a further 1/4-turn.

Thank you all for your replies.

I'll now print this sequence off, along with my pictures, and put it in the manual - for the next time I can't remember what that screw does...

The drawing for the 254R on Myford site matches the equipment shown better than the 254S drawing.