Anyone familiar with Myford 254s ?

This topic has 17 replies, 7 voices, and was last updated 29 November 2014 at 11:58 by David Jupp.

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26 November 2014 at 17:34 #23599
Bob Unitt 1
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@bobunitt1
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26 November 2014 at 17:34 #170748
Bob Unitt 1
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@bobunitt1
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 ?
26 November 2014 at 18:06 #170752
Nick_G
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@nick_g
Posted by Bob Unitt 1 on 26/11/2014 17:34:37:

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
27 November 2014 at 19:50 #170820
Bob Unitt 1
Participant
@bobunitt1
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) :-
27 November 2014 at 20:11 #170821
Neil Wyatt
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@neilwyatt
As a guess, it may adjust the degree of engagement of the half nut.

Neil
27 November 2014 at 20:11 #170822
Swarf, Mostly!
Participant
@swarfmostly
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!
27 November 2014 at 20:15 #170825
Nick_G
Participant
@nick_g
.

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
27 November 2014 at 20:16 #170826
Bob Unitt 1
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@bobunitt1
Posted by Swarf, Mostly! on 27/11/2014 20:11:39:

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?

Oil drain plug.
27 November 2014 at 20:17 #170827
Bob Unitt 1
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@bobunitt1
Posted by Nick_G on 27/11/2014 20:15:01: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.

A clean lathe is the sign of a sick mind…
27 November 2014 at 20:38 #170830
Nick_G
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@nick_g
Posted by Bob Unitt 1 on 27/11/2014 20:17:55:

A clean lathe is the sign of a sick mind…

Nick
27 November 2014 at 20:56 #170833
JasonB
Moderator
@jasonb
Full drawing and parts list
27 November 2014 at 21:04 #170838
Neil Wyatt
Moderator
@neilwyatt
Yep, it has to be the halfnut engagement stop.

Neil
27 November 2014 at 22:19 #170848
Bob Unitt 1
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@bobunitt1
Posted by JasonB on 27/11/2014 20:56:34:

Full drawing and parts list

I have those thanks, I didn't want to reproduce them in full in case there was a copyright issue.
27 November 2014 at 22:21 #170849
Bob Unitt 1
Participant
@bobunitt1
Posted by Neil Wyatt on 27/11/2014 21:04:16:

Yep, it has to be the halfnut engagement stop.

Neil

Thanks. I wonder how it's supposed to be set …
27 November 2014 at 22:39 #170852
John Stevenson 1
Participant
@johnstevenson1
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.
28 November 2014 at 08:55 #170868
Bob Unitt 1
Participant
@bobunitt1
Posted by John Stevenson on 27/11/2014 22:39:51:

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.

Thanks John, enjoy your pint.
29 November 2014 at 11:30 #170987
Bob Unitt 1
Participant
@bobunitt1
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…
29 November 2014 at 11:58 #170990
David Jupp
Participant
@davidjupp51506
The drawing for the 254R on Myford site matches the equipment shown better than the 254S drawing.
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