Myford

Hi I've just acquired a myford ml7 tri lever just got it set up and noticed the thread dial indicator turns when the lead screw is turning but when I engage the half nut it stops is this how it should be I've not ryed screw cutting yet but looks quite complicated to set up any tips on this would be good

Thanks in advance

Relax Kevin

That's how it is supposed to work! The indicator rotates and tells you when to engage the clasp nut.

I' m away from the workshop & my data at the moment but will post tomorrow if no body can give you the detailed info. in the meantime.

Regards

Norman

Edited By NJH on 03/11/2015 22:52:58

Hi Kevin,

I have an MLS-7 with a threading indicator. I have slacked-off the clamp nut and swivelled it round a bit so gear @ bottom of fitting doesn`t engage leadscrew under normal useage, i.e., when not screwcutting. The idea is that if thread being cut is a multiple of leadscrew thread, in this case, 8tpi, then you can re-engage the clasp nut @ any of the 4 divs, This only applies to Imperial not Metric threads. HTH.

John.

Kevin,

Please get yourself an official Myford handbook for your lathe as they are very informative and tell you almost all you need to know. You can download a pdf from the net or buy one from new Myford.

Also useful is "Myford series 7 manual" by Ian Bradley which is currently in publication.

Why would you wish to dis-engage the screw thread indicator DMB ?

Martin

Hi Kevin

I suggest that you sign up with Yahoo groups where there is a group devoted to Myford lathes. The group is HERE

You will find the info. that you seek but I endorse "Lambton's" advice that you buy the Bradley's Myford Series 7 Manual - lots of useful and relevant information ( Loads of copies available from Amazon from about £4)

Norman

Martin

You disengage the screw thread indicator to save wear. The same reason to disengage the gearbox when not in use.

Screwcutting can be very frustrating and great fun. But i would suggest getting someone to show you how its done first. reading books make it look so difficult.

Check out a few Youtube videos. Almost as good as finding someone to show you.

Check out Youtube Vidios, or be like me, just get stuck in and do it, and it worked, the tool I used was a bit off an old square file( I think it's still in the lathe tool draw). I chose a large thread for a first, 3/4" BSW,(10tpi), a smaller, fine thread is easier.

Ian S C

Edited By Ian S C on 04/11/2015 11:22:37

I cannot see that the wear caused by what is effectively a rack and pinion driving a freely moving indicator spindle is going to be significant. I can fully understand disengaging the gearbox as the loading is many times more significant. In fact if you stick the tumbler gears in neutral the leadscrew doesn't turn and the thread indicator only moves when you track the saddle. Any significant wear is going to come from the saddle handwheel pinion gear. So that why I leave the dial indicator permanently engaged.

Martin

Thanks for the replies I have the myford manual but not sure which is the idle gear is metric 1.5 21 50 45 35idle 40

If anyone must keep their thread dial indicator permanently engaged then ensure it's spindle is lubricated from time to time using the small oiler in the centre of the dial. Better to disengage it when not in use as it serves no purpose to keep it engaged when not screw cutting.

The thread indicator is usually mounted with fibre washers and adjusted to be a firm push to engage or disengage as required.

Mike

Kevin, I don't understand what you're asking in your last post, please could you clarify? Myford "metric" lathes are identical to the imperial ones except that the cross and top slide feed screws are 2 mm pitch. The leadscrew remains 8 tpi.

Kevin,

Perhaps it's more explicit in my S7 manual:

21 driver

50 driven paired with 45 driver on 1st stud

35 as idler on 2nd stud

40 driven on lead screw

HTH

Rod

Martin,

If you read various posts above, people like Lambton have answered your question.

John