Zeroing dials - setting amount of friction 'hold'

Why is a barmaid hot in the middle?

Sorry Mike- was fooling with this. Suggest that you add a little curve in the spring and see where you get. Had a 9180 once- and that cured it. However,I suspect that your spindle and the dial are not concentric. This may account for sticking.

OK Norman

If you have room, three steel balls set into holes 120 degrees apart in the main shaft with small springs behind them, running in an internal groove on the collar feels quite nice.

Spring steel sliding on aluminium doesn't sound good. Can you try to arrange it so that the spring is locked to the aluminium and slides against the steel ?

-adrian

Never mind that - why is a barmaid hot in the middle?

In article , MikeH_QB writes

Mike,

You seem to have got a lot of froth in reply, with one or two useful suggestions.

I don't know whether you have a copy of The Model Engineer's Workshop Manual, by George Thomas - if not, get one, every ME of any pretensions should have a copy. Chapter 15 has a lengthy discussion of cross slide micrometer collars, with various methods of achieving smooth zeroing dials, from simple spring plungers to incredibly sophisticated designs with locks on both feedscrew and collar.

The designs themselves are specifically for ML7 and S7 lathes, but the principles used should be fairly easily transferable to most medium-sized lathes. The ideas can also be used on other feedscrews, such as vertical slides.

David

You appear to have mis-spelt Omphaloskepsis

Peter

Well spotted Peter, should of course have been "Erudition for Lotus Eaters" still won't sell though :-))

Keith

Shouldn't this be taken to avizandum?

"MikeH_QB" schreef in bericht news: snipped-for-privacy@p73g2000hsd.googlegroups.com...

On several occoasions used O-rings and sometimes phosphor-bronze hollowed disks for this purpose. On my nice Herbert Junior surface grinder the heavy indicator dials are friction coupled by an axial adjusting bolt forcing a small steel wedge outward. Dirk

Do they still switch the electric off at midnight there?

Thanks for all the useful replies folks, one or two ideas that I'll look into. David, your suggestion about the George Thomas book sounds promising - I've got a number of 'standard' workshop books, but not just that one. I completely lost the plot in the thread joking about the 'bar-made' though I'm afraid.

All the best Mike

Mike, Oh dear! Why is a bar made hot in the middle? So that you can bend it!

As for George Thomas, the Divine, there are two books- or three but you want the Model Engineers Workshop Manual and you also want 'Workshop Techniques' which is the joining of his earlier Dividing and Graduating and the Universal Pillar Tool. I have most of the Pillar Tool built and have to add the sensitive drilling attachment and the small dividing head described there. Our kind Chris Edwards passed on his kit for something called the Headstock Dividing Attachment- free gratis- and my thanks. In the Workshop Techniques book information is given on the dials described in the Manual.

Again, I have quite a few other GHT items such as a rotary table and rear tool post.

Others will agree that they have also followed 'the words and music'

I am now going off at a tangent- which GHT explains- and concentrating on a fabricated Stent tool and cutter grinder- which mysteriously arrived in my shed.

I am too old for 'barmaids' and now concentrate on frothy dialogue!

Cheers

Norman

Unfortunately no.