Clasp nut trip mechanism, ME 3814, 1987

[Simon CollierParticipant @simoncollier74340]

[Simon CollierParticipant @simoncollier74340]

This article is about stopping the feed of a Myford 7 in a defined spot by tripping the "clasp" nuts, presumably, the half nuts. The trouble is, I can't understand it. The un-named author refers to an original article on the technique by S.U. Belsey in ME Feb, 1960, which I don't have. He says at one point, "screw in the adjuster until the trigger unlatches the clasp nut". There is no trigger that I can see in his drawings or description and I think that bit must be in the original article. Grainy B&W pictures don't help (aren't we spoiled now with colour everything?). Can anyone make sense of this for me?

[Ady1Participant @ady1]

It's in 3058

I have put the article here

[Clive FosterParticipant @clivefoster55965]

You need the original article by S U Belsey to make the trip device. The article you have found describes an adjustable bed stop to trigger the trip mechanism at any point on the bed.

Looking at the pictures I surmise that the device as originally described was triggered by a stiff rod mounted on the apron, pointing towards the headstock, striking some suitable point on the lathe. Probably the threading gearbox. Clearly there are limits as to how long such a rod can be without massively inconveniencing operation of the machine. So the original design is presumably limited to relatively short work that may appropriately be held in chuck or collet for threading.

The adjustable bed stop allows the device to be used further down the bed for threading long work. Obviously such jobs need to be supported by a steady.

Clive

PS  Well thats redundant now as Ady uploaded the article while I was typing.  Still saved me hunting it down.

Edited By Clive Foster on 05/04/2017 09:58:58

Edited By Clive Foster on 05/04/2017 10:06:58

[Simon CollierParticipant @simoncollier74340]

Not redundant at all Clive, as all descriptions are helpful, thanks. And thanks very much Ady for taking the trouble to put up those pages. I have printed them out to study at leisure.

[RobboParticipant @robbo]

"Not redundant at all Clive, as all descriptions are helpful, thanks"

In that spirit :-

A half-nut release mechanism was also described in ME no 4183 (29 Nov 2002).

This was modified in an article in MEW no 96 (Feb/Mar 2004), and a simple version described in MEW no 99 (Scribe a Line) (Jul 2004)

Details available if required.

Edit: these 3 are all for Myford series 7 lathes

Edited By Robbo on 05/04/2017 19:25:21

[Simon CollierParticipant @simoncollier74340]

Robbo, I can't access any of those, but as I have no intention of drilling any holes in my lathe, I don't feel I can ask you to go to any trouble. I read the article Ady scanned with great interest, thanks again.

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