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And now: a swing-up tool for internal threads

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Ned Ludd:
Hi Andy,
The Cox one is not the only one of these internal tools, see 
 http://www.model-engineer.co.uk/forums/postings.asp?th=53342#1013705   
for details.
Ned

andyf:
Hi Ned,

Yes, indeed - Chris Stephens and Mike seem to have been working independently on the same idea. Chris posted his first on the ME forum, about a week before Mike:
http://www.model-engineer.co.uk/forums/postings.asp?th=52176&p=3
And John Bogs was designing one, too. Maybe he will have further improvements to suggest in the fullness of time.

The swing-up toolholder, particularly for external threads, seems such a simple concept, and performance reports from those who have made one all seem favourable. Hence, it's surprising that either no-one invented the thing until recently, or that is is an old idea which has been forgotten until Mike re-invented it.

Andy

Ned Ludd:
Hi Andy,
Could well be a case of great minds think alike. Rather like the telephone, two people invented in the same week.

The external swing up holder mechanism is not new, it is in effect the working parts of a shaper, what is new is its use for threading, for which Messrs Cox and Moore deserve the credit. Coxy for the idea and Bogs for bringing it to fruition and making it known to a wider audience. Seems odd that now we have to differentiate between internal and external holders, life was so much simpler when there was only the one. :D
Ned

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