ER40 collet chuck D1-4

[Oompa LumpaParticipant @oompalumpa34302]

John, the "special nut" is about seven squid from Ketan. In the scheme of things this really isn't "yet more money". It is something to make my life a little easier as they don't need Wellie! I would highly recommend them – I have several.

graham.

Edited By Oompa Lumpa on 24/07/2014 22:08:23

[Oompa LumpaParticipant @oompalumpa34302]

THIS article shows you how to make a collet akin to the Jacobs collet. Okay, it isn't the real thing, but it is close and more importantly, it works. Could make a sort of ER40/Jacobs hybrid?

graham.

[jim’Participant @jim11037]

The mention of ARC collet blocks gives me a great idea!!

I've got some ER32 ones, so, i will stick the hex one in the 3 jaw chuck, chuck some 20mm bar in and see what happens when i turn it.

Its only through posting and reading all the advice that i've been able to think of trying the obvious!!

Once again, thank you!!

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Oompa Lumpa on 24/07/2014 22:49:22:

THIS article shows you how to make a collet akin to the Jacobs collet. …

.

Very interesting, Graham … Thanks for sharing that.

… and I do like his final comment

MichaelG.

[jim’Participant @jim11037]

Just tried a 20mm collet in one of the ARC/JS collet blocks.

Yesterday i was turning some 20mm dia stainless (in hard jaws), so same speeds, feeds and same (worn) tip.

Results are good, not even tightened up overly tight, there was no movement and it cut better than in three jaw chuck. I was running about 60 thou cut yesterday, (.120" off dia). in the ER32, 80 thou was if anything easier going.

So, i'll order a D1-4 collet chuck, box of collets and a bearing nut and see how it goes. I remain unsure about a six inch dia hand closer on the nut (for now anyway!)

Once again, i really appreciate the advice, as it got me thinking!!

I'll post my findings when its all up and running

[jim’Participant @jim11037]

ordered, so now i await posty

[John Stevenson 1Participant @johnstevenson1]

It'll work,

Practice beats theory by about 93.8739346 % [ approx ]

[Gary WoodingParticipant @garywooding25363]

In theory, theory and practise are the same, but in practise they're different.

[jim’Participant @jim11037]

Well UPS came today!

Came home from work to a big box of collets and the chuck. I put the chuck on, clocked up less than a thou run, so looking good! I went for the collets that cover up to 30mm and also bought a bearing nut.

First experiment was the 20mm stainless bar, I tightened the collet up with a moderate amount of force, cut well, no problems at all.

Next up I used some 28mm mild steel and just tightened the nut by hand, gave it a tap and was surprised to see the bar solid. So feeling brave i started to machine the bar and it was solid!! The nut even came undone by hand, so looks like the 6" hand collet closer could be the way to go after all.

Big thank you to everyone that gave advice, it really helped.

Special thanks to John and John

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