Collet sticking in chuck

[SandgrounderParticipant @sandgrounder]

[SandgrounderParticipant @sandgrounder]

I've got a Myford Lever Action Collet Chuck with it's set of Imperial collets but I thought I'd try one of the ER series MT2 chucks as metric collets are both cheaper and much more easily obtained, for a trial I bought a cheap chuck which fitted and ran well in the lathe, however it was difficult to remove the work from the chuck, I'd remove the locking nut but the collet was still stuck and required a tap with a brass drift to eject it, as I only have two hands, one for the hammer and the other for the drift this meant both the collet and the work springing out and landing in the swarf under the bed, is this because I bought a cheap collet chuck, do more expensive ones automatically loosen when the locking nut is unscrewed?

Thanks for any advice.

John

[Keith LongParticipant @keithlong89920]

John are you fitting the collet in the ER chuck correctly?

If you are then removing the locking nut – not just loosening it – will remove the collet from the chuck as the collet is "captive" in the nut. If when you try to release the collet grip you need to undo the nut sufficiently for the collet to pull forward slightly from the chuck to release whatever it is holding.

Keith

[Brian OldfordParticipant @brianoldford70365]

Are you actually "locking" the collet into the nut before you're inserting the work-piece? The nut should draw the collet out of the body when you unwind the nut.

[JasonBModerator @jasonb]

Look at this to see how the collet should be locked into the nut first.

Check the nut and collet as you may have damaged them

Edited By JasonB on 03/10/2019 10:55:34

[SandgrounderParticipant @sandgrounder]

Thank you all for your very helpful advice which has resulted in me finding the problem, the collet does lock into the nut with a click however it doesn't withdraw the collet, but I found another chuck, a MT3 one, and this nut fits the MT2 one as well, this was assembled the same way and works, I've just tried both a couple of times more and the results the same, the MT2 nut must have a fault, it was just a cheap one but it will suffice now I have a nut that fits.

Thanks for pointing me in the right direction, the Arc Euro page is very good.

Thanks

John

[peak4Participant @peak4]

Posted by Sandgrounder on 03/10/2019 11:17:51:

Thank you all for your very helpful advice which has resulted in me finding the problem, the collet does lock into the nut with a click however it doesn't withdraw the collet, but I found another chuck, a MT3 one, and this nut fits the MT2 one as well, this was assembled the same way and works, I've just tried both a couple of times more and the results the same, the MT2 nut must have a fault, it was just a cheap one but it will suffice now I have a nut that fits.

Thanks for pointing me in the right direction, the Arc Euro page is very good.

Thanks

John

John Ketan also sells Ball Bearing Nuts to replace your damaged plain one; as soon as I tried mine, I realised it was money well spent.

Bill

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