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ER32 collet use.

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Maurice26/05/2015 00:43:30
455 forum posts
50 photos

Is there a minimum length that can be gripped in an ER32 collet please? I'm an old dog learning new tricks. I'm less concerned about the work moving, than damaging the collet. Also, I wish to purchase a holder to mount the collets on my Myford. RDG Tools and Arctrade Euro both advertise them for around £45. Axminster tools stock one in a wooden box complete with the three screws an a "C" spanner, for just over £100. None of the firms mentioned seem to make any claim as to the standard of accuracy to expect. Has any one any comments please?

Regards Maurice

Thor26/05/2015 06:07:45
1175 forum posts
35 photos

Hi Maurice,

As far as I know the cutting tool (or bar) should preferably be inserted the full length of the collet or at least 2/3 of the length. Here is one website giving info about ER collets and their use.


Simon Collier26/05/2015 07:20:53
320 forum posts
55 photos

You can hold a short length if you put a length of bar of the same diameter of the workpiece in the collet first. I did exactly that an hour ago.


Bill Pudney26/05/2015 07:22:36
436 forum posts
16 photos

I would agree broadly with Thor.

Some of the smaller ER32 collets have the nominal bore size finishing part way through the collet, that is (say) 10mm collet has a length of 10mm diameter maybe half the length (say 20mm) of the collet. I generally try and stick enough material up the spout to at least the end of the nominal size, ....if that makes sense.



mechman4826/05/2015 08:06:05
2588 forum posts
392 photos


Check your link... I tried it & came up with a virus threat...



Johnboy2526/05/2015 08:09:53
249 forum posts
3 photos

Thor... That's a useful site - thanks for that. I've filed it away in my 'Useful info' file.

The info's out there - just got to find it!


Gary Wooding26/05/2015 08:20:48
635 forum posts
153 photos

My Avast (anti-virus) program blocked Thor's site: said it contained malware.

Leo F Byrne26/05/2015 08:24:23
5 forum posts

My AVG programme also kicked in.


KWIL26/05/2015 09:45:48
3165 forum posts
62 photos

The optimum insertion length would be to the full depth of the bore griping surface, noting that some are recessed at the rear, any less a length, although possible, runs 2 risks.

Firstly you may strain the collet because of the lesser engagement length and secondly, you will not get the maximum grip available. You takes your chance.

Anthony26/05/2015 11:44:49
6 forum posts
3 photos

I bought a set of ER25 collets and chuck for my milling machine from RDG at the Harrogate show this year, and as an afterthought also purchased their collet chuck for my Myford Speed 10. The instructions for machining and fitting the two parts of the chuck together are on their website, and are very easy to do. I am as pleased as punch with my purchase, and would definitely use RDG again.

David Colwill26/05/2015 12:16:32
610 forum posts
33 photos

Nod 32 also flags it.


Maurice26/05/2015 13:38:25
455 forum posts
50 photos

Thanks for the feedback gents. Much as I assumed. Just got to decide where to get the nose piece from. Thanks again


Vic26/05/2015 15:12:16
2434 forum posts
12 photos

I've worked on small items with only 5 or 6mm in the collet without any problems. It's worth mentioning that whilst the larger size collets may grip over the full 40mm depth the smaller sizes don't. Taking a random collet from my set the 6-5 collet only grips over 25mm.

KWIL26/05/2015 15:35:11
3165 forum posts
62 photos

The "nose piece" from ARC which includes a bearing to lower the effort required to close and open collets is worth looking at. Much easier.

Maurice26/05/2015 19:59:20
455 forum posts
50 photos

I have just looked at RDG's webpage for the Myford collet chuck. It includes the fitting instructions which say " clean up the backplate, fit the chuck but do not fully tighten the screw. Check the taper for accuracy. If there is a high spot, tap it to correct it. Tighten the screws". Really? What happened to turning the backplate to be a close fit in the register? It does not inspire confidence it the product.

Regards Maurice

Bandersnatch26/05/2015 21:41:40
1489 forum posts
42 photos

I was going to say why not use the Soba type which doesn't use an intermediate backplate but the ER32 version seem to have disappeared off the shelves since I got mine some years ago.

Odd because the ER25 version is still around.

KWIL26/05/2015 22:07:48
3165 forum posts
62 photos

WARCO still have ER32smiley

Bandersnatch26/05/2015 22:34:05
1489 forum posts
42 photos

Don't see it on their website KWIL ... just ER25.

Thor27/05/2015 05:33:19
1175 forum posts
35 photos

I understand the website I linked to raised the antivirus flags for some of you, sorry for that. George, I run AVG myself and didn't get any flags raised when I visited the website, also tried just now, and still no reaction.


Oompa Lumpa27/05/2015 07:05:37
888 forum posts
271 photos

Antivirus software is not perfect, there is no problem with the page (though I do like the screenshot above saying the "threat" had been removed, that is quite funny) your antivirus software probably needs an update.

However, accept everything I say about antivirus with a pinch of salt, I am still apologetic to someone here about this sort of thing though I am usually on the ball.


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