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ER Collets

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Terryd11/01/2011 00:20:23
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1946 forum posts
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Hi John Stevenson,
 
I like the idea of the small ER11 chucks to fit in the ER32.  I hadn't seen that before, It seems to give the best of both worlds.
 
Thanks
 
Terry
John Stevenson11/01/2011 00:35:03
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5068 forum posts
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Or a Clarkson Terry,
 
 
 
John S.

Edited By John Stevenson on 11/01/2011 00:36:12

Terryd11/01/2011 01:26:36
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1946 forum posts
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Hi John,
 
Now I'm really confused

Regards

Terry
Chris Banninger11/01/2011 02:22:03
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Posted by KWIL on 10/01/2011 13:46:07:
Chris Banniger, may I suggest you read Rego-Fix's own data sheets as they quite clearly state that you can use the full clamping range, eg put a 12.2 in a 12-13 collet and still maintain concentricity. So there is no need to worry about putting 1/4" in a 6-7mm ER
 
Kwil, of course you can use the full clamping range. You will just notice some inconveniences, like needing several turns of the closer nut to clamp or release. Like loosing some clamping force. Like loosing some of the good runout specs.
 
Why do you think is it, that ER collets are very popular in metric countries and not so in America? In Europe, ER is almost the defacto indutry standard for toolholding.
 
Regarding the clamping force, no matter what collet you look at, they always clamp strongest at the designed diameter. Take a 10 mm collet: it has a bore that is precisely round at 10mm diameter. Only at 10 mm diameter. If you clamp into this collet a tool with a shaft of 9mm (which is within its clamping range) you will not fail to notice by naked eye, that the collapsed bore of the collet only grips the toolshaft at 6 narrow lines. The gap between collet and workpiece looks like a vawy washer. It is easy to see how this greatly reduced contact surface must result in a loss of clamping force.
It also affects runout, runout is specified only at the collets nominal diameter, not at collapsed diameters. Yes double taper collets are better in this regard than single taper collets. In the home shop it may not matter much, but in industry it does. They regard ER collets as consumables, on a machining centre an ER collet may have a life of two weeks before it is tossed. But life is of course greatly reduced if using up the collets clamping range. At home it all does not matter. I am using ER's in my lathe and in the mill since almost 30 years and like ER and still have my first set made by Schaublin and recently bought a second set from HongKong. Both work well for me. It is just good to know the whole story so one can understand the limitations. Chris
 
John Stevenson11/01/2011 09:35:11
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You also now get the choice to buy imperial ER collets that hold the size designated so that answers that question.
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