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er collets

what's the difference between er.23 and er. 32

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keith hamer04/07/2010 17:09:27
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can any one explain the difference between the various er collet types?
JasonB04/07/2010 17:46:39
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It really all comes down to the overall dia of the collet generally the collets largest dia is 1mm more than the ER size.(largest & smallest are different) 
 
As the size of thecollet goes up so does the max size it can hold eg an ER16 collet has a max capacity of 10mm while an ER 32 has a max of 20mm
 
And there is no such size as ER 23
 
Jason

Edited By JasonB on 04/07/2010 17:47:18

John Hinkley04/07/2010 19:19:33
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Hi, Keith,
 
Not quite sure what you are after,but this link (if it works!) goes to a couple of pages in the Pratt-Burnerd catalogue and will give you the sizes of various ER series collets.  Having said that, they don't tie up with the set I bought with my mill.  Perhaps mine use Chinese mirrimetles!!
 
 
John
 
JasonB04/07/2010 19:31:03
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John there are some collets that are very similar to ERs that some of the imported sets use, sizes are on ARC's site, you may have these
 
 
Jason
John Hinkley04/07/2010 21:02:49
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Jason,
 
Yes.  It certainly looks like these are the ones I've got!  They may be non-standard, but they work OK so I'll stick with them for now.  Pity ARC don't have the ones I'm missing, or I'd snap up a few!
 
John
 
Bogstandard05/07/2010 00:26:10
263 forum posts
John,
 
The Arc Euro collets that Jason has shown you fit the collet sets sold by Chester UK.
 
The first sets shown on this page,
 
 
If you have any missing, maybe a call to Chester UK will help
 
Bogs
Stub Mandrel10/07/2010 21:25:54
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I have one Arc collet. It fits the ER25 collet chuck I wrote up for ME several years ago, as do all but one of several other second hand collets from various sources. As far as I can tell it's on spec.
 
If I was doing it again I'd make the chuck a lot lighter, though thje extra mass makes it excellent for milling cutters.
 
Neil

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