Collet dimension question:

[sasquatch]

My apologies if this is a silly question, but are all ER25 collet "external" dimensions the same?
Thanks in advance.

[Arthur.Marks]

yes.

[Toolguy]

yes.

[TGTool]

Dimensions are called out in a DIN spec so if they aren't the same some manufacturer's QC isn't up to snuff.

[elf]

It depends on which dimension you're talking about. I have several ER11 collets that have the same ID but the overall length is different.

[TGTool]

It depends on which dimension you're talking about. I have several ER11 collets that have the same ID but the overall length is different.

That's interesting. Where's the extra material? Is the long taper just longer, is there more length above the groove or what? And is it what might be just slight manufacturing variance or does it look like a design change for a particular reason?

[sasquatch]

Thanks for the replies, i kinda figured they would be standardized, but plan on purchasing a few more name brand collets to fit in an off shore ER25 collet chuck. Hopefully they fit.

[Arthur.Marks]

It is no question. Any DIN-6499 collet will fit any DIN-6499 chuck provided they are in the same series (i.e. ER16, 20, 25, etc.) There is one other collet type that can be easily confused with DIN-6499 by eye: the "OZ" series. These also have two angles and are designated by similar series numbers (i.e. OZ16, 20, 25, etc.) but are a different spec' altogether than ER types. The OZ collets are DIN-6388 and have a 1:10 taper angle. It is a different angle than ER collets. They are not interchangeable.

Interchangeable "ER" collets include EX (Schaublin), ESX (Schaublin), ET (PCM patented floating collets for tap use), ER-GB (also used for taps - has square engagement slit), RD (Centaur brand)... There are apparently others, but I've only seen them referenced with regards to the other DIN-6499 series compatibility. I've never seen anyone actually call their product by these other types: DR-, BR- and VSAC-.

To go back in history, the original, original, origin for these is the E (high tolerance, no collapsible range) and ES (standard tolerance, collapsible range) first produced by Schaublin in Switzerland. Rego-Fix later added the self-extraction ring and had it designated under the German standards organization, DIN. Thus, they can properly claim to have "invented" the DIN-6499 collet. Rego-Fix henceforth referred to such as "ER".

[sasquatch]

Thanks for the interesting info Arthur, much appreciated.

[elf]

Here's a shot of the two collets:

[big job]

Since we are talking about ER collets, any collet experts know which is compatable with a 3CH monoset. I was told that
ER 32 is the same. So far I been machining my own collets. Monosets are way over priced, and then machining my own
is time consuming. So I guess I'm looking for some kind of ER dimention chart. The above photo looks real close to a 3C
sam

[bborr01]

Kind of hard to tell from the picture if the one on the right is really longer or not when they are sitting on a cushion. Also, I hope that you are blowing all that crap out of those collets before you use them. Not good to use dirty collets. Compressed air will do the trick.

Brian

Here's a shot of the two collets:

[TGTool]

Since we are talking about ER collets, any collet experts know which is compatable with a 3CH monoset. I was told that
ER 32 is the same. So far I been machining my own collets. Monosets are way over priced, and then machining my own
is time consuming. So I guess I'm looking for some kind of ER dimention chart. The above photo looks real close to a 3C
sam

I can't seem to track down the Rego-Fix link to collet specs at the moment. Here is a .pdf from Schaublin. En Francaise I'm afraid by you can read the dimensions from the charts and illustrations.

The ER-32 is 32mm at its major diameter is about 1.249, near enough to 1-1/4" so you can compare that to what you're making. Backside angle is 8 degrees and 30 degrees on the nose.

[RussZHC]

http://www.rego-fix.com/en/home/prod...formation.html

it maybe on their NA site as well (these pages look different than the last time I was "there" but this time I went to the main/home page first instead of just directly to the ER dimension page)