Unusual ER Collets

This topic has 12 replies, 6 voices, and was last updated 11 March 2020 at 22:19 by Michael Gilligan.

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10 March 2020 at 14:02 #456452
Manofkent
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@manofkent
I have been clearing out a friends workshop lately.

I came across some unusual ER collets, and wondered if anyone knew what it might be for.

They are ER32 series.

They have only 6 "blades"

The inside diameter is ringed all the way down

It has a cap head bolt and longish nut on the bottom.

Photos of the 16mm size.

many thanks

John
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10 March 2020 at 14:02 #19653
Manofkent
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@manofkent
10 March 2020 at 14:33 #456456
old mart
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@oldmart
The rings in the bore are said to enhance the grip. The threaded end could be used to provide a depth stop, but due to the design, not 100% repeatable.
10 March 2020 at 15:05 #456463
Former Member
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@formermember32069
[This posting has been removed]
10 March 2020 at 17:00 #456484
old mart
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@oldmart
I never would have guessed they were for holding a cutter with a threaded shank, very different from the common threaded shank cutters.
10 March 2020 at 17:03 #456485
Former Member
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@formermember32069
[This posting has been removed]
10 March 2020 at 21:38 #456533
Manofkent
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@manofkent
Thanks for your replies.

The collet is marked "ER" and "SS", as well as the size.

I too had wondered if the cap head screw on the end was to set a dead length, but it has no lockout.

It fits my ER32 collet holder wel

Johnl
11 March 2020 at 07:26 #456560
not done it yet
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@notdoneityet
I too had wondered if the cap head screw on the end was to set a dead length, but it has no lockout.

Likely belt and braces to stop any screwed end mills screwing/unscrewing further? Only two threads would be needed for that – the end mill and the screw.

Or perhaps the collet would not prevent plain-shank cutters from sliding in further under load and the screw may be sufficient to prevent this, even without a locknut as the collet nut will close slightly on tightening, pinching the screw?

As it is only good for one size of cutter, not too useful for work-holding (compared to a full/proper ER collet), I would suggest. For the cost of collets, they would likely be pensioned off if mine (but left in a drawer somewhere!).
11 March 2020 at 07:44 #456562
Michael Gilligan
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@michaelgilligan61133
Posted by Barrie Lever on 10/03/2020 15:05:09:

Schaubulin EFTX, the thread is to hold appropriate cutters. Not for depth stop.

.

Aside from the innocent typo, Barrie is evidently correct ^^^

See here: **LINK**

https://www.practicalmachinist.com/vb/deckel-maho-aciera-abene-mills/more-collet-tallk-time-schaublin-224230/

MichaelG.
11 March 2020 at 10:27 #456586
Neil Wyatt
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@neilwyatt
New one on me Interesting.

Neil
11 March 2020 at 20:05 #456678
old mart
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@oldmart
I would like to see a picture of the cutters designed for these collets.
11 March 2020 at 20:47 #456695
Manofkent
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@manofkent
Thanks for your replies.

In my early days of using ER collets in my milling machine I did notice the milling cutter could slip into the collet holder sometimes, probably I hadn't got the collet properly tightened, but these collets could be a belt and braces approach.

As I said they fit my ER 32 holder, and I have a range of sizes so i will try them out next time i have some milling to do.

And so back to riveting tender hornblocks to the frames on 3.1/2 gauge County Carlow.

John
11 March 2020 at 22:19 #456710
Michael Gilligan
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@michaelgilligan61133
Posted by old mart on 11/03/2020 20:05:57:

I would like to see a picture of the cutters designed for these collets.

.

I would imagine that the collets were designed to accept standard ‘threaded cylindrical shank’ cutters.

MichaelG.
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