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View Full Version : Question about 1" R8 collet



MotorradMike
08-25-2011, 09:45 AM
I just acquired a carbide tipped end mill with a 1" shank because I wasn't thinking.
My collet set goes up to 7/8" but I can get a 1" collet listed as 'light duty'.

Do any of you have such a collet and does it work OK?

Carld
08-25-2011, 10:34 AM
The largest I have is a 7/8" but I remember using a 1" in a shop I worked in. Best I can remember is it was thin and would not be good for heavy use. I think the "light duty" warning is valid.

I suggest you buy a 1" x R8 holder rather than the 1" collet.

bborr01
08-25-2011, 10:40 AM
The largest I have is a 7/8" but I remember using a 1" in a shop I worked in. Best I can remember is it was thin and would not be good for heavy use. I think the "light duty" warning is valid.

I suggest you buy a 1" x R8 holder rather than the 1" collet.

+1.

I have a 1" R8 collet and seldom use it. The reason they are considered light duty is that the 1" tool will be beyond the spindle, whereas a 7/8 or smaller will fit up in the spindle.

A 1" is OK for things like spot facing but I wouldn't recommend milling with it.

Brian

lazlo
08-25-2011, 10:48 AM
+2. The original Bridgeport R8 collet set went up to 3/4". I have the 7/8 and 1", but they have so little point of contact, I wouldn't want to use it for anything with substantial cutting forces.

gwilson
08-25-2011, 11:18 AM
Can you just get an R8 endmill holder? It sticks out beyond the spindle,and has a set screw for holding the end mill in on its flat spot.

I'm not crazy about having the holder stick out beyond the spindle as it is more able to flex,but it may be the only way to use the 1" shank end mill.

Toolguy
08-25-2011, 12:17 PM
I have a 1" R8 that came with some other stuff. I have never figured out a use for it. It is way flimsy. Maybe couterbore, but NOT milling. I have R8 ER40 collets that go up to an inch. That works great. I have R8 end mill holders that go to 1-1/2" with setscrews. Those work good too. I like the smaller ones of those from 5/8 on down more than the big ones. Both my CNC mills are R8 so everything I do is R8 tooling. I've made some pretty heavy cuts with them, but that is usually 3/4 or smaller roughing mill. I don't like to push sideways too hard on the big ones that are hanging down a long way. The 7/8 collets are very thin at the top and sometimes one segment will break off. They work good until they break though.

MotorradMike
08-25-2011, 12:24 PM
Thanks guys.

I think I may have to put this down to a mistake unless I run across a used R8 endmill holder.

I found a new R8 endmill holder for twice the price I paid for the endmill.

Willy
08-25-2011, 02:44 PM
Do what I did and use it as an excuse to buy an ER-40 collet set.;)

Chris S.
08-25-2011, 03:54 PM
Jeff has a reasonably priced set.
http://www.tools4cheap.net/proddetail.php?prod=r8em

Chris S.
08-25-2011, 04:07 PM
Do what I did and use it as an excuse to buy an ER-40 collet set.;)

Jeff has that too. Out of stock though!
http://www.tools4cheap.net/proddetail.php?prod=er40&cat=34

Willy
08-25-2011, 04:18 PM
For a dealer in Ontario, give Accusize Industrial (http://www.accusizetools.ca/)a whirl.

Their current PDF flier has all of the prices listed.

http://www.accusizetools.ca/upfile/Catalog%202010.pdf

MotorradMike
08-25-2011, 06:04 PM
Thanks Willy!

I got the endmill from him actually.
Didn't even think of checking Accusize for a holder. I don't want a set but I'll go for a 1".