Are 7/8" R8 collets worth having?

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shild
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Are 7/8" R8 collets worth having?

Post by shild »

I've found that hogging with cutters that fit my 3/4" collet seems to work best. Could I do better if I got a 7/8" collet and cutters that fit? Or maybe the walls of such a collet are too thin?
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Harold_V
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Re: Are 7/8" R8 collets worth having?

Post by Harold_V »

As you suggested, the walls are quite thin. I use mine only rarely, but it has served well when called upon.

I purchased mine because I had a few 7/8" shank end mills that I could put to use if I could hold them. It has not been used under extreme conditions, so I'll reserve judgment in that regard, but I don't know that I'd recommend one so you could take heavier cuts.

Might be nice to hear from you if you go that direction.

H
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theg8nw
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Re: Are 7/8" R8 collets worth having?

Post by theg8nw »

From my experience I had a contract for drilling and reaming a 3 1/2 deep hole. Drill was 63/64 taper shank drill cut and turned to 7/8" Reamer was 1" carbide tipped with a 7/8" shank. The hole was welded solid with Esab ER70s wire. I would average 125 holes drilled and reamed before I broke a collet. These were done on a manual Bridgeport. I ran over 700 of these parts. I guess I had pretty good luck with a 7/8 collet, But this was just drilling an E/M may put more stress on it.
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Trainman4602
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Re: Are 7/8" R8 collets worth having?

Post by Trainman4602 »

You can get end mills with a reduced shank for 3/4 collet the 7/8 is limited to what end mill you can use. not much depth in the collet.
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SteveM
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Re: Are 7/8" R8 collets worth having?

Post by SteveM »

If the alternative to a 7/8" collet is to put a 3/4" shank 7/8" end mill holder in, then you probably would be better off with the collet, as the overhang will be far less.

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Trainman4602
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Re: Are 7/8" R8 collets worth having?

Post by Trainman4602 »

I guess I don't what I am talking about.
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shild
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Re: Are 7/8" R8 collets worth having?

Post by shild »

Thanks for the replies everyone!
theg8nw wrote: Wed Aug 01, 2018 3:49 am From my experience I had a contract for drilling and reaming a 3 1/2 deep hole. Drill was 63/64 taper shank drill cut and turned to 7/8" Reamer was 1" carbide tipped with a 7/8" shank. The hole was welded solid with Esab ER70s wire. I would average 125 holes drilled and reamed before I broke a collet. These were done on a manual Bridgeport. I ran over 700 of these parts. I guess I had pretty good luck with a 7/8 collet, But this was just drilling an E/M may put more stress on it.
So 125 holes drilled and reamed before it broke huh? Maybe it was tightening the drawbar and loosening all those times that fatigued the thin walls? Guess a 3/4" collet with 3/4 shank would have been better?
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