Collet vs holder run out

Batmanacw said:
If you know what I can expect from an endmill holder then don't stop. Lol!
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No thanks. I'm not interested in making suggestions that are dismissed out of hand without any expression of appreciation. I recommend you buy the tooling and instruments required to do your own tests.
 
davidpbest said:
No thanks. I'm not interested in making suggestions that are dismissed out of hand without any expression of appreciation. I recommend you buy the tooling and instruments required to do your own tests.
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Not worth arguing....
 
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I ordered two Shars r8 endmill holders that promise 0.0004" runout and I'm looking at two er16 collet chucks with r8 shank that promise 0.0002" run out. At $80 each for the collet chuck they will get returned if they don't live up to the guarantee.

My PM835S spindle shows barely a wiggle on the tenths indicator so I know its right.
 
I use Sowa Arbors and face mill holders, I find them to be very well made and accurate. I purchase them through Suncoast Precision Tools. Below is the Sowa R8 Arbor for my 4" face mill, the end mill holders are also very nice.

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Batmanacw said:
I was considering buying some endmill holders to install some of my more used endmills and a couple holders for an edge finder and tap guide.

I only have a few end mill holders. I checked a 3/4" Shars endmill holder I turned down for my annular cutter and it had exactly 0.001" of run out.

I really only want 1/4, 3/8, and 1/2. I end up doing more hogging with smaller endmills than larger anyway.

I checked a 3/8" R8 collet with a carbide endmill and I had 0.0004". I knew the collet would be more accurate but how accurate do I really need?


Assuming a decent quality, what is the practical accuracy limitation on an R8 endmill holder?
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My personal opinion (for R8 end mill holder or 5C collet) is that I can live with .001” TIR, & I would be very happy to work with .0004”.

Consider looking at TMX or Bison products. I think you will end up with about .0006” TIR. Personally, I will not spend money on Chinese tooling. I bought a lot of Shars tooling, & I regret 95+% of the purchases.
 
I ordered an Iscar r8 - er16 collet chuck. I'll probably buy one of the less expensive Sowa collet chucks next pay just to see the difference. I might buy a second set of er16 collets eventually.

It will be nice to set up my endmills or drills ahead of time for repeat operations.

I'd love to figure out the tool z settings on my dro. I can set up a longer tool with the absolute setting with the quill up, then use the quill to touch off a shorter tool and zero the separate quill dro. That covers two tools.
 
The iscar er16 collet chuck runs out 0.00015" with no collet. I'm using I-carbide ultra precision collets. If I just snug up a tool it will come out at 0.0005". If I lightly tap the tool I can easily get to 0.0002" or less. There is something about er16 collets that seems to allow some settling of the collet with a couple well placed taps.
 
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