Is it the collet or the holder, or both. The Tormach system is to DIN 6499. An ER collet system standard precision according to DIN 6499 is something like 0.0006" at 0.4". Have a look here:
http://www.centaurtools.com/trainingprograms.asp
You have to remember though that you are mounting a collet in a collet, so concentricty can suffer.
I have 3 Tormach holders and a set of collets and they are all equal to or better than DIN 6499. I can't detect any runout in the holder tapers themselves when using a 0.01mm dial gauge.
I would talk to the supplier about a replacement, after you have checked if it is the collet or the holder, if you haven't already.
Regards
Phil
Originally Posted by fc911c  Hi all
I was wondering how your run out is on your ER holder's? I am seeing .002 which I think is quite high. I also ordered a few set screw holders they are better than the ER. The 3/8 has .0005 and the 1/2 has .0015. The small drill chuck has .001 which I think is great. Is this normal or did I get a bad one. I have a ETM ER 40 that are great and figured the ER 20 should be better than the set screw.
Paying $82.00 v/s $20.00 for less accuracy just doesn't cut it.
Thanks
Frank |