Originally Posted by Vern Smith  I would like to get a general idea as to how much run out is considered normal for ER collets. I did some testing tonight with ER 32 and ER 16 collet holders. I used a .5" carbide blank in the ER 32's and a .25 in the 16's. The ER 32's were fairly consistent at .001 run out at the face of the collet and just a little more 1.25" from the face. The ER 16 were a little better, .005 at the face and once again a little worse 1" from the face.
I swapped around holders, collets, and nuts to get a representative sample. I torqued all the nuts to recommended numbers. I also checked the spindle and it was out .0002 so not a big factor in the evaluation.
Vern |
Vern,
I indicate all tools used in ER collets. I use a best test .0001 indicator on a Starrett inspection indicator base. I made a hard plastic tool to fit nicely around the end mills and drills etc. I then tap them ever so lightly with the plastic tool and a very small jewelers hammer. It usually does not take much to get the tools within .0005 or better.
MC