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- Feb 24, 2018
- Messages
- 1,044
My new ER 32 collets arrived today, about 3 days ahead of the original stated delivery date. It appears that the collet are the exact same brand as the set I got from BangGood, about 1-2 years ago. I had ordered a 11 piece set, they sent a 13 piece set, they sent a 1/16” and a 7/32”, that were not listed on the sale posting.
I check the run out, on 4 of the collets, the ones where I had hardened ground down pins of that size, 1/4”, 3/8”, 1/2” and 9/16”. The combine runout of the collets and the spindle of the 50+ yr old Rockwell milling machine where
1/4” - ~.0007”
3/8” - ~.0007”
1/2” - ~.0009”
9/16” - ~.001 (a tad less than .001”, but a tad more than .0009”)
I had similar reading off of the shanks of new carbide end mills, using both a B&S and Intrepid brand test indicators.
I also checked the runout on the 3/16” collet, using just the shank of a new carbide end mill, it was in the .0015” range, not sure if it’s the collet or the end mill, t was the only 3/16” carbide end mill I had and all of the HSS 3/16” end mills I have have 3/8” shanks.
I check the run out, on 4 of the collets, the ones where I had hardened ground down pins of that size, 1/4”, 3/8”, 1/2” and 9/16”. The combine runout of the collets and the spindle of the 50+ yr old Rockwell milling machine where
1/4” - ~.0007”
3/8” - ~.0007”
1/2” - ~.0009”
9/16” - ~.001 (a tad less than .001”, but a tad more than .0009”)
I had similar reading off of the shanks of new carbide end mills, using both a B&S and Intrepid brand test indicators.
I also checked the runout on the 3/16” collet, using just the shank of a new carbide end mill, it was in the .0015” range, not sure if it’s the collet or the end mill, t was the only 3/16” carbide end mill I had and all of the HSS 3/16” end mills I have have 3/8” shanks.