Making the 4 bronze bushings for the Simpson and Shipton was more annoying than it should have been. Since I hadn’t done so in a while, I clocked the Bison 5C collet chuck to under .0005.
Once I had turned the .5’ bronze round to the .436 diameter, I parted that section off and changed to a 7/16” collet.
Even though I rarely do so, I put a DI on the bush and was getting .005 runout. As a check, I replaced the bush with the same diameter pin gauge with the same .005 runout.
So, since the chuck is virtually dead nuts and the pin gauge is round, that left only the collet.
As a check, I mounted the appropriate size pin gauges in one collet size under and one size over.
Both had 0 runout.
Inspecting the collet showed no burrs, junk inside, etc.
It also had no name on it. I’ve built up my collet set from a variety of sources: Ebay, show vendors, on-line stores, etc. Many are Hardinge (used), some are Shars, others are Lyndex-Nikken and a few have no identification. The squares and hex collets are all Hardinge.
Don’t remember ever having an issue. Things that are supposed to be round, are, in fact, round. Holes are centered. Bores are straight.
Just a bad collet.
Given the snow today, I’m sure that there’s no one at Hardinge, but the website was quite happy to take my order for a new Hardinge collet.
It showed out of stock but the website said that a new one would be ground within 48 hours to .001 TIR.
Just saying.
