Just got a Bison ER-32 set for my R-8 Bridgeport. Wanted a way to hold a broader range of sizes with less runout. Before doing anything, I chucked up a drill blank and set up the indicator...whoa! it was all over the place.
When I took the retention nut off, I noticed a groove in the bottom of the collet. Lokking at the inside of the nut, there is a sort of "integral washer/shoulder" that is like 1/4" off-center:
I pretty much know the answer, but this is my first experience with ER toolholders: that shouldn't be that way should it? I could send it back, but I want to use it - I was going to turn it concentric to the rest of the nut. Any reason I shouldn't?
I am usually pretty impressed with Bison quality for the price. But this falls into the "how the hell did they miss that?!" category.
Thanks, Wally