Originally Posted by
Rifle 57
Sorry but when I see guys on the internet talking about .0000000000000000 run out when doing barrel chambers I some times have to throw the BULL-S***T flag out. When most of them are using a 2 or 3 thousand dollar 1000 pound Chi-com lathe that in
most cases has .0005 to .0015 run out in the spindle in the first place.Also when they run the chamber reamer in the barrel after they have done all of the other machining on the barrel first by the time they get to chambering the barrel their set up has most likely moved any way. Run out is run out all lathe spindles have some even a well known $30,000 Clausing tool room lathe is only guarantied to turn to within .0002 run out. And yes I have done my fair share of benchrest chambering and I use a pretty good 3300 lbs lathe that is in real good condition and it has between .0002 and .0003 run out in the spindle and I am doing good to keep most chambers under .0005 run out and I chamber the barrel in the first operation before any thing can move and then I run the chamber on a live center for the remanding operations. I am not trying to start a pissin match on this subject but the facts are what I have seen in the last 20 years of doing machine work. So I will say I am sorry in advance.
Loren