I understand and accept that the idea is not to have our reamers cutting oversize but please humour me guys, how much oversize, if any would be acceptable?
I ask this because yesterday I tried cutting a chamber on a scrap blank end using a collet chuck in my tailstock to hold the reamer instead of pushing with the dead centre, runout was well under 0.0005" in all parts of the chamber but the chamber mouth was 0.0007" bigger than the reamer. My plan is to use a good quality floating reamer holder in the tailstock which I have on order but until yesterday Ive never had a problem with oversize and it got me thinking, it was ever so slightly discernible to the wiggle test so I measured it.
How good or bad is 0.0007" oversize measured at the chamber mouth and what effect, if any would it have on brass or accuracy?
I ask this because yesterday I tried cutting a chamber on a scrap blank end using a collet chuck in my tailstock to hold the reamer instead of pushing with the dead centre, runout was well under 0.0005" in all parts of the chamber but the chamber mouth was 0.0007" bigger than the reamer. My plan is to use a good quality floating reamer holder in the tailstock which I have on order but until yesterday Ive never had a problem with oversize and it got me thinking, it was ever so slightly discernible to the wiggle test so I measured it.
How good or bad is 0.0007" oversize measured at the chamber mouth and what effect, if any would it have on brass or accuracy?