hepburnman
Aluminum
- Joined
- Feb 20, 2013
- Location
- NJ
Centering a Barrel Using Interapid 0.0001" DTI with 2.75" Point - Cont. w/ Second Vid
Here is the second video where the Interapid DTI's point has been retracted 1" (from the 2.5" spot in the bore) and this would be about where the base of my bullet would be in the case. I've adjusted the spider only here to achieve the centering you see and I've tuned for about zero indicator movement in the grooves/tops of lands.
I am intending to use the Interapid DTI with the 2.75" point, when I finally do cut the chamber this barrel, because even the Mitutoyo 513-504 DTI cannot reach 2.5" into the bore even if I pre-drilled and bored. Once it is centered with the Interapid DTI, and is then pre-drilled and taper-bored, I will switch to the Mitutoyo DTI and at least re-indicate the rear-portion of the throat area that I will be able to reach. My sensitivity now will be 0.0001" rather than ~0.0004" that I had with the Interapid DTI with the 2.75" point. If center-adjustment is found to be needed with the Mitutoyo DTI I will re-bore the barrel as needed before reaming.
Here is the second video where the Interapid DTI's point has been retracted 1" (from the 2.5" spot in the bore) and this would be about where the base of my bullet would be in the case. I've adjusted the spider only here to achieve the centering you see and I've tuned for about zero indicator movement in the grooves/tops of lands.
I am intending to use the Interapid DTI with the 2.75" point, when I finally do cut the chamber this barrel, because even the Mitutoyo 513-504 DTI cannot reach 2.5" into the bore even if I pre-drilled and bored. Once it is centered with the Interapid DTI, and is then pre-drilled and taper-bored, I will switch to the Mitutoyo DTI and at least re-indicate the rear-portion of the throat area that I will be able to reach. My sensitivity now will be 0.0001" rather than ~0.0004" that I had with the Interapid DTI with the 2.75" point. If center-adjustment is found to be needed with the Mitutoyo DTI I will re-bore the barrel as needed before reaming.