Im happy with my chambering method now after some experimentation over the last 12 months or so and after reading a lot of the good material here.
I work between 4 point spiders front and back, I taper bore then ream using my back centre to push. Ive used the floating pusher method as well but I find Im getting as good if not better results using the dead centre as my tailstock is very close over the distance Im working, Ive checked and measured in many places.
Anyway, to the point.
Im just not getting as good a results with 5R barrels as I do with 3, 4 or 6 groove barrels. Typically Im getting figures in the 0.0003" TIR or very often less with all other barrels but with 5Rs its always a little more, generally 0.0005" but rarely is it much less. Now I know these are good numbers but I just dont like these 5Rs as I get vibration through the reamer as the unsupported flute is cutting and Im convinced this is what leads to the higher runout. Ive tried reaming at speeds between 70-190rpm with oil flushing between 40-80psi and Ive tried a tight pilot and leaving different amounts of cut for the reamer to take but the results are the same.
I know that 0.0005" is still good and again Im maybe getting too anal about this but is that just the way of the 5Rs and have I got to live with it? Im always much happier when chambering any other barrel as the experience and results are nicer.
I work between 4 point spiders front and back, I taper bore then ream using my back centre to push. Ive used the floating pusher method as well but I find Im getting as good if not better results using the dead centre as my tailstock is very close over the distance Im working, Ive checked and measured in many places.
Anyway, to the point.
Im just not getting as good a results with 5R barrels as I do with 3, 4 or 6 groove barrels. Typically Im getting figures in the 0.0003" TIR or very often less with all other barrels but with 5Rs its always a little more, generally 0.0005" but rarely is it much less. Now I know these are good numbers but I just dont like these 5Rs as I get vibration through the reamer as the unsupported flute is cutting and Im convinced this is what leads to the higher runout. Ive tried reaming at speeds between 70-190rpm with oil flushing between 40-80psi and Ive tried a tight pilot and leaving different amounts of cut for the reamer to take but the results are the same.
I know that 0.0005" is still good and again Im maybe getting too anal about this but is that just the way of the 5Rs and have I got to live with it? Im always much happier when chambering any other barrel as the experience and results are nicer.
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