Was boring 4 holes in 3/4 aluminum today on a Bridgeport with their boring head and the holes were tapered. Quite a bit smaller at the bottom. (no exact dimension but on the order of ten or twenty thou) The cutter was one of a set that has been around for many years
of those brazed carbide tips on a slightly tapered shank, see picture "I hope will show up". :-)
So what can cause this?? I thought "spring" in the bar but then thinks I, the radial force should be no different at the bottom than at the
top. So why??
Here goes an attempt to post a link for a couple pix.


Well the links look OK :-)
SO any Ideas?? I ran a few more passes without changing the setting and they managed to open up but would still like to know WHY.
Thanks.
...Lew...
of those brazed carbide tips on a slightly tapered shank, see picture "I hope will show up". :-)
So what can cause this?? I thought "spring" in the bar but then thinks I, the radial force should be no different at the bottom than at the
top. So why??
Here goes an attempt to post a link for a couple pix.


Well the links look OK :-)
SO any Ideas?? I ran a few more passes without changing the setting and they managed to open up but would still like to know WHY.
Thanks.
...Lew...
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