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- Sep 22, 2010
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- 7,223
No one answered this question adequately in my opinion, so I am asking it here:
"I chucked up a piece of steel about 7/16" diameter. I took about 0.060 cut and it machined down. When I got to the shoulder (and stopped) it continued to cut deeper into the work.
My theory is this:
While turning, the bit is "pushing" the work inwards. And when the power feed stops, it continues to machining DOWN to the "real" depth.
Is this correct? Is my tool to dull? Maybe the work was chuck too far out?
The cut doesn't seem to cutting (into) the shoulder, but in the direction the crossfeed moves.
Is the metal being pushed, bent while turning, and is my tool bit sort of skating across the surface, only to continue cutting until it reaches it's correct depth?
Where would the flex be coming from? It's a Heavy 10 with a new cross feed screw. Gibs are snug and smooth. Phase ll AXA quick change post, 3/8" tool bit.
I make a cut, stop at the shoulder, it continues to cut (into) the diameter and then stabilizes into a sort of "groove". Then if I move the carriage back, it drags across the work,, scratching/scribing. The I can use the power feed and take another cut - without moving the cross feed. "
What do you guys think?
Thanks,
Nelson
"I chucked up a piece of steel about 7/16" diameter. I took about 0.060 cut and it machined down. When I got to the shoulder (and stopped) it continued to cut deeper into the work.
My theory is this:
While turning, the bit is "pushing" the work inwards. And when the power feed stops, it continues to machining DOWN to the "real" depth.
Is this correct? Is my tool to dull? Maybe the work was chuck too far out?
The cut doesn't seem to cutting (into) the shoulder, but in the direction the crossfeed moves.
Is the metal being pushed, bent while turning, and is my tool bit sort of skating across the surface, only to continue cutting until it reaches it's correct depth?
Where would the flex be coming from? It's a Heavy 10 with a new cross feed screw. Gibs are snug and smooth. Phase ll AXA quick change post, 3/8" tool bit.
I make a cut, stop at the shoulder, it continues to cut (into) the diameter and then stabilizes into a sort of "groove". Then if I move the carriage back, it drags across the work,, scratching/scribing. The I can use the power feed and take another cut - without moving the cross feed. "
What do you guys think?
Thanks,
Nelson