tool mark on bore wall

[T. Boone]

Is their a way to machine a bore with an end mill and not leave a mark where the tool pulls out in the xy plane. There is no z move when the cutter is against the wall. The end mill is a 4 flute carbide with differential helix, 3/4 dia. The bore is 1.6" deep.

 

Thanks

[Quickmike]

ramping on and will help if its not already being done. Maybe an extra pass cutting "0"

[Ron Branch @ Verisurf]

No mark what so ever. Not really. You can try a couple different approaches, but boring it, stopping the bar, orientating the spindle and rapiding out of the hole is the best approach

IMHO.

 

HTH

[ReDEyZZ]

you may have ball-screw backlash issues or servo lag issues if it leaves a mark like that, for sure use arc in and out and try a spring pass just in case it is deflection, otherwise I suspect a machine issue.

 

can you actually feel the mark? or is it only visual?

[PeterM]

Ramp off the cut with a rad only slightly smaller than the bore.

[Mic6]

Sometimes I'll do a .001 - .002 finish pass with lead in-out but also with a few thou of overlap. It sounds like you're interpolating, yes?