Helix bore bug?

[beej]

I just tried my feedmill in the helical bore toolpath and found that it stays up the radius of the cutter.

 

ie. helix bore depth= z-1.75

corner radius on the cutter .118

actual depth of the program was z-1.632

 

if anything I would have thought it would go deeper by the corner radius but I prefer that it just let my choose the depth.

 

Has anyone else seen this?

[?Mark]

tip comp...

[DavidB]

I have not seen this, are you using tip comp?

[3R!< W3NG3R]

I have seen this and it is the tip comp like they said.

[beej]

ohhhhh man do I feeeell dumb.

 

thanks guys

[Colin Gilchrist]

I almost had the tip comp bite me on a pocket toolpath yesterday. Somehow the default operation parameter mysteriously switched to Center comp instead of tip comp. This caused my pocket toolpath to cut .03 deeper than it should have (.03 CR on the tool). Thank god for verify. I cut the part in Verify, saved the STL stock, and set my stock display in MGP to the newly cut STL file. Sure enough, .03 too deep.

[Colin Gilchrist]

Sounds like this might be a bug in the operation defaults. Who uses center comp on pocketing toolpaths by default? I'm going to take a quick peak at our operation defaults library and see what the heck is going on...

[Jack Neelands™]

yikes ...that sounds scary Colin...maybe it was changed when someone was doing a 5 axis curve with the 4th axis locked and using a chain for the toolpath to follow ...that is the only time I change the tip to center so that the tool actually cuts the geometry correctly