Lathe ID Profile, straight in, straight out.

[mfeathers]

I'm trying to use a boring bar to make a hole just barely bigger than the bar itself. We set it up on a manual mill to test the idea and we can make the cut. Now I would like to set it up in Fusion 360 for our CNC Lathe. Without manually editing the code, is it possible to get the boring bar to feed straight in, then straight out? I can go straight in but it always wants to retract a bit towards center before pulling out.

I've tried both ways under direction and have zeroed out all my clearances and angles and, it still retracts.

[Steinwerks]

I don't have time to try this myself right now, but try setting the retract distance to something small enough that it will be filtered out by the post, like .00001"

It works for some other toolpaths such as 2D Contour where a profile-sized tool won't go normally and using negative Stock to Leave.

[mike.mattera · Accepted solution]

Maybe I'm looking at this wrong, but couldn't you just place a point off center and use a drilling cycle drill in/out in a straight line.

Or.... Drill on center and just offset your boring bar off center to create the correct diameter?

Not associative to the bore, but a simple enough solution.

I drilled a hole on center and then drilled a hole off center (X1.762mm). It didn't stop the spindle.
N70 G0 X0. Y0.
N75 G43 Z15.24 H3
N85 G0 Z5.08
N90 G98 G81 X0. Y0. Z-12. R3.08 F736.6
N95 G80
N100 G0 Z15.24

(Drill1 2)
N105 G1 X1.762 Y0. F5000.
N110 G0 Z15.24
N120 Z5.08
N125 G98 G81 X1.762 Y0. Z-12. R3.08 F736.6
N130 G80

[mfeathers]

I ended up setting it up as a drilling cycle and manually adjusted the tool offset in the machine. First run on center, took a measurement and offset the difference. Worked really well.