I could use some advice

[So not a Guru]

I've got a part that resembles a hood scoop for a car. The sides have an undercut that varies from 1/2° to 1.5°. I tried to use a lollypop cutter in a surface blend toolpath, but it appears that path won't do an undercut. I'm forced by scheduling to program this for our 3-axis.

 

 

The yellow area is what I need to undercut. Does anyone have any suggestions on the best way to cut this might be? It's aluminum & the finished part is about 20" x 14" x 3"

[gcode]

try waterline with gouge check off

[Guest]

With undercuts.....Surface Finish Contour and Surface Finish Flowline are your friends

[JoshC]

if you have multi-axis go with a multi-axis path locked to only 3 axis output. That will give you the most control and power over your undercut milling, otherwise if you do not have Mastercam Multi-axis i would take JParis's advice as a surface fin contour or flowline should handle that nicely.

[So not a Guru]

I'll give contour a try. I can rarely get flowline to do what I want with multiple surfaces.

[So not a Guru]

if you have multi-axis go with a multi-axis path locked to only 3 axis output. That will give you the most control and power over your undercut milling, otherwise if you do not have Mastercam Multi-axis i would take JParis's advice as a surface fin contour or flowline should handle that nicely.

How do I lock it to 3 axis?

[gcode]

How do I lock it to 3 axis?

the drop down in the tool axis page

[So not a Guru]

Thanks guys, surface contour worked fine.