surface undercut.

[tooling]

I have a surface undercut I have been trying to do. I have tried everything I know but still can’t get it. I tried flowline with gouge check off and surface contour with gouge check off. Still can’t get it. I am trying to use a .75 slot cutter. I posted the file on the ftp site in the mcx folder under MAS106m701-undercut. Could any one help me?

[New Job]

bump:

 

I tried to do one last night, could not get it to work either. Luckily I have a fourth axis and could get it that way. There was arecen thread on this maybe thos gentlmen could join in on this and shed some light in here.

 

[Ralph@Faustson]

J,

 

Are you doing this on a 5 axis machine?

[tooling]

just the standard 3 axis vmc.

[Kevin T]

You should be able to do it in surface finish contour. Make sure your step down is small. Min dist is at top of undercut and max just past the bottom of the undercut.

 

Kevin

[Colin Gilchrist]

Tooling,

 

I took a look at your file. Those undercuts will not be easily done with a wheel cutter. It will take a lot of work to do those undercuts because they are multiple surfaces that sweep up in the Z axis. I would stand the block up and get some long ball endmills. You could probably get it to work with flowline, but you will have to drive a single surface at a time. Some re-modeling of the surfaces could also be required.

 

HTH,

 

Colin Gilchrist

The Boeing Company

[tooling]

Thanks Colin.

 

I tried a bunch of stuff to get it to work. My problem is it needs a fairly sharp corner so the ball nose wouldn’t work. I roughed it out with the ball nose now I need to finish it. It is a small part but that area is deep for that size cutter. The pink area is what I need to get finished. Redoing the surface might be the issue. I may have to get out the pencil grinder and files and return to the old school.