surface finish contour problem

[HEAVY METAL]

i am machining a 10 der angle on edge of part .i'm using a .250 ball endmill and stepping it down.my problem is the ball endmill does not come completely off the part .does any know a simple way to extend the toolpath a little past the surface.i trie extending the surface,but it won't do it in the direction i want.error comes telling me cannot extend a trimmed surface

 

thanks heavy

[P_Scott]

Heavy Metal,

 

Which side of the surface do you want to extend the toolpath by? If it's at the ends where the toolpath steps down to the next cut, you may be able to use the Tangential Arc and Angle lead off move that's at the bottom of your Gap settings button. This is a good way of getting the tool to go past the edge in the direction of cut. HTH

 

The Tangential moves are only available with Parallel toolpaths. Surface-Contour doesn't have that capability. Instead you could create a secondary surface from the edge curves of the original surface and include the secondary surface with your drive surfaces.

 

[ 12-13-2002, 01:49 PM: Message edited by: Peter Scott ]

[mold100]

If it is just one surf that you can come off,try

to untrim it and use flowline.

[Ying Jiang]

How about use Tool Containment Boundary?

[McRae]

Ying's idea will work well. I have rolled cutters around surface edges using this technique. Use the edge of the surface and select comp to center.

[BernieT]

Also on the 'Gap' settings page you can use Tangential Arc Radius and Tangential Arc Angle to get the toolpath to go beyond the surface. Try 3" and 2 deg for a start.

 

BerTau

[Roger Peterson]

Surface finish contour does not give the option for the tangential arc and line moves in the gap settings. It does give you entry exit arc radius and sweep angle and works quite well. Use a large radius and small sweep angle and you ge sitting pretty.

 

good luck,

[HEAVY METAL]

thanks for the suggestions fellas

 

HEAVY

[dlhughes]

!!!!!!Just draw another surfaces in the area where you are looking to extend. It works well. In fact, you can put your own surfaces anywhre to help extend or act as a containment boundary. I hope I'm not the only one who does this. You can force that tool to go or don't go just about anywhere.!!!!!

 

Danny

[Fig sign]

Dlhughes !

 

You are not THE ONLY ONE!

 

I always like the simple ways .

That`s why I for example most of times set my home position simply by moving the model with translate to the future home position.

The simplest the safest !

[heeler]

You can also unblank the parent surface and then use the contianment boundry on that. Or even retrim the parent surface to a new boundry,edge ect. HTH

 

Glenn