Nurb Spline / Filter Problem

[johnT]

I am having a problem with the finish cut on a 4 axis Wire EDM program relating to Nurb Splines. I have chained geometry from the customers' DXF file and have the filter on with Tolerance settings of .0001 an Minimum Arc Radius of .0001 and it still will not cut a smooth surface on a 2" dia. half round feature. The bottom dia is .5" larger and offset .5" laterally compared to the top. The finish looks somewhat corrugated like the wire is still following the nurb spline.

I don't think I can change the spline to an arc because it will change the geometry of the part as some of the features are eliptical.

Using version 9 on this program.

Does anyone have any advice on this?

Thanks,

[Guest]

john,can you email me the part and i will take a look at it.

[Guest]

john, i'm working on it.

[Guest]

john, it's on the way.i hope that helps.

[johnT]

DEl,

That helped out alot.

Every day is a learning experience no matter how many years go by. Thanks, john

[Guest]

john, i have had files like that also.usually they have been cmm'd and everything is output as splines.it is impossible to get a smooth surface in that case.glad to help.