Tool path Help

[marknips]

Hi I'm trying to machine the grove for the flat coil in the attached file, 

tooling would be 3/8" Ball nose, the grove is a 3/8"

I'm struggling to find how to just run round the grove say taking 1mm cut at a time, with the right size cutter.

any help will be much appreciated

thanks in advanced

mark   

[seth.madore]

Crude method: Trace

More elegant but complex: Project

 

Neither one of them are 100% there, you'll have to do some tweaking to get it where you want.

 

[HughesTooling]

How about 2d contour? 

Start and end are not quite right though.

The start shape is not a radius so the toolpath goes through the material a small amount. Is the model correct in this area as it's not an arc where the cavity comes out of the block?

For the lead out I've use a 25mm rad could get closer with a bit of experimenting. But this might not be quite right because the leadout will be tangent to the end of the spiral and not actually following the curve.

See attached file.

@seth.madore I used -tool_cornerRadius to set the depth but noticed it is converted to a number and not saved using the parameter, is this correct?