[jrmach]

don't have V 21
but
I have done a couple times in V 23,,pretty easy once you wrap your head around it.

I am shocked they don't have it.It's been asked about since I have used BoB for 6 years.
I agree with what you say.

[rjmorel]

I followed what jrmach suggested and was able to get it done with mill 3 axis wireframe. I used "other, spiral" to first draw the taper spiral, add enter ,exit lines, then contour spiral, much like above in v21 just different nomenclature I guess. But never would of figured it out w/o you guys help. And I been using BC versions from DOS v14 I think to v27. Thanks rj