On Friday 23 May 2014 22:07:02 EBo did opine And Gene did reply: > Kirk, > > I will let others chime in that are more up to date, but do take a look > at the work that Yishin LiA has done on his LinuxCNC ArtekBranch. I > believe his focus is on the USB connected FPGA-NURBS controller, but I > do remember him talking about getting ridged tapping working at one > point. Since a lot of that work is based off of NURBS, converting a > single-point threading tool from conventional threading to tapered is > as simple as multiplying the NURB control points by their conical > projection... Hmmm... that explanation is about as clear as mud... > Let me try again. If you can base your motion profiles on NURBS, then > it is a simple operation to convert a circle to a thread helix to a > tapered thread helix by a single efficient mathematical > transformation. It may be possible taking this approach to write a > G76 to NURB function whose output is the NURB representation. Just a > thought. > > Hope that helps, > > EBo --
I did a pipe thread like threading job just last week, using G33 with a wrapper. I screwed up the math for the 30 degree advance angle and got what looked like a 45 degree advance, but as it was a 32 tpi thread, the error was tolerable and gave plumb usable results as it matched on both pieces. Having G76 do a pipe thread like taper would be nice, but it already has too many arguments. :) Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE Instantly run your Selenium tests across 300+ browser/OS combos. Get unparalleled scalability from the best Selenium testing platform available Simple to use. Nothing to install. Get started now for free." http://p.sf.net/sfu/SauceLabs _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
