On Thursday 14 March 2019 14:37:16 Curtis Dutton wrote: > Great thanks for the pointers! > > On Thu, Mar 14, 2019 at 1:32 PM Robert Ellenberg <rwe...@gmail.com> wrote: > > Hi Curtis, > > > > There are a few major hurdles to doing rotary axis blending: > > > > 1. Blends between circular motions (that also have motion in > > other axes) are not geometrically possible with the blending > > technique we use (circular > > arc segments), except for some special cases. This IS possible > > with line segments, however. > > 2. The blend arcs are parameterized using arc length; the > > distance in ABC has to be included in the arc length calculation, or > > the blends won't > > match velocities properly with the segments they're blending. The > > current > > TP assumes in many places that "progress" along a segment means > > XYZ motion, > > and UVWABC motion is indirectly tied to this. > > 3. It's difficult to define blend tolerances for ABC motion in a > > useful way. For example, with 4th axis engraving program, the > > effective blend tolerance depends on the diameter of the part. > > > > All that said, a while ago I extended the 2.7 TP to handle 6 linear > > axes (which avoids problem 3, and doesn't try to blend any circular > > motions). The branch is here if you want to try it out: > > > > > > https://github.com/robEllenberg/linuxcnc-mirror/tree/feature/uvw-ble > >nding-2.7 > > > > This might help if you don't actually need rotary axis motion and > > can pretend your 4th axis is linear. > > > > Best, > > Rob
Is this in master? After a major battle getting the mister air thru the cable chain, seriously impeding its bending radii I came to the conclusion I needed bigger as there was zero room left for home and limit switch wiring. Currently it has a couple yards of 18x25 on it. That may not be big enough for the run down the right side it should all go thru, but the next size up is 25x50 and doesn't look like it has snap open covers for easy wire additions. We'll see. Time to go src some did-din. The kitchen is closed tonight on account of illness, I'm sick of cooking. :) It appears the next size up is 18x30 so I ordered a couple meters of that, along with some din rail to tie down some relays and another terminal kit from Hilitchi as I'm nearly out of the sizes that fit into a mesa card. 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> _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
