First couple tries in plastic. (painfully slow - just testing) (and the hole size should be way closer to the inscribed polygon diameter...)
This is the hal component for linuxcnc... WIP use at your own risk.
Code:
// This is a component for Linuxcnc HAL
// Copyright 2020 Sam Sokolik <samcoinc@gmail.com>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
component polygon "Create a spindle synced motion that carves a polygon using eoffset inputs. Assumes positive rotation.";
pin in bit enable;
pin in unsigned numsides=3 "Number of sides in the polygon";
pin in float inscribedradius=1 "inscribed radius of the polygon";
pin in float cutterdiam "cutter diameter";
pin in float eoffsetscale "scale that eoffset is set to.";
pin in float toolang "angle difference between index and actual tool poition";
pin in float spindlepos "Spindle position scaled to 1 per rev";
pin out float spindlerad "Spindle postion in radians";
pin out float polyradius "radious of the polygon at given spindle position";
pin out float xoffset "x offset to send to offset componant";
pin out float yoffset "y offset to send to the offset componant";
pin out signed xeoffset "x eoffset output";
pin out signed yeoffset "y eoffset output";
pin out bit isindex "set index enable only once";
pin io bit indexenable "hooked to index enable of encoder";
function _;
license "GPL";
;;
#include <rtapi_math.h>
#define PI 3.14159265358979323846
float spinang;
float scale;
float spinangoffset;
if (!enable) {
xoffset=0;
yoffset=0;
xeoffset=0;
yeoffset=0;
isindex = false;
return;
}
// only set index enable once
if (enable && !isindex) {
isindex = true;
indexenable = true;
return;
}
// wait for spindle index before actually enabling
if (enable && isindex && indexenable){
return;
}
//convert spinangoffset to ratio.. for adding to spindle pos - plus a couple rotations
//so the spindle position isn't negative
spinangoffset = (toolang/360)+2;
//formual I found is for circumscribed - convert to inscribed - makes more sense.
scale=inscribedradius/cos(PI/numsides);
spinang = ((spindlepos + spinangoffset) - (int)(spindlepos + spinangoffset))*2*PI;
polyradius = (cos(PI/numsides)/cos((fmod(spinang, (2*PI/numsides))-PI/numsides)))*scale-cutterdiam/2;
//actual offsets applied - could be used for offset componant.
xoffset = cos(spinang)*polyradius * -1;
yoffset = sin(spinang)*polyradius;
//counts for use with eoffset functionality
xeoffset = xoffset / eoffsetscale;
yeoffset = yoffset / eoffsetscale;
spindlerad = spinang;
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Non-circular boring. (Linuxcnc fun)
Originally Posted by RCaffin
