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mycnc:height_mapping

3D Height Mapping

ATTENTION: Height mapping is currently in beta testing.

Height mapping allows to correct the G-code program for abnormalities and slight surface variations of the working material by mapping out the height map of the working material prior to beginning the cutting job. This function is extremely useful when dealing with a working surface which might be oriented imperfectly or may have some abnormalities to it, as well as programs which require a high degree of precision.

The function is currently being tested for the X1366M, X1366M4 and X1366M6 profiles. In order to perform the height mapping procedure, do the following:

  • Open the file that you will want to correct for the material variations

  • After opening the file, head to the Map tab on the main screen of myCNC software

  • Select your Segment Length and your XY Grid. Increasing segment length and XY grid will result in less probe points being taken.

  • Select your probe speeds. The probe speed is the speed with which the probe will be moving down from the start of the downward movement to the first contact with the surface. The slow speed is the speed on the rebound, allowing for a more precise measurement of the z-height position on second contact.

  • Select your Lift Height and Bounce Back settings. The Lift Height specifies the z-axis height to which the probe will be lifted between different probing points (safe height). Note that this height is absolute, not relative, so it will raise it TO the position specified in this field in program coordinates, NOT raise the probe BY that amount. The Bounce Back setting specifies the distance the probe retracts after first coming into contact with the working material surface before beginning to move down again.

  • Select whether you want the material to be probed in a Rectangular or a Fill Area pattern. Generally, either of these methods will give similar results:

  • Press the Generate Map button. Note that in order for the map to position itself properly, the X and Y program coordinates must be at zero prior to the map generation step.

  • Press the Run button (this begins the probing process)

  • After the probing program has completed running, press the Apply Map button. The original G-code file that you have loaded in should now be corrected.

  • After the file has been corrected for surface level imperfections, you can press the Run button again to begin the actual job.
  • If you would like to add a manual measurement of a point or a set of points, you can do so by moving the machine to an arbitrary XY location and recording the height there using the Manual Height Probing button. This will add that XYZ point to the existing height array.

  • If you would like to clear the existing generated map (for example, for the purposes of manually recording a set of points without data from the automatic measurements), you can do so using the Clear Map button.

  • If you would like to save the existing map in order to apply it to a G-code file at a later point, you can do so using the Save Map button. The map will be saved in the folder specified in Settings > Config > Technology > Special Purpose > Height Map.

Settings up the probing procedure

The 3D height map .xml file for the X1366M-series profiles is currently available on request (beta testing as of October 2019). In order to set up the profile once you have received the file, do the following:

  • Head into home/.config/myCNC/profiles/X1366M (or X1366M4/M6 if using those) and switch the old x-bottab-left-mill.xml for the new provided file.
  • Head into myCNC Settings > Config > PLC > Hardware PLC and add the M180 procedure if it is not already present.
    • On recent software versions, it can be added by going into PLC > Hardware PLC Templates, selecting M180 (Double touch probing for Height Map) and clicking the Save PLC button in the lower right corner of the screen. After this, head back into PLC > Hardware PLC and press the Save All, Build All and Send buttons to begin the PLC disk reflashing process.
    • On older software versions, add the M180 procedure by manually creating an M180 file in the Hardware PLC section and pasting the following code:
#include pins.h
 
do_probe()
{
  g0moveA(0,4,0-10000); //100 mm down
  timer=200; do{timer--;}while(timer>0);//wait till motion started
  do{
   code=gvarget(6060);
   if (code==0x4d)
    {
      gvarset(9121,1);
      timer=30;do{timer--;}while(timer>0);
      message=PLCCMD_MOTION_BREAK; timer=10;do{timer--;}while(timer>0);
      message=PLCCMD_MOTION_BREAK; timer=10;do{timer--;}while(timer>0);
      exit(99);
    };
  sens=portget(INPUT_PROBE);
  if (sens!=0)
    {
      code=1;
      message=PLCCMD_LINE_STOP; 
      timer=10;do{timer--;}while(timer>0);
    };
  }while (code==0);
  do { code=gvarget(6060); }while(code!=0x4d);//wait till motion finished
};
 
do_rebound()
{
  //speed=gvarget(8254); //
  gvarset(7080,2000);       //
  timer=20;do{timer--;}while(timer>0);
  bounce=gvarget(8256);
  g0moveA(0,4,bounce);  //bounce
  timer=200; do{timer--;}while(timer>0);//wait till motion started
  do { code=gvarget(6060); }while(code!=0x4d);//wait till motion finished
};
 
do_lift()
{
  //speed=gvarget(8254); //
  gvarset(7080,2000);       //
  timer=20;do{timer--;}while(timer>0);
 
  lift_height=gvarget(8257);
  g0moveA(1,4,lift_height); //Lift Height
  timer=200; do{timer--;}while(timer>0);//wait till motion started
  do { code=gvarget(6060); }while(code!=0x4d);//wait till motion finished
};
 
 
main()
{
  message=PLCCMD_TRIGGER4_OFF;
  timer=2;do{timer--;}while(timer>0);
 
  sens=portget(INPUT_PROBE);
  if (sens!=0)
    {
      gvarset(7080,2000); //1000mm/min
      timer=20;do{timer--;}while(timer>0);
      do_rebound();
    };
 
  sens=portget(INPUT_PROBE);
  if (sens==0)
    {
      speed=gvarget(8253); //Probe Speed
      gvarset(7080,speed); //
      timer=20;do{timer--;}while(timer>0);
      do_probe();
    };
 
  do_rebound();
 
  sens=portget(INPUT_PROBE);
  if (sens==0)
    {
      speed=gvarget(8254); //Slow Speed
      gvarset(7080,speed); //
      timer=20;do{timer--;}while(timer>0);
      do_probe();
    };
 
   gvarset(5730,0);
   timer=20;do{timer--;}while(timer>0);
 
   do_lift();
 
   exit(99);
};
  • Note that the probe sensor number is defined in the INPUT_PROBE field which is used in the M180 PLC procedure. This can be changed by going into Settings > Config > PLC > Hardware PLC > pins.h, and switching the default INPUT_PROBE input number to the one used by your particular setup. After assigning a new probe number, do not forget to once again press the Save All, Build All and Send buttons to reflash the disk.

Changelog

2019-10-15: Manual Height Probing and Clear Map buttons have been added. Manual Height Probing allows the user to take a height measurement in some arbitrary point on the working surface, while the Clear Map button allows to delete the current point array and start anew. Save and Open Map buttons should now be stable.

2019-10-07: Save and Open Map buttons are now operational (some stability issues might be present). The generated map point spread is now shown within the software.

2019-10-04: The Save and Open Map buttons do not work yet. These will allow the user to save the created map and to load a previous map to apply to the G-code file.

mycnc/height_mapping.txt · Last modified: 2019/10/21 15:56 by ivan