Our King having his birthday on 27th of april, we all have a day off, so ... hobbytime
Time to do some wiring on the limit switches. But not before going back to the drawingboard aka AutoCad... I included Lloyd's and Dave's tips and remarks. The limit-switches now are mechanically 'protected' bij the CNC's alu frame
Managed to get all of them within a 1mm actuator range from the real physical end-stop. Even tried crashing into them
They all survived
... the Y-minus switch, also note the gray anti resonance cell foam sheet.
... the Y-plus switch, the slot in the table plate doubles as cable guide.
... Y-plus readilly mounted and wired. The switches are wired in NC configuration. Note the extra screw below the switch, giving the desired mechanical strength and that the whole assembly moved a bit to the left, so that the switch lines up with the frame.
... Y-plus, also here an extra screw for stability. This is the only one where the acryllic takes the mechanical force
... X-plus, I cut out a radius to....
... accomodate the caterpillar
Next to that I also removed one link from it and remounted the top-end with a 25mm offset towards X-minus. Now I have full range on X plus no more obstruction by the catepillar.
... and finally the Z-plus. I had to modify this one as well, 'cause I noticed, that the Z-axis bearings were not correctly centered and secured and had shifted upward...
Since the connector to the control box probably will arrive today, I could not yet test the whole system including the homing cycle, I continued to....
... to set-up the Probe plate
All electrics were already done before in the control box, so only thing to do was to connect it. Noticing the very fragile 'hairs' which the chinese call wires, I replaced them with proper ones as well
... included a probing option in GRBLMachine...
... So just connect the probe and press the button
I implemented double-action probing. First running a G38.2, with relatively high feed, then on contact run G38.4 to retract until contact is lost. Both plunge and retract speeds and lengths can be set seperately.
Repeatability is surprisingly good
+- 0.005 mm on 10 subsequent probing cycles
Of course GRBLMachine also reports and handles all exceptions like the tool not reaching the probe etc.
To be continued,