Changes

9.12.2016 - Danny Blanchard: Normally Open (NO) Homing switches installed on X, Y, and Z-axis.  Positive Z-axis stop plate installed to prevent top of spindle from crashing at the top of it's travel.  Each axis has been wired with a 330ohm resistor connected to 5vdc, as seen below (colors are off: X is actually yellow wire, Y blue wire, Z is orange wire, and ground is black wire).  V-wheels and rails all cleaned with a toothbrush: lots of gunk (smooshed wood dust, I believe) on the anodized rails.  Also replaced some twist-nuts with solder/heatshrink connections, but there is still more to do in that regard.

9.12.2016 - Danny Blanchard: Normally Open (NO) Homing switches installed on X, Y, and Z-axis.  Positive Z-axis stop plate installed to prevent top of spindle from crashing at the top of it's travel.  Each axis has been wired with a 330ohm resistor connected to 5vdc, as seen below (colors are off: X is actually yellow wire, Y blue wire, Z is orange wire, and ground is black wire).  V-wheels and rails all cleaned with a toothbrush: lots of gunk (smooshed wood dust, I believe) on the anodized rails.  Also replaced some twist-nuts with solder/heatshrink connections, but there is still more to do in that regard.

The motion control board (GRBLShield, pronounced "girr-ble, gerbil, or garble: whichever you prefer") is currently running GRBL v0.8C, and I'm having some difficulty getting the homing direction invert setting ($18) to produce any change.  Currently the axis move in the positive direction (away from a lower LH zero home) when the $H command is sent, but changing the $18 value from 0 to 1 makes no change.  I'm considering compiling the newest version of GRBL, v0.9J, as the versions since 0.8c have addressed various homing bugs which I believe we're currently experiencing.  So next step is to compile and flash using the Arduino IDE, and go from there.

The motion control board (GRBLShield, pronounced "girr-ble, gerbil, or garble": whichever you prefer) is currently running GRBL v0.8C, and I'm having some difficulty getting the homing direction invert setting ($18) to produce any change.  Currently the axis move in the positive direction (away from a lower LH zero home) when the $H command is sent, but changing the $18 value from 0 to 1 makes no change.  I'm considering compiling the newest version of GRBL, v0.9J, as the versions since 0.8c have addressed various homing bugs which I believe we're currently experiencing.  So next step is to compile and flash using the Arduino IDE, and go from there.

https://lh4.googleusercontent.com/-FhXABwKcb-I/UvMhBLTESlI/AAAAAAAADCI/kfE-f7jkrwc/s800/cnc_limit_switch_c3.png

https://lh4.googleusercontent.com/-FhXABwKcb-I/UvMhBLTESlI/AAAAAAAADCI/kfE-f7jkrwc/s800/cnc_limit_switch_c3.png