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equipment:cnc:mill:maintenance [2024/02/22 15:15] – Homing samp20equipment:cnc:mill:maintenance [2024/11/19 21:42] (current) – external edit 127.0.0.1
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 The touch probe signal ''probe-hw'' is connected to ''motion.probe-input'' through a oneshot pulse generator. This effectively pulse stretches the incoming signal to ensure a clean trigger. The touch probe signal ''probe-hw'' is connected to ''motion.probe-input'' through a oneshot pulse generator. This effectively pulse stretches the incoming signal to ensure a clean trigger.
 +
 +===== Emergency stop =====
 +
 +The emergency stop system is split into a hardware e-stop circuit and a software stop.
 +
 +The hardware e-stop circuit runs at 240V and provides power to the VFD contactor and 48V stepper power supply. This circuit is fed from the following chain:
 +
 +  - Main power NVR switch.
 +  - E-stop button.
 +
 +The software e-stop has a few different sources:
 +
 +  * GPIO from the e-stop button (''estop-button-fault'').
 +  * LinuxCNC internal faults.
 +
 +While the MESA card is configured with an ''estop-relay'' output that would link the software e-stop to the hardware, we have decided not to connect it. The main reason is to allow the VFD active braking to work correctly during a soft e-stop. We may revisit this later, perhaps with a time delay before cutting the relay.
  
 ===== Axis limits and homing ===== ===== Axis limits and homing =====
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 MIN_LIMIT = -(travel_z - (margin*2)) MIN_LIMIT = -(travel_z - (margin*2))
 MAX_LIMIT = 0 MAX_LIMIT = 0
-HOME = MAX_LIMIT - 20+HOME = MAX_LIMIT - 5
 </code> </code>
  
  • equipment/cnc/mill/maintenance.1708614947
  • Last modified: 5 months ago
  • (external edit)