Hi Guys,
I have written a script for all of you that use oil mist spindles.
This py script will time the on and off usage of your spindle and activate the lube pump for a specific amount of time. Then when you close down linuxcnc, a JSON file will be updated with the exact time that has elapsed. making sure you do not over lube your spindle. It will remember how long you last ran your spindle and only start the pump once the allotted lube cycle time has elapsed.
This has been developed for use with a HAAS mill using the Bijur Lubrication system.
I hope it helps someone.
Attachment not found
Hal components needed
Code:
loadrt oneshot count=1
#central lubrication
loadusr -W /home/cnc/linuxcnc/configs/haas_probebasic/lube.py
net lube-run lube.run => hm2_7i95.0.ssr.00.out-02 # your output for the lube pump
net spindle-cw lube.spindle_status <=
.PY is attached but i will paste it here with some explanations
Code:
#!/usr/bin/env python3
import linuxcnc, hal, time, os, json
# File to store cycle state
STATE_FILE = "/home/cnc/linuxcnc/configs/haas_probebasic/lube_pump_state.json" #location of the json file that will automatically be generated
# Initialize HAL component
lube = hal.component("lube")
lube.newpin("run", hal.HAL_BIT, hal.HAL_OUT)
lube.newpin("delay", hal.HAL_BIT, hal.HAL_OUT)
lube.newpin("spindle_status", hal.HAL_BIT, hal.HAL_IN)
lube.newpin("reset", hal.HAL_BIT, hal.HAL_IN)
lube.ready()
# Pump timing settings
PUMP_RUN_DURATION = 10 # Seconds HOW LONG THE PUMP WILL RUN
REST_DURATION = 1800 # 30 minutes (in seconds) HOW LONG THE PUMP CYCLE TIME
# Initialize variables
pump_running = False
resting = False
elapsed_rest_time = 0
remaining_rest_time = REST_DURATION
start_time = None
# Load previous state if exists
if os.path.exists(STATE_FILE):
try:
with open(STATE_FILE, "r") as f:
state = json.load(f)
elapsed_rest_time = state.get("elapsed_rest_time", 0)
resting = state.get("resting", False)
# Ensure remaining rest time continues exactly where it left off
remaining_rest_time = max(0, REST_DURATION - elapsed_rest_time)
if resting:
print(f"Machine restarted. Pump remains in rest mode for {remaining_rest_time:.2f} seconds.")
else:
remaining_rest_time = REST_DURATION # Reset if not previously resting
except Exception as e:
print(f"Error loading state: {e}")
print("Lube system initialized.")
try:
while True:
time.sleep(0.1) # Reduce CPU usage
# Check spindle status
if lube["spindle_status"]:
if not pump_running and not resting:
pump_running = True
lube["run"] = 1
start_time = time.time()
print("Pump running.")
# Stop pump after run duration
if pump_running and (time.time() - start_time >= PUMP_RUN_DURATION):
pump_running = False
resting = True
lube["run"] = 0
lube["delay"] = 1 # Indicate pump resting
start_time = time.time()
print("Pump resting.")
# Handle rest period
if resting:
if lube["spindle_status"]:
elapsed_rest_time += time.time() - start_time
start_time = time.time()
if elapsed_rest_time >= REST_DURATION:
resting = False
lube["delay"] = 0 # Rest complete
elapsed_rest_time = 0
print("Rest complete. Pump ready to run again.")
else:
start_time = time.time() # Pause timer if spindle stops
# Save state periodically
with open(STATE_FILE, "w") as f:
json.dump(
{
"elapsed_rest_time": elapsed_rest_time,
"resting": resting,
},
f,
)
# Handle reset signal
if lube["reset"]:
print("Reset signal received.")
resting = False
elapsed_rest_time = 0
lube["reset"] = 0 # Reset the reset signal
except KeyboardInterrupt:
print("Shutting down lube system.")
lube["run"] = 0
raise SystemExit
