My EMC2 parallel port lathe config

Parallel port setup

Output pins ( pc to lathe )
Pin 1. X step
Pin 2. X direction
Pin 3. Digital out 0 (Enable X)
Pin 4. Z step
Pin 5. Z direction
Pin 6. Digital out 1 (Enable Z)
Pin 7. Spindle CW
Pin 8. Spindle CCW
Pin 9. Spindle PWM (currently not in use)
Pin 14. Digital out 2
Pin 16. Digital out 3
Pin 17. Coolant flood

Input pins (Lathe to pc)
Pin 10. Spindle index
Pin 11. Both limit + home X
Pin 12. Both limit + home Z
Pin 13. Estop In
Pin 15. unused Below data is for reference from aquickcnc dot com Step / Direction control information: X-Direction: Pin 2 X-Step: Pin 3 Y-Direction: Pin 4 Y-Step: Pin 5 Z-Direction: Pin 6 Z-Step: Pin 7 Limit Inputs: Pins 10 - 13 E-Stop Switch: Pin 15

Parallel Port pinout for CNC Lathe

Output functions in EMC2

 

Inputs functions in EMC2

CNC I/O requirements

Brown colored fonts are - OUTPUT
Green colored fonts are - INPUT

Spindle:

1. Clock Wise
2. Counter clock wise
3. Spindle index
4. PWM

Axis:

1. Step
2. Direction
3. Enable / Disable (recommended for stepper systems)
4. Home
5. Limits +ve
6. Limits -ve

Others:

1. Coolant Flood
2. Emergency Switch Input
3. Manual pulse generator (MPG)
4. Machine LAMP

Errors and compensation in CNC

1. Backlash
2. Pitch error compensation