Sparky,
It does have physical home and limit switches. 3 micro switches on front of beam nozzle assy that get actuated from dog as focus travels up or down. I found this in a word document in our amada folder on our network, no idea where it came from (probably here) its for different system than ours but very close and may actually work better, ill try it next time. here it is
Amada LC-1212 B-Axis Zero / Homing Reference Procedure
The B-axis is equipped with a memory so that normally it is not needed to reference in
the morning during normal power up. After a battery change, or any other event that
causes the reference to be lost you will need to follow this procedure in the Fanuc 160i or other similar controls.
If B has overtraveled in the + direction and stopped at ~0.830 on the readout, removal of the ballscrew cover on the laser head may be necessary and the servo shaft being turned backwards using a small blade screwdriver in the provide slot on the end of the ballscrew. Typically turning it while watching the on-screen DRO until its ~0.250 less than the overtraveled value and backed off its limit / hard stop.
1. MDI mode
2. [OFFSET SETTING] key
3. <SETTING> soft key
4. Set Parameter Write Enable to 1 then [INPUT] key (Alarm will flash. Ignore or press [CANCEL] and [RESET] if desired)
5. [SYSTEM] then <PARAM> soft key
6. Type 1815 then <NO SCH> soft key
7. Arrow down to highlight B-axis
8. Type 00000000 and press [INPUT]
9. Type 1425 then <NO SCH> soft key
10. Change parameter from 50 to 100, [INPUT]
11. Cycle the control Off then back to On
12. After boot, go to Reference / Zero / Homing mode
13. Hold the B+ button then pressing and holding the adjacent Enable button. Watch the numbers on the Position readout screen. When the numbers and B servo accelerate, release the button. The B light will illuminate
14. MDI mode
15. [SYSTEM] key
16. <PARAM> soft key
17. Type 1815 then <NO SCH> soft key
18. Arrow down to highlight B-axis
19. Type 00100000 and press [INPUT]
20. Cycle the control Off then back to On
21. After boot, go to Reference / Zero / Homing mode
22. Home the B-axis, typically in the negative direction, and in similar manner to #13 above
23. MDI mode
24. [SYSTEM] then <PARAM> soft key
25. Type 1425 then <NO SCH> soft key
26. Change parameter from 100 to 50, [INPUT]
27. [OFFSET SETTING] key
28. <SETTING> soft key
29. Set Parameter Write Enable to 0 then [INPUT] key
Procedure may need to be repeated.
If this was from someone here please take credit, re-posting so it can help others or me years from now.
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