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#138 Add the spindle to the homing sequence

open
nobody
None
5
2015-09-03
2015-09-01
andypugh
No

LinuxCNC now supports the M19 command and spindle orient, but there is no built-in way to reset the spindle encoder to index.
It would be useful for LinuxCNC to set an index-enable pin and command a low spindle speed until that pin goes false as an optional part of the homing sequence.
There are ways to do this in HAL and possibly with G-code, but none feel very satisfactory.

Discussion

  • Jeff Epler

    Jeff Epler - 2015-09-03

    What sort of spindle would benefit from this feature? We discussed this informally on #linuxcnc-devel and failed to imagine one.

     

  • andypugh

    andypugh - 2015-09-03

    Any spindle that uses spindle orientation needs the spindle encoder to be zeroed to index before it can be used for orientation. Imagine a spindle that needs to be oriented for a toolchanger. The encoder reads zero at power up,and when the first tool is loaded. The spindle orients to zero, but the encoder isn't really at the index position. Toolchanger crash ensues.

     
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