CNC conversion Questions and Linuxcnc

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22 Aug 2017 07:34 #97860 by andypugh

is there some other documentation I missed somewhere?


Possibly this:
linuxcnc.org/docs/2.7/html/man/man9/hostmot2.9.html
It's not the best-formatted of manual pages.
The following user(s) said Thank You: Kermitfrog

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22 Aug 2017 13:33 #97871 by PCW
The Hostmot2 manual page describes the firmware used with LinuxCNC
The filter options are all controlled by setting parameters in LinuxCNCs hal file

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22 Aug 2017 19:05 #97893 by Kermitfrog
Thanks, that gives me s better idea of how things are interconnected.
Still trying to figure out specifics for encoder. I could make an aluminum or plastic wheel with notches and put behind spindle pulley, for lathe but how many notches? And do i need quadrature? Index pulse? does lcnc need direction and acceleration feedback for CSS and threading etc?

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22 Aug 2017 19:14 - 22 Aug 2017 19:21 #97894 by PCW
You need quadrature only if you reverse the spindle during spindle synchronized motion (for rigid tapping etc)

You need index for any spindle synchronized moves (threading etc)

Theoretically you could get away without index with a clever hal component but you
would end up with a volatile index position so could not resume threading etc after a shutdown

Required encoder resolution depends on spindle speed regulation and how slow you need to go
Poor speed regulation or slow speeds require higher encoder resolution

Even a single pulse per revolution will work if the spindle speed variation per turn is small
(large spindle mass, small load variation etc)
Last edit: 22 Aug 2017 19:21 by PCW.

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