On 08/09/2017 04:16 PM, jeremy youngs wrote:
My ignorance may land my foot in my mouth , but if it has absolute glass
scales and they are being read why is there a need to home?
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Homing gives you at least two advantages. One is that after
homing, the machine limits of travel can be checked against
the MAX_LIMIT and MIN_LIMIT parameters in the .ini file.
When you load a G-code file, or hit run, the program is
checked against the machine limits and will immediately tell
you, before starting the spindle, that the program exceeds
the + or - limits of an axis at line # 1234. This is
immensely helpful, before cutting starts. Nothing like
cutting metal for an hour and then having it run off the end
of the stock! This lets you reposition the work and try
again. This has saved me lots of material and time.
The second advantage is you can home tomorrow after shutting
LinuxCNC down and it restores all the work offsets (touch
off). So, if you left a fixture on the machine, you can
clamp stock in the fixture and machine another part without
having to touch-off to the part or fixture again.
If you have entered screw error compensation values for your
leadscrews, then you have to set the machine position to the
same place every time (that's homing).
Jon
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