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?

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).


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