On 21/01/2020 16:33, Jon Elson wrote:
The big advantage of consistent homing is that the limits of machine
travel can be entered in the .ini file.
Then, when you load a file, it IMMEDIATELY informs you if the program
will exceed any travel limit.
It is ENORMOUSLY helpful when making parts that are near the limits of
the machine to be warned before
the spindle even starts that you need to reposition the work.
The code that works out this warning is often wrong, especially if you
use offsets or probing. I find the warning more of a hindrance than a help.
However having soft limits is very useful and I don't like running
machines without them. You know when you run code that if you get
something wrong the machine won't hit it's hard limits. It's also nice
when jogging to home. You can just hold the jog buttons until the
machine stops. On smaller stepper machines you can also do away with
hard limit switches. My plasma for instance just has home switches and
rubber buffers as end stops. Once homed you can't hit the end stops
unless something has gone very wrong (e.g lost steps).
Les
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