On 08/08/2017 08:42 PM, Dan Bloomquist wrote:
I have not set homing up on my mill yet, I've been mulling
it over. A switch is not satisfying unless there is a way
to keep from hunting for it, can't imagine...
If you have encoders with index, that can set the home
position to an exact encoder count, there's no sense
in resolving finer than that. This allows you to align the
work coordinates one day, shut down and then come back the
next day and home the machine, and have as accurate an
alignment to the part or fixture as the previous day.
So it occurred to me to us a laser range finder. Then lcnc
would know where the table is without having to move on
boot. It does not have to be accurate like to mm as I
probably never have to mill to the limit switches, and
even then....
So I started to look around out there, this is amazing for
the price:
<http://www.ebay.com/itm/VL53L0X-Time-of-Flight-Distance-Sensor-Breakout-GY-VL53L0XV2-Module-for-Arduino-/201718280643>
10% of range guaranteed? Hmmm, I am NOT impressed by the
specs. So, from a foot away, they guarantee you can resolve
an inch! The mirror would eventually get dirty and result
in reduced accuracy, too.
Jon
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