I’m building my LR4 getting ready to upgrade from LR2.
I really like the x and y endstops being in the bodies, I had to fashion something myself for the LR2 to do that.
However, there are 2 endstops for Z-max, one on each YZ plate. This seems like a good idea until I saw that they aren’t at the same Z-max, one is way higher as it’s riding on the EMT and braces. I think that what I found is that there isn’t a Z-min endstop, but rather an X-min Z-max and a X-max Z-max.
How does the Z get squared, and how does it remember between poweroffs if both aren’t in use. If they are both in use, how does this work?
There is a place for an x max endstop on the core, but you do not need to use it if you use the min. There are edge cases where folks home x to max, but it isnt a typical use case. For the different z max positions, keep in mind that one side runs on a rail and the other does not, so they will, once adjusted properly, level correctly.
You’ve had good answers. I’ll add a bit.
LR4 homes UP to Z max. There’s a deliberate asymmetry because one Y side rides on a tubing rail and the other Y side does not. The difference in locations is all properly accounted for.
Now, having homed to Z max, most users will then set Z zero at the work piece, either using a probe or by manually jogging down to the work piece and setting Z by command.
LR4 should be re-leveled each time you turn it on or cut motor power, because the design can and will drop on a well built machine because it uses motor holding torque to stay level.
Most of us have some kind of blocks we place under the machine when parking it so that it doesn’t crash the router into the bed when not in powered operation.