@bearer said in add an H4 parameter to G0/G1 for just halt when endstop is hit ?:
@Danal said in add an H4 parameter to G0/G1 for just halt when endstop is hit ?:
(Not asking about Work Coords, or etc. got all that, just asking about how, physically, to probe when Z0 = bottom of stock / top of spoil.)
But if you use work coordinates with known tool lengths you don't have to probe (if the setup is rigid enough). Just set the work coordinates after facing the spoil board.
Agreed! Same thing. The tool face has set the Z0, whether by facing or probing, it is still the lowest point of the tool.
At the same time, this assumes both "no tool wear" and "tool lengths are at least as accurate as probing". Could be true that neither make enough difference to worry about in given setups. For example, much commercial CNC repetitive work chooses to operate this way, and it works great.
Could be true, as in my case with collets but no tool holders, that "known tool lengths" is a non-starter. Probing (or some form of "touching off") at tool change, including start-of-cut, is the only choice. Preserving Z0 from facing the Martyr/Spoil is literally impossible (assuming the stock is cut with a different bit than was used to face the spoil).