If my z probe is .5 mm should I be setting my z offset to .5 or -.5? I am using top as the origin/anchor
I have tried at both z offset location both ways and the g code all shows the first pass being above the part.I would have expected if z0 was actaully .5 above the stock and my roughing pass has a .2 step down why would the first pass not be at z-0.7?
@stewart any help on this?
KM offers two Z offsets. One changes the part location in stock and the other changes the origin relative to stock. Are those the two you are referring to? Are you trying to get KM to rewrite gcode output to take into account a Z probe issue? Neither of those settings accomplishes this. The gcode generated takes those offsets into account creates paths that assume your homing / z probe is accurate. I think you’re looking for a post-processing step that changes all gcode coordinates to reflect this probe issue?
My z probe is zeros my machine .5mm above the material. I assumed setting .5 on the Z offset box would cause km to generate gcode that essentially adjusted all Z positions down .5mm
Is that not the case?
If you Z anchor your part to the top of the stock and then use the Origin → Offset Z, it might work the way you expect. I’ve never tested it nor did I intend the origin offset to be used in this way.
Too many Z settings?
In order to cut one pass to .02” below stock bottom I have to set the Z in 3 places correctly along with a correct step down dimension. I am not sure how to improve this or why there are so many settings necessary, but thought I would flag it for consideration….I will flag my setup so this old man can remember how to do it.
workspace_Flat_pattern_of_FLAT_RH_40 (1).kmz (727.9 KB)
you should only have to set it one place. either the z bottom under limits or z bottom on the operation override. you no longer have to match step down. the stepping is now fit to hit the z bottom value if it’s larger than the full Z depth.
I get 2 passes with both of those settings
2 PASS Z BOTTOM OVERRIDE.kmz (690.2 KB)
2 PASS Z BOTTOM LIMIT.kmz (691.2 KB)
the part is 0.02 tall and the z bottom is -0.02 and the step down is 0.03 so the 0.04 delta (top of part to z bottom) is going to lead to at least two cut lines. Kiri uses a linear interpolation algorithm given start and end Z values. it’s designed not to exceed the step down (conservative). if you use a step down of 0.05 or greater you will get a single cut. step downs near to the exact delta from top to bottom may still produce two cuts.
The part is .025 and the step down was .03 so perhaps you are working to two places for the Z offset, when I increase the stepdown I get one pass. Understanding the z offsets and how they relate makes a difference.
Thank you for your time.