I've just finished V3 of my new large Delta with heavier 20x40 towers and massive water-jet cut metal bed, 10mm diameter rod arms with mag-ball joints, etc. Lots of other cool refinements for ease of use and precision.
It's working fantastic, zero skew and spot-on dimensions with no adjustments required! Hard to believe actuallly....
I'm still using my old spring-loaded optical-switch z-probe and finished my effector tilt H parameters. I get a pre-autocal error of .171mm and post-cal of .017 so I am VERY pleased. (especially since I'm using v-wheels on the towers for my carriages).
However, when I manually touch down at all my probe points I don't get anything that looks as good as .017mm bed error (I assume RMS).
Here are my offsets going CW around the the circumference of my bed (350mm):
.13,.16,.16,.01,-.16 (these are deviations from the measured center offset which always zero out anyway before each print)
This is a peak-to-peak variation of .32mm and and an RMS of .113 (.05 if I subtract the mean but I'm not sure if I'm calculating this right).aro
My H offsets range are in the 0 to .1 range, worse than I hoped but not too bad for such a large machine,
Do these numbers look reasonable? I still don't see how the reported .017mm bed error is calculated.
It may be impractical but I would like to see .1 pk to pk across the bed for large thin objects. The carriage mounts and effector are CNC and the 1/4" thick bed is super flat.
thanks
Edited 2 time(s). Last edit at 07/21/2018 07:06PM by shadowphile.