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Update Delta_Calibrate.md

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Clarify delta calibration and geometry.
Provide an idea of a symptom of incorrect X, Y dimensional accuracy and provide a lead towards fixing it.
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Alex Berg 2025-02-23 18:28:40 -06:00 • committed by GitHub
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@ -47,12 +47,16 @@ radius.
In order to perform this calibration the initial delta parameters (arm
lengths, radius, and endstop positions) must be provided and they
should have an accuracy to within a few millimeters. Most delta
printer kits will provide these parameters - configure the printer
with these initial defaults and then go on to run the DELTA_CALIBRATE
command as described below. If no defaults are available then search
online for a delta calibration guide that can provide a basic starting
point.
should have an accuracy to within a few millimeters. Specifically,
ensure your config file has the minimum values specified in the
printer, stepper_a, and delta_calibrate sections, as described in the
kinematics section of the [Config_Reference](https://www.klipper3d.org/Config_Reference.html#common-kinematic-settings).
Most delta printer kits will provide exact values for these parameters
- configure the printer with these initial defaults and then run
the DELTA_CALIBRATE command as described below. If no defaults are available
then search online for a delta calibration guide that can provide a basic starting
point, such as the [RepRap project's Delta Geometry page](https://reprap.org/wiki/Delta_geometry).
During the delta calibration process it may be necessary for the
printer to probe below what would otherwise be considered the plane of
@ -92,6 +96,12 @@ bed. However, it does not attempt to calibrate X and Y dimensional
accuracy. It's a good idea to perform an enhanced delta calibration to
verify dimensional accuracy.
If your X and Y dimensions are incorrect by
more than a few percent, this may indicate an error in the initial
parameters you supplied before running the basic delta calibration.
In that situation, review the parameters and ensure you understand
the geometery behind delta kinematics design.
This calibration procedure requires printing a test object and
measuring parts of that test object with digital calipers.