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docs: Update Delta_Calibrate.md with probe location bias info 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2019-06-03 11:15:25 -04:00 committed by KevinOConnor
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commit 97adca18c4
1 changed files with 20 additions and 11 deletions
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docs/Delta_Calibrate.md
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@ -14,6 +14,22 @@ tower endstop switches. If one is using Trinamic stepper motor drivers
then consider enabling [endstop phase](Endstop_Phase.md) detection to then consider enabling [endstop phase](Endstop_Phase.md) detection to
improve the accuracy of those switches. improve the accuracy of those switches.
Automatic vs manual probing
===========================
Klipper supports calibrating the delta parameters via a manual probing
method or via an automatic Z probe.
A number of delta printer kits come with automatic Z probes that are
not sufficiently accurate (specifically, small differences in arm
length can cause effector tilt which can skew an automatic probe). If
using an automatic probe then first
[calibrate the probe](Probe_Calibrate.md) and then check for a
[probe location bias](Probe_Calibrate.md#location-bias-check). If the
automatic probe has a bias of more than 25 microns (.025mm) then use
manual probing instead. Manual probing only takes a few minutes and it
eliminates error introduced by the probe.
Basic delta calibration Basic delta calibration
======================= =======================
@ -39,20 +55,13 @@ calibration completes, one can remove this setting from the config.)
There are two ways to perform the probing - manual probing There are two ways to perform the probing - manual probing
(`DELTA_CALIBRATE METHOD=manual`) and automatic probing (`DELTA_CALIBRATE METHOD=manual`) and automatic probing
(`DELTA_CALIBRATE`). Automatic probing utilizes a hardware device (`DELTA_CALIBRATE`). The manual probing method will move the head near
capable of triggering when the toolhead is at a set distance from the the bed and then wait for the user to follow the steps described at
bed. The manual probing method will move the head near the bed and
then wait for the user to follow the steps described at
["the paper test"](Bed_Level.md#the-paper-test) to determine the ["the paper test"](Bed_Level.md#the-paper-test) to determine the
actual distance between the nozzle and bed at the given location. It actual distance between the nozzle and bed at the given location.
is recommended to use manual probing for delta calibration. A number
of common printer kits come with probes that are not sufficiently
accurate (specifically, small differences in arm length can cause
effector tilt which can skew an automatic probe). Manual probing only
takes a few minutes and it eliminates error introduced by the probe.
To perform the basic probe, make sure the config has a To perform the basic probe, make sure the config has a
[delta_calibrate] section defined and run: [delta_calibrate] section defined and then run the tool:
``` ```
G28 G28
DELTA_CALIBRATE METHOD=manual DELTA_CALIBRATE METHOD=manual