3diy
/
klipper
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

docs: Recommend pause of 2 seconds during sensorless homing 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2021-06-08 13:12:19 -04:00
parent 6db40df6af
commit 07004a889d
1 changed files with 17 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
docs/TMC_Drivers.md
View File

@ -258,10 +258,13 @@ After sensorless homing completes the carriage will be pressed against
the end of the rail and the stepper will exert a force on the frame
until the carriage is moved away. It is a good idea to create a macro
to home the axis and immediately move the carriage away from the end
of the rail. It is recommended to set the speed of this subsequent
move so that it lasts at least two seconds (eg, `G1 X40 F1200`) to
ensure the stall flag in the TMC driver is cleared after the move
completes.
of the rail.
It is a good idea for the macro to pause at least 2 seconds prior to
starting sensorless homing (or otherwise ensure that there has been no
movement on the stepper for 2 seconds). Without a delay it is possible
for the driver's internal stall flag to still be set from a previous
move.
It can also be useful to have that macro set the driver current before
homing and set a new current after the carriage has moved away. This
@ -279,11 +282,13 @@ gcode:
{% set HOLD_CUR = driver_config.hold_current %}
# Set current for sensorless homing
SET_TMC_CURRENT STEPPER=stepper_x CURRENT={HOME_CUR} HOLDCURRENT={HOME_CUR}
# Pause to ensure driver stall flag is clear
G4 P2000
# Home
G28 X0
# Move away
G90
G1 X40 F1200
G1 X5 F1200
# Set current during print
SET_TMC_CURRENT STEPPER=stepper_x CURRENT={RUN_CUR} HOLDCURRENT={HOLD_CUR}
```
@ -308,16 +313,15 @@ sensitivity" for each carriage, but be aware of the following
restrictions:
1. When using sensorless homing on CoreXY, make sure there is no
`hold_current` in effect for either stepper during homing.
2. Make sure both the X and Y carriages are near the center of their
rails before each home attempt.
2. While tuning, make sure both the X and Y carriages are near the
center of their rails before each home attempt.
3. After tuning is complete, when homing both X and Y, use macros to
ensure that one axis is homed first, then move that carriage away
from the axis limit using a move that lasts at least two seconds,
and then start the homing of the other carriage. The move away from
the axis helps ensure the stall flag is cleared from both stepper
drivers before starting the next home attempt. It also avoids
homing one axis while the other is pressed against the axis limit
(which may skew the stall detection).
from the axis limit, pause for at least 2 seconds, and then start
the homing of the other carriage. The move away from the axis
avoids homing one axis while the other is pressed against the axis
limit (which may skew the stall detection). The pause is necessary
to ensure the driver's stall flag is cleared prior to homing again.
# Querying and diagnosing driver settings