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| author | Kevin O'Connor <kevin@koconnor.net> | 2016-12-26 13:15:37 -0500 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2016-12-28 22:38:27 -0500 |
| commit | f46bc0ef046f3848d64666778a304c85bb5439a3 (patch) | |
| tree | 3d9c99d1563466980c186e64e33a73b4128343f7 | |
| parent | 800d53db6ad2fe0051c3d37dae08dc2fb1bff255 (diff) | |
| download | kutter-f46bc0ef046f3848d64666778a304c85bb5439a3.tar.gz kutter-f46bc0ef046f3848d64666778a304c85bb5439a3.tar.xz kutter-f46bc0ef046f3848d64666778a304c85bb5439a3.zip | |
stepper: Change default max_error from 50us to 25us
Change the default compression error window (max_error) from 50us to
25us - it's common for stepper motor drivers to have 30us for their
"pwm fixed off time" and it would be good for the steps to be
scheduled within that time.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
| -rw-r--r-- | docs/Features.md | 11 | ||||
| -rw-r--r-- | klippy/stepper.py | 2 |
2 files changed, 6 insertions, 7 deletions
diff --git a/docs/Features.md b/docs/Features.md index 956caed3..723bc513 100644 --- a/docs/Features.md +++ b/docs/Features.md @@ -7,12 +7,11 @@ compelling features: stepper motor, it compresses those events, transmits them to the micro-controller, and then the micro-controller executes each event at the requested time. Each stepper event is scheduled with a - precision of no less than 50 micro-seconds. The software does not - use kinematic estimations (such as the Bresenham algorithm) - - instead it calculates precise step times based on the physics of - acceleration and the physics of the machine kinematics. More precise - stepper movement translates to quieter and more stable printer - operation. + precision of 25 micro-seconds or better. The software does not use + kinematic estimations (such as the Bresenham algorithm) - instead it + calculates precise step times based on the physics of acceleration + and the physics of the machine kinematics. More precise stepper + movement translates to quieter and more stable printer operation. * Best in class performance. Klipper is able to achieve high stepping rates on both new and old micro-controllers. Even an old 8bit AVR diff --git a/klippy/stepper.py b/klippy/stepper.py index 1c40e6c7..43b541f3 100644 --- a/klippy/stepper.py +++ b/klippy/stepper.py @@ -51,7 +51,7 @@ class PrinterStepper: self.min_stop_interval = (math.sqrt(3.*inv_max_step_accel + jc**2) - math.sqrt(inv_max_step_accel + jc**2)) def build_config(self): - max_error = self.config.getfloat('max_error', 0.000050) + max_error = self.config.getfloat('max_error', 0.000025) step_pin = self.config.get('step_pin') dir_pin = self.config.get('dir_pin') min_stop_interval = max(0., self.min_stop_interval - max_error) |