h3n3/klipper
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

docs: Add a Rotation_Distance.md document

Browse Source 
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2020-12-13 22:20:52 -05:00
parent 96eba9f2df
commit 5b31080e77
4 changed files with 180 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
docs/FAQ.md
View File

@@ -2,7 +2,7 @@ Frequently asked questions
==========================
1. [How can I donate to the project?](#how-can-i-donate-to-the-project)
2. [How do I calculate the step_distance parameter in the printer config file?](#how-do-i-calculate-the-step_distance-parameter-in-the-printer-config-file)
2. [How do I calculate the rotation_distance config parameter?](#how-do-i-calculate-the-rotation_distance-config-parameter)
3. [Where's my serial port?](#wheres-my-serial-port)
4. [When the micro-controller restarts the device changes to /dev/ttyUSB1](#when-the-micro-controller-restarts-the-device-changes-to-devttyusb1)
5. [The "make flash" command doesn't work](#the-make-flash-command-doesnt-work)
@@ -31,25 +31,9 @@ Frequently asked questions
Thanks. Kevin has a Patreon page at:
[https://www.patreon.com/koconnor](https://www.patreon.com/koconnor)
### How do I calculate the step_distance parameter in the printer config file?
### How do I calculate the rotation_distance config parameter?
If you know the steps per millimeter for the axis then use a
calculator to divide 1.0 by steps_per_mm. Then round this number to
six decimal places and place it in the config (six decimal places is
nano-meter precision).
The step_distance defines the distance that the axis will travel on
each motor driver pulse. It can also be calculated from the axis
pitch, motor step angle, and driver microstepping. If unsure, do a web
search for "calculate steps per mm" to find an online calculator.
Klipper uses step_distance instead of steps_per_mm in order to use
consistent units of measurement in the config file. (The config uses
millimeters for all distance measurements.) It is believed that
steps_per_mm originated as an optimization on old 8-bit
micro-controllers (the desire to use a multiply instead of a divide in
some low-level code). Continuing to configure this one distance in
units of "inverse millimeters" is felt to be quirky and unnecessary.
See the [rotation distance document](Rotation_Distance.md).
### Where's my serial port?