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docs: added an answer to the FAQ about detecting lost steps (#1265) 

Signed-off-by: christian mock <cm@tahina.priv.at>
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christian mock 2019-02-18 04:35:58 +01:00 committed by KevinOConnor
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docs/FAQ.md
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@ -21,6 +21,7 @@ Frequently asked questions
18. [How do I convert a Marlin pin number to a Klipper pin name?](#how-do-i-convert-a-marlin-pin-number-to-a-klipper-pin-name) 18. [How do I convert a Marlin pin number to a Klipper pin name?](#how-do-i-convert-a-marlin-pin-number-to-a-klipper-pin-name)
19. [How do I cancel an M109/M190 "wait for temperature" request?](#how-do-i-cancel-an-m109m190-wait-for-temperature-request) 19. [How do I cancel an M109/M190 "wait for temperature" request?](#how-do-i-cancel-an-m109m190-wait-for-temperature-request)
20. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software) 20. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software)
21. [Can I find out whether the printer has lost steps?](#can-i-find-out-whether-the-printer-has-lost-steps)
### How can I donate to the project? ### How can I donate to the project?
@ -452,3 +453,21 @@ needed for a software change to take effect.
When upgrading the software, be sure to check the When upgrading the software, be sure to check the
[config changes](Config_Changes.md) document for information on [config changes](Config_Changes.md) document for information on
software changes that may require updates to your printer.cfg file. software changes that may require updates to your printer.cfg file.
### Can I find out whether the printer has lost steps?
In a way, yes. Home the printer, issue a `GET_POSITION` command, run
your print, home again and issue another `GET_POSITION`. Then compare
the values in the `mcu:` line.
This might be helpful to tune settings like stepper motor currents,
accelerations and speeds without needing to actually print something
and waste filament: just run some high-speed moves in between the
`GET_POSITION` commands.
Note that endstop switches themselves tend to trigger at slightly
different positions, so a difference of a couple of microsteps is
likely the result of endstop inaccuracies. A stepper motor itself can
only lose steps in increments of 4 full steps. (So, if one is using 16
microsteps, then a lost step on the stepper would result in the "mcu:"
step counter being off by a multiple of 64 microsteps.)