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docs: Note the BMG extruder is actually 50:17 and not 3:1 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2021-01-10 10:46:39 -05:00
parent 750c157000
commit 2ae732a13a
2 changed files with 11 additions and 4 deletions
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4
config/printer-tevo-flash-2018.cfg
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@ -53,8 +53,8 @@ step_pin: ar26
dir_pin: ar28
enable_pin: !ar24
microsteps: 16
gear_ratio: 3:1
rotation_distance: 23.050
gear_ratio: 50:17
rotation_distance: 22.598
nozzle_diameter: 0.400
filament_diameter: 1.750
heater_pin: ar10

11
docs/Rotation_Distance.md
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@ -154,8 +154,15 @@ determine the gear_ratio by counting the teeth on the pulleys. For
example, if a stepper with a 16 toothed pulley drives the next pulley
with 80 teeth then one would use `gear_ratio: 80:16`. Indeed, one
could open a common off the shelf "gear box" and count the teeth in it
to confirm its gear ratio. Note that the common "5.18:1 planetary
gearbox" is more accurately configured with `gear_ratio: 57:11`.
to confirm its gear ratio.
Note that sometimes a gearbox will have a slightly different gear
ratio than what it is advertised as. The common BMG extruder motor
gears are an example of this - they are advertised as "3:1" but
actually use "50:17" gearing. (Using teeth numbers without a common
denominator may improve wear leveling as the teeth don't always mesh
the same way with each revolution.) The common "5.18:1 planetary
gearbox", is more accurately configured with `gear_ratio: 57:11`.
If several gears are used on an axis then it is possible to provide a
comma separated list to gear_ratio. For example, a "5:1" gear box