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diff --git a/docs/Manual_Level.md b/docs/Manual_Level.md index f9636932..687fd27c 100644 --- a/docs/Manual_Level.md +++ b/docs/Manual_Level.md @@ -133,3 +133,57 @@ prompt for coarse adjustments directly above each screw position, and once those are accepted, it will prompt for fine adjustments at the additional locations. Continue to use `ACCEPT` and `ADJUSTED` at each position. + +# Adjusting bed leveling screws using the bed probe + +This is another way to calibrate the bed level using the bed probe. To +use it you must have a Z probe (BL Touch, Inductive sensor, etc). + +To enable this feature, one would determine the additional nozzle +coordinates near the screws and add them to the config file. For example, +it might look like: + +``` +[screws_tilt_adjust] +screw1: -5,30 +screw1_name: front left screw +screw2: 155,30 +screw2_name: front right screw +screw3: 155,190 +screw3_name: rear right screw +screw4: -5,190 +screw4_name: rear left screw +horizontal_move_z: 10. +speed: 50. +samples: 3 +sample_retract_dist: 2. +samples_result: median +screw_thread: CW-M3 +``` + +One can indicate the number of times to repeat probe on each screw and +if the value is the median or the average read probe. + +The screw1 is always the reference point for the others, so the system +assumes that screw1 is in the correct height. +Then to use this feature you must preform every time `G28` before +`SCREWS_TILT_CALCULATE` and after bed is probed you get an output like this: +``` +Send: G28 +Recv: ok +Send: SCREWS_TILT_CALCULATE +Recv: // front left screw (Base): X -5.0, Y 30.0, Z 2.48750 +Recv: // front right screw : X 155.0, Y 30.0, Z 2.36000 : Adjust -> CW 01:15 +Recv: // rear right screw : X 155.0, Y 190.0, Z 2.71500 : Adjust -> CCW 00:50 +Recv: // read left screw : X -5.0, Y 190.0, Z 2.47250 : Adjust -> CW 00:02 +Recv: ok +``` +This means that: + + - front left screw is the reference point you must not change it. + - front right screw must be turned clockwise 1 full turn and a quarter turn + - rear right screw must be turned counter-clockwise 50 minutes + - read left screw must be turned clockwise 2 minutes (not need it's ok) + +Repeat the process several times until you get a good level bed, normally when +all adjusts are below 6 minutes. |