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Klipper3d / klipper

Klipper is a 3d-printer firmware
GNU General Public License v3.0
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Z height after homing #291

Closed Maximuscr31 closed 6 years ago

Maximuscr31 commented 6 years ago

I have got all my motors going the correct way. I converted a Davinci 1.0 to Ramps 1.4. My Z end stop is at the top of the screw axis. If I set it to pin ar 18 it homes the correct direction and end stops activate. Problem is this doesn't put my bed at the right height. It is above my nozzle. If I set the Z to 200 and 200 is the end stop position I need the bed to drop to 193.10 to be perfect. With that being said I have no idea how to make this work or if I am going about this the backwards way. Here is my setup file. I basically need to know how to go about getting it to home to the right height after hitting the end stop. Thanks Brandon

This file contains common pin mappings for RAMPS (v1.3 and later)

boards. RAMPS boards typically use a firmware compiled for the AVR

atmega2560 (though other AVR chips are also possible).

See the example.cfg file for a description of available parameters.

[stepper_x] step_pin: ar54 dir_pin: !ar55 enable_pin: !ar38 step_distance: .0125

endstop_pin: ^!ar3

endstop_pin: ^!ar2 position_endstop: 237 position_max: 237 homing_speed: 5

[stepper_y] step_pin: ar60 dir_pin: ar61 enable_pin: !ar56 step_distance: .0125

endstop_pin: ^!ar14

endstop_pin: ^!ar15 position_endstop: 217 position_max: 217 homing_speed: 5

[stepper_z] step_pin: ar46 dir_pin: ar48 enable_pin: !ar62 step_distance: .000390625 endstop_pin: ^!ar18

endstop_pin: ^!ar19

position_endstop: 193.10 position_max: 200

[extruder] step_pin: ar26 dir_pin: ar28 enable_pin: !ar24 step_distance: .002 nozzle_diameter: 0.400 filament_diameter: 1.750 heater_pin: ar10 sensor_type: NTC 100K beta 3950 sensor_pin: analog13 control: pid pid_Kp: 22.2 pid_Ki: 1.08 pid_Kd: 114 min_temp: 0 max_temp: 260

[extruder1]

step_pin: ar36

dir_pin: ar34

enable_pin: !ar30

heater_pin: ar9

sensor_pin: analog15

...

[heater_bed] heater_pin: ar8 sensor_type: EPCOS 100K B57560G104F sensor_pin: analog14 control: watermark min_temp: 0 max_temp: 130

[fan] pin: ar9

[mcu] serial: /dev/ttyACM0 pin_map: arduino

[printer] kinematics: cartesian max_velocity: 300 max_accel: 3000 max_z_velocity: 5 max_z_accel: 100

"RepRapDiscount 2004 Smart Controller" type displays

[display]

lcd_type: hd44780

rs_pin: ar16

e_pin: ar17

d4_pin: ar23

d5_pin: ar25

d6_pin: ar27

d7_pin: ar29

"RepRapDiscount 128x64 Full Graphic Smart Controller" type displays

[display]

lcd_type: st7920

cs_pin: ar16

sclk_pin: ar23

sid_pin: ar17

KevinOConnor commented 6 years ago

On Wed, Apr 11, 2018 at 03:25:17AM +0000, Maximuscr31 wrote:

I have got all my motors going the correct way. I converted a Davinci 1.0 to Ramps 1.4. My Z end stop is at the top of the screw axis. If I set it to pin ar 18 it homes the correct direction and end stops activate. Problem is this doesn't put my bed at the right height. It is above my nozzle. If I set the Z to 200 and 200 is the end stop position I need the bed to drop to 193.10 to be perfect. With that being said I have no idea how to make this work or if I am going about this the backwards way. Here is my setup file. I basically need to know how to go about getting it to home to the right height after hitting the end stop.

The Z position parameters in the config are all relative to the distance between the nozzle and bed. So, if your endstop is near the nozzle, then the position_endstop should be near zero. If the endstop triggers when the bed is above the nozzle, then you should set both position_endstop and position_min to a negative number (eg, -6.9).

-Kevin

Maximuscr31 commented 6 years ago

Ok. Now that I do that it homes down instead of up towards the nozzle. I found the new master config. How do I use this command to make it chase 0 instead of 200? homing_positive_dir

Maximuscr31 commented 6 years ago

Tried homing_positive_dir: False and it does not affect the direction Tried homing_positive_dir: True and it won't Z home at all. I feel like the problem is glaring me in the face but I don't get it. Thanks for the help Kevin.

akpch commented 6 years ago

I think what Kevin is saying you need to set both position_endstop and position_min to -193.1 It works.

Maximuscr31 commented 6 years ago

This was my last attempt. [stepper_z] step_pin: ar46 dir_pin: ar48 enable_pin: !ar62 step_distance: .000390625 endstop_pin: ^!ar18

endstop_pin: ^!ar19

position_endstop: -6.9 position_max: 200 position_min: -6.9

I took Kevin at that but will try -193.1 and see if it makes a difference.

Maximuscr31 commented 6 years ago

Just tried it with

[stepper_z] step_pin: ar46 dir_pin: ar48 enable_pin: !ar62 step_distance: .000390625 endstop_pin: ^!ar18

endstop_pin: ^!ar19

position_endstop: -193.1 position_max: 200 position_min: -193.1

Still homing the wrong direction. Thanks for the help in advance everyone.

KevinOConnor commented 6 years ago

On Wed, Apr 11, 2018 at 07:14:28PM -0700, Maximuscr31 wrote:

This was my last attempt. [stepper_z] step_pin: ar46 dir_pin: ar48 enable_pin: !ar62 step_distance: .000390625 endstop_pin: ^!ar18

endstop_pin: ^!ar19

position_endstop: -6.9 position_max: 200 position_min: -6.9

It sounds like you also need to invert the polarity of dir_pin, as described in: https://github.com/KevinOConnor/klipper/blob/master/docs/Config_checks.md

-Kevin

Maximuscr31 commented 6 years ago

If I invert the direction then my controls for the z axis in manual mode and probably slicing are backwards. I could change the wiring for my motor but that would still cause the same issue. It sounds like the software isn't capable of homing a z axis with the end stop at the top. I could move my endstop to the bottom but homing everytime I use it 200mm on a lead screw is going to be a nightmare.

KevinOConnor commented 6 years ago

On Thu, Apr 12, 2018 at 02:53:27AM +0000, Maximuscr31 wrote:

If I invert the polarity then my controls for the z axis in manual are backwards. I could change the wiring for my motor but that would still cause the same issue. It sounds like the software isn't capable of homing a z axis with the end stop at the top. I could move my endstop to the bottom but homing everytime I use it 200mm on a lead screw is going to be a nightmare.

I'm not sure what you mean by "my controls for the z axis in manual". If you mean the OctoPrint control window, then go to OctoPrint Settings -> Printer Profiles -> edit -> Axes -> select Invert control for Z.

Homing the Z towards the nozzle is very common - likely the most common setup.

All firmwares measure Z as distance from nozzle to bed, so you have to configure the Z this way.

-Kevin

Maximuscr31 commented 6 years ago

Well that makes sense. I had no idea octoprint could invert axis controls. Thank you so much Kevin. I feel like an idiot but I hope this might help someone else. I will test it in the morning. Thanks again.

hg42 commented 6 years ago

For the software "down" means "lower values". The inversion is caused by moving the bed instead of the nozzle. If you imagine the nozzle would move instead of the bed, everything works like expected. It's like a camera mounted on the bed like it is in some printers. If you invert octoprints axis controls, you might still be confused when directly using Z values (e.g. in slicer start code etc.) or may be some other software (e.g. Android app) that doesn't have this inversion.