Topics created by ScaraMan

Can you post your full config.g and the results of M122 and M98 P"config.g"?

Can you check this troubleshooting step please?

https://docs.duet3d.com/User_manual/Connecting_hardware/Temperature_connecting_PT100#troubleshooting

hi
Yes, I have all those documents already, and have used the servos connected with Arduino uno and Arduino due.
I just want to know how can I use them with the Duet wifi ???
a sketch would be appreciated for the connections,
or since I know how to connect them to the Arduino board, is it possible to use the Arduino with the duet wifi ?? if so how ??

Hi
I appreciate your help, thanks.
In order for the servos run, they require 7.4 VDC
I will have to use a drop down converter from 24V TO 7.4
If you have an example of the wiring or a simple sketch , that would be very
Much appreciated

As @Phaedrux says. Serial SCARA has been supported in RepRapFirmware for more than 2 years. I described some of my experiences with running a serial SCARA 3D printer using a Duet and RepRapFirmware at https://miscsolutions.wordpress.com/2017/08/27/converting-the-robotdigg-scara-printer-to-duet-electronics/ and in the preceding and following post.

I would guess that it's due to homing to Z max and the homed height being set with G92 Z190 is not exactly correct?

@ScaraMan said in Nozzle tip is not at correct height before start of print:

What exactly are you doing when you start a print? Running homeall.g, then running print gcode, cancelling, running homez.g, then running the print gcode again?

Your homez.g does not return to absolute positioning. It should be:

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v2.1.3 on Wed Nov 27 2019 02:27:21 GMT-0500 (EST)
G91 ; relative positioning
G1 H2 Z5 F300 ; lift Z relative to current position
G1 H1 Z195.19 F300 ; move Z up until the endstop is triggered
G90 ; absolute positioning
G92 Z190.19 ; set Z position to axis minimum (you may want to adjust this)

Without this, any move in the gcode after this would move in relative mode, until it was turned back to absolute mode.

I don't think you need the G92 Z190.19 at the end of homeall.g and homez.g, as the preceding move is an H1 move, which sets the axis position defined by M208 in config.g ( M208 X300 Y300 Z190.19 S0 ; set axis maxima) when it hits the endstop. But not sure why this would effect the first run of the homeall.g

Also, in the start of your gcode print file:

...
G1 F200 E50 ;extrude 10 mm of feed stock
64 10000
G92 E0 ;zero the extruded length again
...

I think that should be G4 10000. Not sure of the effect of this.

Ian

Edit: @deckingman spotted the same thing!

Hi,

In cases like this you should post the relevant files like your config file, your homing files and the print start code you mentioned.

Frederick

This is the inherent problem with homing to Z max. You're setting the Z0 position based on something that is as far as possible from the actual nozzle tip.

All is not lost though.

You say you don't have a probe, but reprapfirmware has a clever way of letting you probe the bed even without any probing hardware. If you set the probe type to P0 it will allow you to use all of the probe based functionality like G30, G29, etc. And any time the probe hardware would be called into play, you are given a popup window with jog buttons that let you manually move the nozzle to touch the bed surface.

So you may want to look into using that. At least to define the Z0 position.

There are other ways to use a Z max endstop that make measuring the distance between the Z0 position and the Z max endstop trigger a little easier. For instance, I use a macro to automatically set the Z axis travel limit based on the distance of travel from Z0 to the trigger point. The firmware will automatically save the value to config-override.g and load it at boot time. This uses the G1 H3 function. https://duet3d.dozuki.com/Wiki/Gcode#Section_G0_G1_Move

The macro looks something like this:

G90 ; absolute positioning G1 X150 Y150 ; move nozzle to center of bed assuming X and Y are homed M558 P0 ; enables manual probing G31 X0 Y0 Z0.15 ; sets the offsets of the probe to be at the nozzle, plus 0.15mm for your gauge M561 ; clear any bed compensation G30 ; probe the bed to get Z0 ; you will manually jog the nozzle to touch the bed using your gauge and when you hit OK the height will be set to 0.15 mm G1 Z400 H3 ; move the Z axis until the endstop is triggered and then set the M208 Z axis maxima to the height at trigger M500 ; save the M208 height to config-override.g. Make sure you have M501 at the end of config.g to load the saved value at power on.

You can post your current config.g and homing files so we can see what's going on. Perhaps you have an offset adding in somewhere.

HI
My setup for the endstop on the Z axis is similar to Ultimaker 2, the switch is triggered when heatbed reaches max
limit and its at the bottom, when it homes , heat bed lifts according to z max value set in config, and homez and home all.

Could also use a heater pin if one is free. You can even use the PWM to change brightness if they are dimmable.

@ScaraMan said in How to get bed leveling on the duet wifi and other questions:

I want to know how to level the heatbed , I am using 4 adjustable threaded m4 heatbed screws, I cannot seem to find this in the control software.

The screws = Manual leveling, correct? So what you are really looking for is a command or button to run the nozzle to different positions so you can "thickness of a paper" it by adjusting those screws, correct?

Again... a macro.