Setting up Cartesian Printer.
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And if your using DC42's excellent Mini IR Sensor then the P parameter should be P500
Doug
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Hi Corexy
dont know so much about this but I found the section "Setting probe parameters" at https://duet3d.com/wiki/Setting_up_automatic_probing_of_the_print_bed very helpful!Thanks very much!
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Yes X0 and Y0
Z2.5 means the trigger height is 2.5mmTest far away from you bed to avoid crashing your nozzle
And trigger height is used to set the offset?
By that I mean if I'm crashing the nozzle I increase the trigger height?
I know it sounds dumb, but I thought the trigger height and offset were 2 different things.
All of this is language/terms I haven't heard used before.
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And if your using DC42's excellent Mini IR Sensor then the P parameter should be P500
Doug
I am, and I will change that. thank you as well.
And that all helped.
Possibly the P500 setting, but I changed the trigger height to 4mm to be safe and it ended up about there.
So now according to the wiki I have to set the height so as to pin a sheet of paper to the bed and enter "G92 Z0".
Will I insert that code just after G31?
I'll clean and level the bed properly before I carry out that step tomorrow.
Cheers again
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see DC42's post in https://www.duet3d.com/forum/thread.php?id=358 which should explain how to determine your Z Param for the G31 line.
Basically home the printer
move the nozzle to the bed using the paper test
send G92 Z0
move the nozzle up 5mm or so
send G30 S-1 to probe the bed read the Z height of either the web IF or PanelDue and note downRepeat a few time to ensure repeatability and you should have found your Z Trigger height (This is actually the height of the nozzle when the probe triggers.)
Hope this helps.
Doug
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This might be a blunder on my part, or a mistake in the config tool, but check this out:
On the lower board, the terminal blocks labelled RTD1 and RTD2 will be temperature measurement channels 200 and 201 respectively.
I entered RTD1 into the config tool and ended up with:
M305 P1 T100000 B4138 C0 R4700 L0 H0 X201 ; Set thermistor + ADC parameters for heater 1 and remap it to channel 201
This might explain why my hot end is reading at 2000degC at room temp??
I'll try changing it to 200 and see what happens.
And yes, that put me with 0.5degC of the bed temp
Which would also mean that David's estimated settings for the bed thermistor were pretty good as well. -
That would make a difference yes
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Regarding G31 P600 X1 Y1 Z2.5 ; Set Z probe trigger value, offset and trigger height:
1. Increasing the probe trigger height (G31 Z parameter) will make a bed crash more likely, because after the probe triggers, the firmware will think it can go down further before it reaches Z=0. You need to measure the trigger height as described in the IR sensor fitting instructions, and use that value.
2. The X and Y parameters are the offsets of the sensor sensitive area (just below the black capacitor) from the nozzle. They get subtracted from the XY coordinates in your bed.g file, so that the sensor is over those points during probing, not the nozzle.
3. You must always use P500 with the IR sensor.
HTH David
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Regarding G31 P600 X1 Y1 Z2.5 ; Set Z probe trigger value, offset and trigger height:
1. Increasing the probe trigger height (G31 Z parameter) will make a bed crash more likely, because after the probe triggers, the firmware will think it can go down further before it reaches Z=0. You need to measure the trigger height as described in the IR sensor fitting instructions, and use that value.
2. The X and Y parameters are the offsets of the sensor sensitive area (just below the black capacitor) from the nozzle. They get subtracted from the XY coordinates in your bed.g file, so that the sensor is over those points during probing, not the nozzle.
3. You must always use P500 with the IR sensor.
HTH David
Thank you. I'll read the wiki a bit more.
Just starting to get my head around it all.
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With my homing I am concerned whether I entered the right information in the config tool.
I am pretty sure I entered "high" for all axis'.
My X and Y limit switches are both in the front/left corner, and I had to reverse/enter a 0 value all 3 drives to get them to home to the right position.
Moving them manually with the paneldue I have to use + movement to move towards the homing position.
Is that correct?
It does seem so according to the wiki (I think), and I just want to be sure before I set the Z home position, which is currently in the right rear corner and I'd like to move it to the center
Here's how I'm set up at the moment:
; Endstops
M574 Z0 S0 ; Define active low and unused microswitches
M574 X2 Y2 S1 ; Define active high microswitches
M558 P1 X0 Y0 Z1 H5 F120 T6000 ; Set Z probe type to unmodulated, the axes for which it is used and the probe + travel speeds
G31 P500 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height; Drives
M569 P0 S0 ; Drive 0 goes forwards
M569 P1 S0 ; Drive 1 goes forwards
M569 P2 S0 ; Drive 2 goes forwards -
Re run the config tool and left the high/low settings at their defaults.
Still had to reverse 2 steppers, but I realize this would be just due to wiring connections.
It now homes Z in the back/left corner, and I'd like to set my Z probe height/offset in the center.
My question is: Do I have the correct high/low settings for my machine which has the limit switches in the front/left corner of the gantry?
If not, could someone show me what changes to make?
I've gone through the wiki but am unsure.
Here's where I'm at now:
; Endstops
M574 Z0 S0 ; Define active low and unused microswitches
M574 X1 Y2 S1 ; Define active high microswitches
M558 P1 X0 Y0 Z1 H5 F120 T6000 ; Set Z probe type to unmodulated, the axes for which it is used and the probe + travel speeds
G31 P500 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height; Drives
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S0 ; Drive 1 goes backwards
M569 P2 S0 ; Drive 2 goes backwards
M569 P3 S1 ; Drive 3 goes forwards -
Edit homez.g and homeall.g to put the probe/hotend where you want it to be for homing.
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Edit homez.g and homeall.g to put the probe/hotend where you want it to be for homing.
Nice!
I was only doing it in homez.g. Didn't realize it had to be done in both.
Could someone confirm my X Y axis high/low settings in my question above please?
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You need to decide where you want X=0 Y=0 to be. That in turn will fix which is the X axis and which is the Y axis. If you choose front left, X will be left-right and Y will be front-back. If you choose rear left then X will be back-front and Y will be left-right.
Having chosen where the origin will be, set the X and Y motor directions so that +X and +Y move the head away from that corner. You may need to swap the X and Y motor connections over to achieve this.
Then use config tool to specify whether each homing switch is at the low or the high end of its axis, to generate the correct M574 command and homing files. You don't need to home to the origin, you can home to zero on some axes and to max on others.
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My understanding is that the standard configuration is that X=left to right, and y=front to back. If that is the case I'd rather keep it that way.
X0 and Y0, by which I assume you mean home/limit switch are in the front/left of the gantry.
It's almost correct…+ve moves X out of the home/corner, and moves the Z/build plate down.
The only problem is Y, which needs -ve to move out the the home/corner.
Is there anything I can change here in config.g that will fix that? Would M574 X1 Y1 S1 do it? nope, doesn't
M574 Z0 S0 ; Define active low and unused microswitches
M574 X1 Y2 S1 ; Define active high microswitches
M558 P1 X0 Y0 Z1 H5 F120 T6000 ; Set Z probe type to unmodulated, the axes for which it is used and the probe + travel speeds
G31 P500 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height; Drives
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S0 ; Drive 1 goes backwards
M569 P2 S0 ; Drive 2 goes backwards
M569 P3 S1 ; Drive 3 goes forwards -
With that configuration, the origin will be at the front left. As your limit switches are also in the front left corner, they are both low end switches. So use M574 X1 Y1 S1.
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With that configuration, the origin will be at the front left. As your limit switches are also in the front left corner, they are both low end switches. So use M574 X1 Y1 S1.
Thank you.
I re ran the config tool and that's what I ended up with.
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Run the temp auto tunes on both the hot end (PT100) and the bed (thermistor).
Hot end:
Gain 895.7, Time Constant 305.4, Dead Time 11.5, Max PWM 1.0, Load Change P5.3, 10.23, D42.6
Bed:
Gain 108.0, Time Constant 554.5, Dead Time 11.0, Max PWM 1.0, Load Change P83.6, 13.81, D641.4
Not sure what it all means, but I'll put it up in case there are any glaring issues there.
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Those figures look OK to me. Now add these M307 commands in config.g:
M307 H0 A108.0 C554.5 D11.0 B0
M307 H1 A895.7 C305.4 D11.5 P0.5I am suggesting the P0.5 for the hot end to slow down heating, because your hot end heater is so powerful. The B0 for the bed is to switch to PID mode, which should give you better temperature control.
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Those figures look OK to me. Now add these M307 commands in config.g:
M307 H0 A108.0 C554.5 D11.0 B0
M307 H1 A895.7 C305.4 D11.5 P0.5I am suggesting the P0.5 for the hot end to slow down heating, because your hot end heater is so powerful. The B0 for the bed is to switch to PID mode, which should give you better temperature control.
Nice one.
That brought the 2 temps within 0.2-0.3 degC of each other.
