Set Z-axis manually

Because I experience many problems getting the hight right because of instability of the IR sensor (I'm reading those topics with great interest) I decided to set the Z-axis manually for the time being, just to get printing. However It does not work as I expect.

The procedure I followed:
- M561 (Reset Bed Compensation)
- M556 S100 X0 Y0 Z0 (Reset XYZ asis compensation)
- HOME
- G32 (seems to work fine)
- Raise head by 5 mm
- G1 X100 Y100
- Manually adjust height "paper thick" above the bed
- G92 Z0

Now when I start printing, it prints "in the air"

When I repeat the above procedure and directly after G92 Z0 I ask the machine the position (M114) it says:
"X=100 Y=100 Z=-0.312586 E=0.0000

Why? I just told the machine it was at Z=0 and it did not move since ...

It appears that the bed compensation creates the Z=-0.312586 at pos X100 Y100, because if I omit the G32 in the above procedure it works as expected.

Where am I thinking wrong?

Kind regards,
Leon

You are not doing anything wrong, I've noticed that problem too. I'll take a look at the firmware and see if I can fix it.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Hi Ivperlo

I find the following script very useful, i have replaced my homez.g file (in the sys directory) with it and helps alot with homing Z. After running this the head will be a the first bed compensation point X and Y, and the sensor decided Z, I then move Z down to paper thickness and re-run another G92 Z0.

by the way your problem may be caused by the fact that you can only run G92 Z0 at the first bed compensation point and not at any other location.

Matt

p.s. change my bed comp measurements for yours before using =)

; RepRapPro Ormerod
; Home Z
M561 ; Remove bed compensation
M120 ; Push feedrate & absolute/relative positioning
G91 ; Set relative movement
G1 Z5 F200 ; Move up 5mm
G90 ; set absolute movement
G1 X55 Y0 ; Move to IR reading point
G30 ; Use IR probe to set height
G30 P0 X60 Y20 Z0.0
G30 P1 X60 Y170 Z-0.25
G30 P2 X170 Y170 Z-0.2
G30 P3 X170 Y20 Z0.20 S
G1 X60 Y20 ; Move to the zero compensation position
G1 Z0 F200 ; Move to Z zero position
M121 ; Pop feedrate and absolute/relative positioning

Edited 1 time(s). Last edit at 02/07/2014 12:17PM by iamburny.

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Quote
lvperlo
Why? I just told the machine it was at Z=0 and it did not move since ...

It appears that the bed compensation creates the Z=-0.312586 at pos X100 Y100, because if I omit the G32 in the above procedure it works as expected.

I've just fixed this in my latest firmware. When you run G92 Z0 it really does set Z=0 now. See [forums.reprap.org].

Edited 1 time(s). Last edit at 02/07/2014 06:24PM by dc42.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

well….. all your efforts are all very laudable, applaudable, and martyrdumable, but there are loads of us that just want these machines to work without going through some sort of 3d baptism of fire, It seems (having spoken to RS) that most of these machines work, but for those that do not the product is souring the whole experience. I wish this z probe thing could be solved, i have spent weeks on it, and it still does not work - new motherboard, new instructions, new probe, for me i either want refund, a new kit, or send it to RRP for a look cos there is something seriously wrong here! And I am sure I speak for the silent majority here, we don't care about all the retrospective debugging you guys are pontificating about we just want the product to work!!!!!

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# 500

@rm2014, if you have been having so many problems, why is it that you haven't asked for any help on this forum?

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Hi dc42,

The G92 now works as I would expect.

Thanks a lot!

been doing it direct with Ian

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# 500