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Auto Bed leveling issue

Posted by Ruprect 
Auto Bed leveling issue
June 08, 2014 09:07AM
Hi
Ive just setup auto bed leveling on my I3 however I cant get the print head to go below the Probe offset position.
Ive followed Zenmasters vids on the setup Im pretty sure its configured correctly.
Heres my Config.h

When I issue G28 the head moves to X endstop, then to Y endstop, then moves out to x61, Y78 which is all good according to the config.
Then the Probe extends, Z moves to Z endstop (probe) and then probe retracts. The head stays at that level

When I issue a G29 it probes as its supposed to but remains off the printhead by the offset amount.
here is the gcode output during G29.
SENDING:G29
SENDING:G1 F2000 X95 Y95
Bed x: 50.00 y: 50.00 z: 0.12
Bed x: 150.00 y: 50.00 z: 0.12
Bed x: 150.00 y: 150.00 z: 0.04
Bed x: 50.00 y: 150.00 z: 0.07
Eqn coefficients: a: -0.00 b: -0.00 d: 0.17
planeNormal x: 0.00 y: 0.00 z: 1.00
echo:endstops hit: Z:0.07

Am I missing something here?
It doesn't seem to be resetting my Z0 to take into account the offset.
Is there another setting I need to do?
Or am I supposed to reset Z0 myself in the start G code of my prints? (I wouldnt have thought so)
Re: Auto Bed leveling issue
June 08, 2014 11:02AM
whats you offset on the probe on the z if its not got a minus value then thats may be your problem post your offset values


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Re: Auto Bed leveling issue
June 08, 2014 07:12PM
Quote
chris33
whats you offset on the probe on the z if its not got a minus value then thats may be your problem post your offset values

Value is in the configuration.h file I linked to -6.60
Re: Auto Bed leveling issue
June 11, 2014 05:27AM
Looks like it was rookie mistake.

Turns out that my Z_PROBE_OFFSET_FROM_EXTRUDER value from my config.h file was being ignored as the eprom had a stored value of 0.0 for that constant. As it has stored values for all constants....
Anyhoo sending an M502 (restore factory settings) allowed the new values to be accepted, then an M500 to store them.
Now all is good with the world, my auto bed leveling works a treat.
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