Z-Axis Calibration problem?

[untitled86]

When I use G1 Z0 F1200 or G1 Z50 F1200 my printer gets about a foot from the bed and stops.

I'm manually lowering the printer using the controls in Repetier Host then doing a G28 and executing one of the two commands above. No matter how many times I do this, nothing changes. I also increased the Z_HOME_POS a few times, compiled and uploaded but that changed nothing. What am I doing wrong?

EDIT: I've increasd my Z_HOME_POS to 600, still not getting within an inch of the bed but getting closer now.

EDIT2: G1 Z0 F1500 almost touches the bed. I'm stopping here. But I had to increase the Z_HOME_POS to 726. Is this right?

[Polygonhell]

If you do say
G1 Z50 F1200
Then
G1 Z60 F1200

How far does it move, if it's 5mm instead of 10 then you have a newer RAMBO board, apparently the new RAMBO boards support 16x micro stepping and the firmware values are calibrated for 8.
You need to edit configuration.h and double the steps/mm for the axis.

[untitled86]

Thanks, I'm using these values and it seems to be where it should be at Z50 now.

#define DEFAULT_AXIS_STEPS_PER_UNIT {106.666, 106.666, 106.666, 292.0}

[supra89vang]

I'm getting the same issue with it stopping half way. How do I change it so it matches?

[mhackney]

You have to edit configuration.h and double the steps per unit for the 3 axes AND don't forget the extruder! It is configured lower down in the file in the extruder configuration section.

[untitled86]

Thanks, I did forget the extruder. I don't see an extruder section, what is the variable's name?

Right below STEPS_PER_UNIT I do see "DEFAULT_MAX_FEEDRATE {200, 200, 200, 60}" set to but my old STEPS_PER_UNIT was 53.3 and there aren't any other variables with that value.

[supra89vang]

So I changed the the following but I too don't see the extruder conf. section.

#define DEFAULT_AXIS_STEPS_PER_UNIT {106.666, 106.666, 106.666, 292.0} // default steps per unit for rostockmax

Also with this setting when I change the Z_Home_Pos by 10, I get a movement of about 7.0mm.
Isn't it suppose to move 10mm?

[mhackney]

#define EXT0_STEPS_PER_MM 584

In Repetier firmware. It was originally set to 292.

[Polygonhell]

So I changed the the following but I too don't see the extruder conf. section.

#define DEFAULT_AXIS_STEPS_PER_UNIT {106.666, 106.666, 106.666, 292.0} // default steps per unit for rostockmax

Also with this setting when I change the Z_Home_Pos by 10, I get a movement of about 7.0mm.
Isn't it suppose to move 10mm?

The 292.0 is the extruder steps per mm.