New Rambo board configuration?

[truenorthtrader]

hello folks.

Had problems with my Rambo board, they kindly swapped it for me with a 1.1b board.
Everyone at SeemeCnc is just GREAT btw putting it mildly!

I got it unopened is there anything I have to do to it to get it set up that's different than when you buy the kit?
I uploaded the Marlin firmware but having trouble.

I do a G28 and works, put a code G1 Z5 F3000 to start recalibrating it but it goes down slowly, around 1200 rate, AND only goes half way and stops.

My Repetier host is setup the same way it was before with the dimensions etc.

many thanks in advance!
A.

[mhackney]

The 1.1 boards are 16 microstep and the earlier 1.0 are 8 step. So, depending on what you had before, you might need to adjust:
#define DEFAULT_AXIS_STEPS_PER_UNIT {78.7402,78.7402,200*8/3,760*1.1} // default steps per unit for ultimaker

in Marlin. If your old board was 8 micro steps, you need to double the values you have - NOTE the above is taken from a stock Marlin file and are not the correct values for the MAX!

The symptoms you describe are commensurate with a difference of going form 8 to 16 microsteps.

cheers,
Michael

[cambo3d]

to piggyback on what hackney said . this is what to change to as per the firmware comments.

#define DEFAULT_AXIS_STEPS_PER_UNIT {53.333, 53.333, 53.333, 292.0} // 53.333(xyz)/292.0(E) for E for rostockmax with V1.0 RAMBo boards 1/8 stepping

106.666/584.0 for RAMBo 1.1A and later with 1/16 microstepping

[truenorthtrader]

Oh thank you so much guys!!!!!

That's great news doing the calibration now. thank you again!!!
Anthony

[mrbi11]

Oh thank you so much guys!!!!!

That's great news doing the calibration now. thank you again!!!
Anthony

fyi there is a micro step constant in configuation.h now, it can be set lower than 16, in powers of 2.
8 4 2 and 1

=======
Which should not imply I know what microstepping actually does or why one would set it this way or that.
But one can set it now to be independent of the board maximum.

Maybe a kind soul who knows what its for can explain microstepping?

(Thanks for the information about torque!)

[DocHogan]

Oh thank you so much guys!!!!!

That's great news doing the calibration now. thank you again!!!
Anthony

fyi there is a micro step constant in configuation.h now, it can be set lower than 16, in powers of 2.
8 4 2 and 1

=======
Which should not imply I know what microstepping actually does or why one would set it this way or that.
But one can set it now to be independent of the board maximum.

Maybe a kind sole who knows what its for can explain microstepping?

Just a note for anyone looking to increase step resolution with increasingly fine microsteps. For every step increase (i.e. from 16 to 8), stepper motor torque is reduce by half. So, microstep resolution and stepper motor torque are inversely proportional; there will definitely be some diminishing returns when tweaking this value.