New build issues

Finished building my i3 rework this weekend.
First issue
My motors are having a grinding noise and I don't know why.
2nd issue my extruder motor isn't working.
I have noticed while sliding the axis's that they move not as smooth as I'd like. So far I loosened the x axis nuts to re adjust and nothing. It still slides the same.

I've checked voltage from psu and am reading 12.3 volts.
Checked my connection to the extruder motor and is good.

I'm using marlin as firmware. Selected 33 as my motherboard. I got the lcd12684 working and was navigating through it and on the laptop.
Any help would be much appreciated.

I thought about just getting new printed parts and rods but I'm almost 100% positive mine are straight.

Motors grinding: vref on your steppers not set right, max accelaration or speed in marlin too high.
Extrudermotor not working: there is a prevention in marlin for cold extrusion set this temp lower than the roomtemp. Edit: do this only for testing.

Edited 2 time(s). Last edit at 11/17/2014 04:06PM by gforce1.

Ok. Thanks. I'll look. This is in the config.h file correct? Come to find out I got the wrong couplings. They are 5x8 not 5x5. No biggy. I'll order some and in the meantime I'll use flex hose for the 5mm rod.

if you are using ramps (motherboard == 33) then current settings for motor are on the ramps boards pots..

read here on how to do this [reprap.org]

and acceleration settings are in the config.h

Edited 1 time(s). Last edit at 11/17/2014 03:43PM by jamesdanielv.

got a few bad bearings. t

ok, I have my vref set to .40v
I have these steppers:
[www.ebay.com]
I cant get the axis' to move good at all. just some grinding noises still.
this is what is in config:
//// MOVEMENT SETTINGS
#define NUM_AXIS 4 // The axis order in all axis related arrays is X, Y, Z, E
#define HOMING_FEEDRATE {50*60, 50*60, 4*60, 0} // set the homing speeds (mm/min)

// default settings

#define DEFAULT_AXIS_STEPS_PER_UNIT {78.7402,78.7402,200.0*8/3,760*1.1} // default steps per unit for Ultimaker
#define DEFAULT_MAX_FEEDRATE {500, 500, 5, 25} // (mm/sec)
#define DEFAULT_MAX_ACCELERATION {9000,9000,100,10000} // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for Skeinforge 40+, for older versions raise them a lot.

#define DEFAULT_ACCELERATION 3000 // X, Y, Z and E max acceleration in mm/s^2 for printing moves
#define DEFAULT_RETRACT_ACCELERATION 3000 // X, Y, Z and E max acceleration in mm/s^2 for retracts

heres a video I uploaded to youtube
[www.youtube.com]

Edited 1 time(s). Last edit at 11/27/2014 07:40PM by frostin.

my wiring to the coils was not correct. solved. now to fine tweak the movements