First post, so if I do something stupid, don't send me down in flames.
I bought some used steppers, built my own Gerbl breakout for a Uno, got some 4988 stepper drivers, set up GRBL as close as I can guess without actually having the machine running, and use Universal Gcode sender to jog things. This is the first time I have been able to try the steppers,unipolar 6 wire set up as bipolar, and all three will start off fine then act like they lock up or sit and "sing" and then maybe continue, maybe not. I have them on 1/16 th step, tried dropping to 1/8th, then full steps, actually got worse. I thought they sounded like they had metal filings inside, so took one apart and saw nothing. Maybe a bad coil in these and that's why they were removed? I tried one with just half the coils used, the datasheet shows how to wire it for more speed, that did the same thing. I got the 24 volt power supply from the same individual, but it checks out OK.
I'm really of the impression it is something in my board or software that is wrong, I just used the Ramps schematic for a guide and laid out a single sided board in DipTrace. All motors turn and reverse, just won't make a full revolution even.
Here is my Grbl $$ output:
>>> $$
$0=2519.685 (x, step/mm)
$1=2519.685 (y, step/mm)
$2=2519.685 (z, step/mm)
$3=15 (step pulse, usec)
$4=250.000 (default feed, mm/min)
$5=500.000 (default seek, mm/min)
$6=192 (step port invert mask, int:11000000)
$7=25 (step idle delay, msec)
$8=10.000 (acceleration, mm/sec^2)
$9=0.050 (junction deviation, mm)
$10=0.100 (arc, mm/segment)
$11=25 (n-arc correction, int)
$12=3 (n-decimals, int)
$13=1 (report inches, bool)
$14=1 (auto start, bool)
$15=0 (invert step enable, bool)
$16=0 (hard limits, bool)
$17=0 (homing cycle, bool)
$18=0 (homing dir invert mask, int:00000000)
$19=25.000 (homing feed, mm/min)
$20=250.000 (homing seek, mm/min)
$21=100 (homing debounce, msec)
$22=1.000 (homing pull-off, mm)
ok
And I will attach the datasheets for the 2 kinds of motors.
Sorry this is long, but I wanted to include as much information as i could think of that was relevant.
I can also send a pdf of the board, but it isn't really complicated, and most of all, nothing smoked and the motors turn.
TomJ
(EDIT)
Told you I would do something stupid, why I posted about CNC problems on a Rep-Rap forum is beyond me.
I bought some used steppers, built my own Gerbl breakout for a Uno, got some 4988 stepper drivers, set up GRBL as close as I can guess without actually having the machine running, and use Universal Gcode sender to jog things. This is the first time I have been able to try the steppers,unipolar 6 wire set up as bipolar, and all three will start off fine then act like they lock up or sit and "sing" and then maybe continue, maybe not. I have them on 1/16 th step, tried dropping to 1/8th, then full steps, actually got worse. I thought they sounded like they had metal filings inside, so took one apart and saw nothing. Maybe a bad coil in these and that's why they were removed? I tried one with just half the coils used, the datasheet shows how to wire it for more speed, that did the same thing. I got the 24 volt power supply from the same individual, but it checks out OK.
I'm really of the impression it is something in my board or software that is wrong, I just used the Ramps schematic for a guide and laid out a single sided board in DipTrace. All motors turn and reverse, just won't make a full revolution even.
Here is my Grbl $$ output:
>>> $$
$0=2519.685 (x, step/mm)
$1=2519.685 (y, step/mm)
$2=2519.685 (z, step/mm)
$3=15 (step pulse, usec)
$4=250.000 (default feed, mm/min)
$5=500.000 (default seek, mm/min)
$6=192 (step port invert mask, int:11000000)
$7=25 (step idle delay, msec)
$8=10.000 (acceleration, mm/sec^2)
$9=0.050 (junction deviation, mm)
$10=0.100 (arc, mm/segment)
$11=25 (n-arc correction, int)
$12=3 (n-decimals, int)
$13=1 (report inches, bool)
$14=1 (auto start, bool)
$15=0 (invert step enable, bool)
$16=0 (hard limits, bool)
$17=0 (homing cycle, bool)
$18=0 (homing dir invert mask, int:00000000)
$19=25.000 (homing feed, mm/min)
$20=250.000 (homing seek, mm/min)
$21=100 (homing debounce, msec)
$22=1.000 (homing pull-off, mm)
ok
And I will attach the datasheets for the 2 kinds of motors.
Sorry this is long, but I wanted to include as much information as i could think of that was relevant.
I can also send a pdf of the board, but it isn't really complicated, and most of all, nothing smoked and the motors turn.
TomJ
(EDIT)
Told you I would do something stupid, why I posted about CNC problems on a Rep-Rap forum is beyond me.