o crap ... now Z is affected when it was not before?by redreprap - RAMPS Electronics
im beginning to understand how these things work ... but i got lost when i hear you guys say M104, M42 ... what are these?by redreprap - RAMPS Electronics
anyway i have no idea wads accelstepper ... its a another type of "soft" drive for steppers? i read its steps per second ... i dun quite understand how it is diff from the above way of drive ...by redreprap - RAMPS Electronics
i am starting to dig into these, the below code is what is being used to test all parts of a ramp 1.4 setup. it is slightly diff from a std code being circulated around the web, jus to suit my own testing. iirc max/min pins are physical limit switch logics operationally, i think it is possible to use "enable" pins like a emergency stop switch. dir n step are pretty str8 forward, direction of stby redreprap - RAMPS Electronics
for those who want to see the individual steps of your stepper moving ... to troubleshoot miss steps etc ... use this #define X_STEP_PIN 54 #define X_DIR_PIN 55 #define X_ENABLE_PIN 38 #define X_MIN_PIN 3 #define X_MAX_PIN 2 #define Y_STEP_PIN 60 #define Y_DIR_PIN 61 #define Y_ENABLE_PIN 56 #define Y_MIN_PIN 14 #define Yby redreprap - RAMPS Electronics
X motor swap works ... hmmm so now try swap the driver stepstick ... burnt A4988 ... thats my guessby redreprap - RAMPS Electronics
hmmm ... ima need to go try out the free lesson from EDx on electronics lolby redreprap - RAMPS Electronics
hmmm interesting, 2v ... but still the driver does dump the full 12v into them dont they? only thing is the driver will clamp the current to 1.2A. somehow the power has to go somewhere, either the motor fully sinks this power, or the driver takes up the excess (which i doubt is the case, unless its some kind of linear driver). i dont have a proper scope here to measure the voltage drop of driverby redreprap - RAMPS Electronics
i assume u are driving them with stepsticks? ... well i think i am trying to figure out how accurate/consistent 1/16 steps can be, after reading up lotsa stuff about them esp from nophead ... check out the 2nd half of this thread maybe you can try your own test and post some vids. i am curious to know, how diff stepsticks match with diff steppers ...by redreprap - Stepper Motors, Servo Motors, DC Motors
yes it is strange isnt it, i think the only diff i have here between the A4988 /4983 ... is really not much ... but the way A4988 pushes the stepper, it is quite a long way off even at 1/8 step. i have tried R4 shorting on this chap, my guess is ... 4988 doesnt like high resistance / high voltage steppers? or isit a case of badly designed PCB, tons of spurious capacitance, etc? or theres somethinby redreprap - RAMPS Electronics
in order for the stepper drivers to correctly drive the motors (assuming its not plug n play and pre-calibrated etc) ... u need to set the limit of drive current, assuming also like some of us just pick any old stepper to dump into it. the variable resistor that sits on a driver stepstick, is about 3mm HUGE ... all i did is sneeze (or turn your head when mom calls you) ... my multi meter probe goby redreprap - General
i cant imagine turning a solid PLA plastic page ... dual extruded ... white background .. black text ... and grayscale for whatever pics ... oh gawd no! VDX Wrote: ------------------------------------------------------- > ... no, it's essentially a non-3D-printed mag > about 3D-printing > > Imagine the weight of a magazine, printed with a > RepRapby redreprap - RepRap magazine
9 hours a day ... MAN !!!! you not trying to overtake LEGO in making bricks r u? lol jus joking NelsonRap Wrote: ------------------------------------------------------- > I had some wheel bearing grease left over from > fixing my car and used that, my Mendel was running > 9 hours a day for about a year and even now there > are no signs of any problemsby redreprap - General
hmmm if u are fat thumbs like me, take care not to fry the single board electronics ... esp stepper drivers if you think you might, go for the boards with modular stepper drivers. i fired 4 drivers already LOL ... but im fat thumbs !by redreprap - General
i think a mag will be nice, but how about a e-handbook? as what was mentioned, the wiki does contain loads of info, however, it does not have a "linear" organisation to it for new readers, it is really very much like a tree branch. i think, if it becomes a web handbook done in a way like ARRL ham radio handbook, it will definately boost the speed at which noobs can pick up the hobby. why do i saby redreprap - RepRap magazine
i use the below code on the arduino "compiler" v1.01 if ur steppers are not fixed to a machine, face them spindle up free-wheeling and watch them spin. (example ) to change the speed of the stepper, change the 2 delay values from (0.1) to (1) or more to slow down the spin. #define X_STEP_PIN 54 #define X_DIR_PIN 55 #define X_ENABLE_PIN 38 #define X_MIN_PIN 3by redreprap - RAMPS Electronics
hmmm walls are flat, if mirrors rotate on the shaft, they need to strike a round target so that results would be linear for comparison i think. that will be tricky getting 1/16 right seems really a handful if driver and stepper is not a "resonant" pair. did you managed to get a driver/stepper combi to work well @ 1/16 step? i think for my case, i can rule out that A4988 will drive the sanyo stby redreprap - RAMPS Electronics
good idea, jus checked. its all tight. the audio sounds loud cos every clip is edited +40dB Cefiar Wrote: ------------------------------------------------------- > May sound silly, but have you confirmed that all > the screws in the motor are tight? > > I found a loose grub screw on my extruder motor > gear (it has 3) and it was rattling like crazy.by redreprap - RAMPS Electronics
just to confirm, the SMD circled in blue is the R4 on a A4983? before i gut the wrong SMD to test mod lolby redreprap - RAMPS Electronics
come to think of it... im quite happy i burnt those "white" stepsticks ... otherwise, i think i would not have dived into details of stepper driving. and tnx for all your help nophead :pby redreprap - RAMPS Electronics
this is how it looks like from the rear stepper taped to a set square, and a wire taped to the pulley pointing to some angles on the set squareby redreprap - RAMPS Electronics
this is a A4988 on 1/8 step ... approx 600ms++ per step (on 1/16 i noticed some steps turning more then usual, is this miss stepping?) even on 1/8 step, 2 of the 8 steps make bigger "leaps" then the usual. i assume this is what we term "miss-steps" ? so in this case the shorting of R4 can be used to attempt to correct this?by redreprap - RAMPS Electronics
this is a A4983 on 1/16 step ... approx 600ms++ per step i tried varying the VR to see what are the effects of current control on the "linearity" of the steps. seems like nearly max rated current is a good bet. there are some audible hiss. i assume that this is approximately a good paced 1/16 stepped? if ignoring the hiss? i do note that the 5 steps per set square mark are not entirely perfectlby redreprap - RAMPS Electronics
that is a cool crown ! however for me, i am building a big machine str8 from scratch. mostly of wood because its something new for me, i am only at the stage of exploring all the parts. already i have burnt 4 stepsticks, 1 MOSFET ... :p and i think it will take me a few months to finish :p... prolly will finish 2nd quarter next yearby redreprap - Reprappers
im a worse noob than you, my machine is not even done. my guess is like conversion of G-code ... is overly simplified? have u checked the G-code generation options?by redreprap - Reprappers
attached files for ref 2786 = A4983 2787 = A4988 both clips audio highly amplified. stepper supply 10VDC steppers sanyo denki. per coil 10.6ohm, 0.85A/9VDC rated (VR adjusted for a drive approx 0.7A) arduino setting, test pulse dump cycles at 768microseconds all driver boards not modded for zero ohm. *hi nophead --> would appreciate ur feedback, is the 2nd clip showing bad u-stepping? isby redreprap - RAMPS Electronics
well not sure where else to post this ... after destroying a few A4988 drivers (white color ones from reprapdiscount) i managed to order a few more cheap A4983 variant from ebay. incidently, these boards came with a larger sense resistor value than those from reprapdiscount (theirs is rated 000, the new ones are marked R200). for some reason, these A4983s ... are so quiet ... is there anythby redreprap - RAMPS Electronics
hmmm this would work on a fixed heater bed design wun it? ... interesting ... a mass detection system tied to the extruder ...by redreprap - Developers
ooo i love rostocks ! yea i think rostocks use a special marlin or somethingby redreprap - Reprappers