the 2 yellow parts behind the connector are fuses, see if they are blown. you should be able to slowly seperate the arduino board from the ramps board. after that ... plug the arduino to USB and see if it is still alive. btw the PSU, any fuse blown?by redreprap - RAMPS Electronics
what kind of milling motor did you get?by redreprap - CNC Routers, Mills, and Hybrid RepRapping
hmmm i guess the blokes who made this 8825 chip doesnt play with motors alot LOL ... so it seems it need a very perfectly "aligned" motor spec for it to achieve max specs or something ... i can understand what u r referering to re the audio drive ... so far the best audio drive peeps are from germany. at about 90+ % efficiency, they PWM up the incoming AC into DC, and PWM this DC into audio ...by redreprap - RAMPS Electronics
mmm i think u r right. 3ohm looks more like a 2A+ coil i have a 0.38A stepper, i could run it at 30v. and a new 1A NEMA23 (20kgf), is also rec to run at 30V. somehow i love steppers with high coil resistances KSevcik Wrote: ------------------------------------------------------- > The drivers should be more or less identical, > aside from the extra heatsinking on the SureStepr > driveby redreprap - RAMPS Electronics
ok i understand the problem now ... or partially lol ... hmmmm quite a handful there ... for A4988, when i use it with low current steppers, the whining disappears (opposite when you use high current steppers) so for the drv8825 ... it is going the opposite way it seems. i wonder how could 1 mod a DRV8825 to supercede the A4988 ... or it can never be done?by redreprap - RAMPS Electronics
i just had another thought about testing the limits of your setup. if you can program a test "sketch", make the motors step at roughly 0.5s intervals (say 20 steps clockwise, and then 20 anti clockwise). try to measure the step intervals and see which is the most consistent setup by changing the following 1) stepping from 1/1 to 1/32 2) current adjustments (or Vref?) 3) if you think you can tryby redreprap - RAMPS Electronics
oic ... does this material succumb to acetone "vapor" process as good as the normal ABS? if not ... i must say it is really junk then lolby redreprap - Polymer Working Group
mmm interesting, some questions 1) does the azteeg run the same "sketch" as arduino? 2) whats ur Vmot? 3) can you try running those in 1/1 step mode? 4) what are the Vref or drive current settings? cheersby redreprap - RAMPS Electronics
cncjoe Wrote: ------------------------------------------------------- > Limited knowledge? Your name is ALL OVER this > forum...by redreprap - RAMPS Electronics
hmmmm interesting, is there anything based on carbon? or even tin powder? SMD soldering uses these pastes, i reckon at certain mixture levels, they could be cheaper than the 40e per 25g? then prolly heat cure it, or if there is a good filler/resin to go with it? just a thought though :pby redreprap - Paste Extrusion Working Group
correct me if i am wrong, so i could grab a bag of this (http://www.natureworksllc.com/~/media/Technical_Resources/Technical_Data_Sheets/TechnicalDataSheet_4043D_films_pdf.pdf) ... and make my own filament?by redreprap - Polymer Working Group
im not familiar with diff bet ABS / polylac ... so whats going on with polylac? more toxic? im curious to know too :pby redreprap - Polymer Working Group
well hope you are seeing this ... i fix audio stuff for foilks around my local. take some pics and send me the variable resistor that makes that scratchy sound, i can offer you some repair tips if it what i think is the faultby redreprap - Experimental and Hobby
i got these US$0.50 AC connectors from the local electrical store. maybe it could be a cheap and robust temp connector. they are rated 250VAC 16A, the pins are really solid. i think in some parts, there is also the BG style brass pin type, they are 10A rated i think. the BG style comes in a fully enclosed plug/receptacle.by redreprap - RAMPS Electronics
hmmm i dun quite get the correlation of the voltage to this DRV8825s. i do have 3 of this chips in my little "to do" box (waiting to build up my PCB mill, then a tester DRV8825 ... maybe soon hopefully lol). so what i gather from what you guys are saying is that, DRV8825 have more problems at microstepping? unless you inject higher "Vmot" so to speak? KSevcik Wrote: ----------------------------by redreprap - RAMPS Electronics
well its got to do with the way the ground is connected. this problem has surfaced before. to explain this, lets name the supplies like this : PC USB has a supply : USB +5v (we call this +USB ), USB GND (we call this -USB ) arduino/ramps supply : +V (we call this VSS), negative return -V (we call this GND) due to the 2 seperately floating supplies, which have 2 different isolated return voltaby redreprap - RAMPS Electronics
i find this entire 3d printing to be very enticing. coupled with my limited knowledge, i decided to go the long way of trying to ascertain the exact science and try to DIY the entire thing. so lets see if my patience will win, or my curiosity will force me to buy a kit (its kinda 50/50 now LOL !!!)by redreprap - RAMPS Electronics
wow your rig is solid metal ... i bet they are heavy ? cncjoe Wrote: ------------------------------------------------------- > Yup. My caps are 35 volt, I replaced the fuses > with inline ones at the + of the power supplies > and I did the FET hack successfully like you said > on another thread Cefair. Thanks for your help! > I'm kinda disappointed with the performance of the >by redreprap - RAMPS Electronics
HA ! ... i love the speak / talk about power ripples ... i did some experiments (see here --> [3roomlabs.blogspot.sg]) ... remedy --> add more condensers. there were some comments that the power rail noise does not affect the Rsense ability to feedback correctly. some say the A49xx have ability to float Vsense over the noise, i am really not so sure that A49xx are really that robust agaby redreprap - RAMPS Electronics
PCB mill is a in thing it seems ... i am making mine from WOOD ... ... [3roomlabs.blogspot.sg]by redreprap - CNC Routers, Mills, and Hybrid RepRapping
im slow learner ... and builder ... too .... lol, perhaps looking at others build blogs would helpby redreprap - Developers
i have been reading autodesk's partnering with makerbot with interest, they are going to mess up open source really well ...by redreprap - Developers
a techie! YAY ! i am a repair tech of sorts too :p i used to repair things like these tell us a secret, what is the strangest thing you found jammed in the 3D printer you have opened up beforeby redreprap - General
Y gantry done [3roomlabs.blogspot.sg] it does look very odd LOL !!!by redreprap - CNC Routers, Mills, and Hybrid RepRapping
interesting, would you be able to elaborate what you found so favorable abt the repetier?by redreprap - CNC Routers, Mills, and Hybrid RepRapping
squaring up and testing Z + X axes [3roomlabs.blogspot.sg]by redreprap - CNC Routers, Mills, and Hybrid RepRapping
its ESUNpla, its made in china . there was a post somewhere in some other forum, and then they retracted the price and stated the price was for BULK order. i would like to know if this time are they playing the same game again? nothing against u guys from esunpla, but i hope you are serious, and not fishing around.by redreprap - CNC Routers, Mills, and Hybrid RepRapping
Z-axis done [3roomlabs.blogspot.sg]by redreprap - CNC Routers, Mills, and Hybrid RepRapping
its all on the blog [3roomlabs.blogspot.sg] well as expected, the CHINA rails are quite sticky, and the belting gives quite a bit of buffer. but no surprises, 6.7 microns per step is quite achievable. *edit* i have no understanding of stickiness of moving rails prior to this, and now with the help of a dial indicator, sticking is such a PITA. if there is a index of sticking error, i think tby redreprap - CNC Routers, Mills, and Hybrid RepRapping