You are right, the general consensus is that so if we heatsink it we increase its rating. I just think the net worth of this is not necesarily predictable. Let's say we put the resistor inside a hotend and do a very good job at insulating that hotend, that insulation again changes things the other way because ofc insulation stands in the way of eventual dissipation. So if we heatsink it we increaby NoobMan - Controllers
Ohms law is actually the very definition of resistance (measured in ohms). Generally speaking "laws" may have exceptions or corner cases, but measurement units not so much. The power in watts, with an resistive load, it gets dissipated as heat. This is the effective / real heat dissipation. The markings on the resistors, like "14W", those are "ratings". If effective dissipation and/or temp isby NoobMan - Controllers
Daca vrei sa racesti coldendul, atunci tre sa sufle peste hotend, adica in chestia neagra care e peek/ptfe. Daca vrei sa racesti piesa, plasticul extrudat, atunci tre sa sufle sub hotend, si cat de cat directionat ca sa evite sa sufle in hotend. Teoretic asta ar trebui sa ajute la warping si la piese mici. Atunci cand sunt piese mici au layere mici si le ajuta sa raceasca mai repede ca sa poataby NoobMan - Progres, imbunatatiri. Alte proiecte si idei
Yup that is exactly what i was thinking also. I reached this forum because i was looking into BBB to replace my current router controller. I would of gone with BB-xM instead and i saw some distributors sell an touchscreen lcd, while a bit more expensive it does look quite nice. I looked at machine kit, and sadly it uses debian, which i again i would avoid if i can, so i'd rather go arch arm insby NoobMan - EMC2
The voltage drop on a fully open STP55NF06L mosfet passing 12A should be 0.192 volts. To measure that directly you measure between gnd terminal of D8 and gnd of psu itself. If you do get indeed a 12.4v on main connector and at same time 11.8 on D8, another probable drop (~0.4v difference?) could be on the big yellow ptc polyfuse, and may check that it does not get too hot because those are repoby NoobMan - Controllers
No, i did not meant i wanted to use sli/xfire to run cnc I was just trying to put emphasis on the parts with requirementss like "put 3 parallel cards" or "use an old computer" are just a mark of obsolescence. Emc is so old its a wonder it did not died of old age already. When it was born there were no microcontrollers capable of doing what it did, and it made sense to compute on the pc itself. Nby NoobMan - EMC2
Quotedewy721 You can drive most common stepper drivers boards from a old-school PC's printer port directly. LinuxCNC (aka, EMC2) users have been doing it for literally decades. And that is the problem, usually something that has been done for decades is the very definition of obsolete. Quotedewy721 Also, if needed you can buy LPT printer port expansion cards off of ebay for 10~20$US. General ruby NoobMan - EMC2
The mechanical endstops normally work by using NC, meaning they always sink the 5v from pin to gnd, and the firmware is able to read 0v on its pin. If they get triggered they disconnect the line and the pin jumps to 5v. So ofc that if endstops are missing, that is exactly same thing as them being triggered. So yes connect the endstops and test everything when its completed.by NoobMan - Stepper Motors, Servo Motors, DC Motors
If the firmware upload was ok or not, thats not a matter of guessing, the arduino will verify the upload and give you an "ok" message at the end, if you can read that then its ok. When the motor can move slowly to one direction and not to the other direction, thats a typical situation of a wrong endstop configuration. What happens is the firmware thinks the endstop is triggered, so it will tryby NoobMan - Stepper Motors, Servo Motors, DC Motors
You have put same post in 100 locations And i dont understand what you are saying either. Imo try find your country Reprap User Group and try post there in your native language, perhaps would be easier to understand by others. Imo.by NoobMan - Stepper Motors, Servo Motors, DC Motors
Yes, you are right, there is a degree to the "open" term. The capacitors and resistors we use are not technically open either, but we use those too. But that is not what i meant. What i meant was specifically that without the firmware being open, the success chances are probably null. At least that is my opinion, ofc.by NoobMan - General
Pin measuring is not really an method of getting good conclusion, just sometimes perhaps could point to a problem if its an evident short or something like that. You could try taking the driver which measures the higher resistances of all, hopefully that should be ok, and try some tests with that single driver installed. Also if the driver are susceptible to draw too much, do the upload withouby NoobMan - Controllers
Those pins are logic input pins, so they consume in miliamps range. If the resistance is high, they consume almost nothing, and that is how it should be. The MS pins have pulldowns like 100k. So the range of 100k-50k is ok. For sleep and reset also at least in kohms range. The range like 40-100ohms thats probably not ok. For 5v, that points at a consumption like 50-125mA which is well outside ofby NoobMan - Controllers
QuoteLoboCNC Right now, I'm trying to decide if I want to make the boards available as a product or not. There is also the possibility of just selling the pre-programmed PIC-SERVO S3 controller chip. (Unfortunately, I can't open-source the controller chip firmware because it is based on proprietary code not owned by me.) Hopefully, I'll have my plans sorted out early next year and will make anby NoobMan - General
Ok so if you put 4 pieces of cardboard around the printer you apparently infringe a patent. Apparently putting an obstacle in the path of draft currents is a very new and original idea. I think it should be applied retroactively, so all the descendents of prehistoric man should be made to pay because they were using a rock to cover the cave entrance. After all, that was an enclosure with a heatby NoobMan - General
On manjaro which is an arch related system, i ran repetier and did not had any significant issues at all. I still use pronterface because i like it bit more. All slicers i tried and basically all installations, including arduino work just fine. The AUR repository system is extremely rich, you can search for packages. I think its a setup very easy to work with.by NoobMan - General
When you measure the resistance between 5v and gnd, on a place where is an IC, basically the ic may see a sort of supply and some parts of the ic can get more or less activated. So the results are probably not going to be stable and not very relevant, but at least should be in some reasonable interval. The 5v is logic supply, so generally this consumption is very low in few mA range. A driver cby NoobMan - Controllers
See what pins definitions each have for E0 step and E0 dir, and compare. Those are in file pins.h under the section of motherboard=... which you selected in config.h. I think its possible that in you may have wrong pin definition. Or perhaps you used some development branch of marlin, or somebody elses branch, see if you used the marlin from the official marlin page.by NoobMan - Controllers
The 7805 gets hot when it has to deliver a big current. The linear voltage regulator works by burning as heat the difference in voltage, so the watts dissipated depend on how much current you draw at 5v. If you draw 1A, it has to dissipate (12v-5v)*1a so 7watts. But the 5v consumption on your board should be very small, so normally that regulator should not get hot. If it gets really hot, that poby NoobMan - Controllers
Do not use pwm for heated bed. I would certainly avoid doing that. When mosfet opens and closes, before reaching its end state (fully open), it goes through a state where its partially open and the difference that cant flow through has to be burned out in heat. At high currents of a power mosfet and a bed, that is going to be big. So better avoid having the mosfet through the transition zone as mby NoobMan - Controllers
The pololus are stepper driver on ramps and their outputs are for 2 coils only, so wont work. You would need to remove or not install a pololu driver, use the step/dir/en signals from that header, and route them to a driver of your own, which would be a 3 phase stepper driver suitable for your a 3ph motor.by NoobMan - Stepper Motors, Servo Motors, DC Motors
Uite inca un link despre open source versus closed source.by NoobMan - Progres, imbunatatiri. Alte proiecte si idei
What i meant was to avoid paralleling the gates especially when one mosfet is not used. Cascading power mosfets does not work, not like that, and on several considerations. On signal mosfets probably could use a pullup and would get an inverter. But these are not signal mosfets, these are power mosfets so trying to charge the gate with a pullup is not reasonable from my point of view. Anyway anby NoobMan - Controllers
There is a 5v coming from usb, that can be measured on the usb connector itself (search "usb pinout"). And there is a 5v made by the regulator on board, meaning the board should have 5v also when the usb is not connected. Measure them separately perhaps that helps pointing out an issue. Either way i think the 4.68v look suspicious. The 5v regulators have some error margin, but in few % range, peby NoobMan - Controllers
Uh sry i saw the linux part but didnt noticed the debian part. For mint the arduino page mentions only the dialout group and seems you are in it. Dunno what else. Perhaps try different versions - i have 1.5.6 and runs well for me. If its just a fresh OS install and its same to you, can try install and give this a shot at it.by NoobMan - Next Wave Electronics Working Group
Do you know for a fact that E1 works and E0 doesnt, or is that just a test. If you are sure that E1 works while E0 does not, you can go in pins.h and see which pins does it use for E0 and E1, and just swap them to each other. And with this change, the new E0 will be physically considered the old E1, and ofc, vice-versa.by NoobMan - Controllers
Measuring resistances in that range could be kind of tricky, usually the low values are not read all that well and errors creep in. Depends on your multimeter and what errors/confidence it has. But anyhow that .4 does not sound good. Short the probes together and see the probes resistance if it reads zero. For example if the shorted probes measure 0.2 then have to deduct that from the .4 readingby NoobMan - Controllers
Off-topic, but instead of dual boot try this if you have the hardware for it, it works quite nice for me tbh. For linux check arch wiki, you have to add user to certain groups so it can work with arduino and usb, perhaps that could be the permission issue. So try $ groups and check if you are in groups lock, uucp, tty. Quote I'm relatively new to linux, but it appears the permissions are wrong,by NoobMan - Next Wave Electronics Working Group
Daca nu ma insel varianta cu plastic pe metal era discutata cu dar cu PLA nu abs. Adica pla ar fi avand cica un coef de frecare pe metal ceva mai bun. Dar cine stie poate merge si cu abs. De ce te mai chinui cu openscad, daca nu merge sketchup ia alt program cad sau ceva de genul. Daca te obisnuiesti cu un prg o piesa din aia o faci repede. Mai mult dureaza sa masori cotele la piesele cu care sby NoobMan - Suport instalare si punere in functiune
Yup i think 10 awg should be like overkill, so will do the job and then some Again full solid core wire, not multi-core multi-filar or stranded wire. Although at 10 awg it might work even if its multi-core stranded type.by NoobMan - Controllers