Although probably the ppls pre-conceptions or prejudices on the matter might be true in majority of situations, there have to be some cases where the things are the other way around - proportional to the diversity of what comes from manufacture maybe. Further on, almost all of the advanced plastics can be re-melted, re-used, even scraps might get used again, so will have same generic properties bby NoobMan - General
Some time ago i spent some time looking around for info on advanced plastics and afaik all advanced plastics in commercial sorts have aditives which radically, totally change their properties to the roof. I found that is incredibly hard to pull information from this field as almost every recepy and composition is patent protected and more or less commercial secret, but also because almost all selby NoobMan - General
I find smd components being easier to solder with my iron and clips than trough-hole components. I think most ppls find smd easier too. Besides, smd generally are better at noise and etc. Also i think you plan to use 5V from the atx, which is smps and i think it probably has more noise in it than the usual 7805 voltage regulator. Single sided is not optimal. At toner transfer or photo, double siby NoobMan - Controllers
To switch the mains, i think a triac would be needed, and to control the triac mainly a dedicated optocoupler is needed, which in turn can be with zero crossing or with random point. Solid state relays are something like these two packed together, but usually in my case, its much more expensive than the separated parts (e.g. i used bta140+moc30xx series for another app and i could buy 10 combosby NoobMan - General
As my name suggests that i am probably the biggest noob around, i felt compelled to reply. 1. The fire cement is a cement that stands high temps. 2. Vitreous enamel wire wound resistor (and reading all other posts on Mr nophead blog would be highly recommended). 3. Best way would be to use an extra separate stepper driver board to run the extruder stepper (instead of using the EC2.2 h-bridby NoobMan - General
I simply bought mine from ebay, didnt knew of any alternatives at the time. Btw, nice didnt expected to actually see 2 other reprapers from our country here .... maybe could be nice to request a national forum and to move the topic there?by NoobMan - General
Hello from north side of our country. My first tip would be to get a good set of printed parts e.g. from Mr. Nophead he sells some via e-bay. No advertisment was intended just an opinion. Dont know what exaclty you plan to do, or if or how i could help, but I sent you a pm with my phone no. Cheers.by NoobMan - General
I think there is something here that ppls dont want to see or say. Or, maybe i am alone to see, or its a manifestation of my schizofrenia. But if one thinks there is something wrong, and doesnt point at it, then one can never evolve. In Gen 3, all temperature sensing and all math is done by extruder board alone. That is the point of having it. In the gen3 firmware for the master there should bby NoobMan - Firmware - mainstream and related support
Last line says: "Dibond is rated up to 80oC, so it may be OK for ABS (which should need about 70oC), but I haven't tried it. To get the bed that hot you'll probably need more power than the 100W that I was putting through it. I'd try 200 W. " Probably with 6R8 in parallel making 1R36 @12Vdc drawing 8.82A -> 105.9W. Assuming that trafo and resistors can handle and everything is ok, imo itsby NoobMan - Controllers
Any suggestion for a (cheap and simple if possible), switching mode solution in the required range pls?by NoobMan - Controllers
The ups units i think have secondaries of 15.5 and 18.5Vac. Transformer rated at like 30-35Amps. Not sure i recall correctly. I should check tomorrow. But that would work? Also, since it would supply reprap with voltage regulators, does those really need alot of smoothing close to Vpeak or can work with less - e.g. it wort raise the voltage too much, sort of speaking, could the voltage regulatorby NoobMan - Controllers
Hmmm, with a 24V transformer, like the ones from ups units, one secondary can go directly to heated bed, the other can go to a bridge+smoothing+2 adjustable regulators 5A each, one for extruder and one for stepper boards. So atx 12v can be dissed completelly. Would have the advantage to run motors on higher voltages with less amps and less heating, and adjust the power going to extruder heater.by NoobMan - Controllers
I suppose the obvious - that transformer in question doesnt have a center tap. One bad but cheap way to do it is to put an adjustable voltage regulator, some are up to 5A, like the very old one LM338, although for 12V it would run probably very hot. If higher amps are needed its output can drive some chained power transistors in cascade or paralel. Even fixed regulators are somewhat adjustable iby NoobMan - Controllers
Yup true. The board looks nice and all, and i am not trying to convince you of anything, just answering like an opinion request. Good luck testing (i really hope it will do the trick) and let us know how it goes.by NoobMan - Controllers
Imho: High side switch means it switches the positive rail, which is sensible different expression of "high current switch". Because 5A rating in not really high and is something most fets will do, without sink, in "still air". Also to note this is probably the math about the max point and max operating temp before shutdown, so the datasheet at page 2 gives recommended operating conditions forby NoobMan - Controllers
i have seen this quite a few times in quite a few places. why does config.h for Gen 3 motherboard have temperature sensors and settings ... at all? there is no temperature sensor or reading that master motherboard has to do in gen 3, so i cant see why those are there. it only reads them from the slave extruder and thats all?by NoobMan - RAMPS Electronics
I took a look at the code and i cant see bed temp being inside any manage(). I think it just reads the bed but does nothing with it, like the older firmware release, if i am not mistaking. Maybe i am missing something. For EC2.2 firmware at least, the ramps part seems a little more developed but i didnt looked there. Can i ask if, when bed temp is 0, and you set it to any higher temp, the corresby NoobMan - Firmware - mainstream and related support
Oh ok, sry i was under the impression you had some trouble with it still. Cheers then and Good Luck !by NoobMan - Firmware - mainstream and related support
yes i am running the G3 electronics with EC2.2v. but the issue i think its related to 168 uC and its internal adc, so i dont think it matters what "generation" is being used. also i think the firmware i linked should work both on ec2.2 and to techzone equivalent, but i cant test it; probably would need re-progam the equivalent motherboard too, or else the master and slave might not be able toby NoobMan - Firmware - mainstream and related support
btw also another issue that i runned into with dual analogRead, was this: in single mode (only one pin used), either of the sensors would work correct, but when trying to run both of them, quite alot of jitter appeared and at least one of the readings is not stable, approx +/-~60mV equivalent of internal noise. Maybe its because some internal adc noise issue with switching back and forth the compby NoobMan - Firmware - mainstream and related support
I dont have one, but if you look at the schematic and board layout you will notice it has a RL232 ic on it, so i would say it is probably also the place where you stick your pcb usb into ...by NoobMan - Controllers
I have no clue about OneWire, but once there is a code that reads it and it works, it should be easy enough to implement. I took a swift look at what you posted and indeed, omg, that is quite some code there to read it. Cant say anything except maybe give an ideea, in the extruder class and there are huge lines to delay the read (i guess that is what are for). The link i posted had a similar cby NoobMan - Firmware - mainstream and related support
brnrd Wrote: ------------------------------------------------------- > @noobman - I don't think this one supports that > chip. But I think Wade is planning to edit the > latest firmware to add support for that one. Wade mentioned its max6675 chip not the Onewire. What i linked has the code for Max6675 in it, but its not tested, though its just copied so i dont see why it shouldnt workby NoobMan - Firmware - mainstream and related support
Indeed taking the thermocouple readings from inside makes much more sense, and getting the new beta and compiling a new table is definatelly faster and the best way to go. On the other side, making incremental changes to the old table process is so unbelievable tedious and took like half of a day. Its due to the fact each adjustment needs slight changes split in two, basically each time one hasby NoobMan - Firmware - mainstream and related support
To be more clear, the page that was made with honesty here says in intro: They are designed to cover the full temperature range of -60 °C to 300 °C. and back down a note says: Interchangeable, R-T Curve Matched: These Glass Encapsulated Chip Thermistor units are specifically designed to offer interchangeability over the standard temperature range of 0 °C to 100 °C. I think i have seen thatby NoobMan - Firmware - mainstream and related support
Thermistors are "up to 310C" but also manufacturers will usually have a note somewhere that thermistors are "replaceable only in 0-150C" range. So, beyond 150C, 2 pcs of the same thermistor will read enough discrepancies to "individualize", thus need calibration each. Which means that the Beta value after 150C is cake - and wave it goodbye. Tables are made from it, so after 150C are a thing likeby NoobMan - Firmware - mainstream and related support
@Wade Can u pls let me know if this works with max6675 I am just curious of my copy-paste & del abilities Tyvm.by NoobMan - Firmware - mainstream and related support
I am currently thinking about a rugged transformer + diode bridge + caps or maybe filtering even, for a heated bed. To the point: the transformer from a trashed UPS unit (fairly rugged, some outputs choices), a 35A diode bridge, and just some caps (around 50000uF alu electrolitics napkin determined / hopefully enough - trying to overkill because i am not sure how to calculate the best capacitanby NoobMan - General
As far as i know, for any given parcel, if the declared value / invoice is less than like 20usd or euro or so, the package bypasses customs entirely. Above this minimal amount customs procedures and vat applies, although this minimal amount could differ from country to country - i dont really have a clue if its the same or not in all countries. I have received quite abit of non-ROHS stuff and cby NoobMan - Controllers
Check this out Alot of ppls way smarter than me, which i respect, posted there so i just do like i usually do: save my brain the usual painful thinking process and take what is said there for granted. I have a bunch of 12 pololu boards but havent yet tried any, i plan to use them with G7 with a huxley and nema16 or 11 motors. Would get a better impression then than i do have now. Atm i am muchby NoobMan - Controllers