Chances are if you run it lower than 1.25A you will loose the majority of your torque rating curve, especially at speed. Unfortunately I wouldn't trust those chips running over 1.5A. I.e., a motor designed to run at 1A and run at 1.2A will run way better (but hotter) than a motor design for 2A and run at 1.2A...in my opinion. I can't back that up with equations but it has been my experienceby Simba - General
Same here... Don't forget some caveats. That thing is SUPER TINY. Also, metal deposited on a previous oxide layer is completely inferior (it would flake off with vibration or shock instantly). Proper metal prints for the consumer are gonna take quite a bit of work...but we can draw inspiration from the micro/nano mechanical systems academic progress.by Simba - General
Hey does anyone know what the Swagelok tube-connector looking things are in this picture that are black and connect to the bowden tube? it seems to say BSPP on it. also How do you print a floating tie fighter with no signs of support material?by Simba - General
You can also use each stepstick output as a reversible controllable output i.e. One stepstick = 2 coils controlled in two directions. This is two reguarly DC motor controllers, or two solenoid controllers. Based on the stepstick chosen, it may be possible to control two 1A solenoids continuously, its not really ideal for much more current though, until we finish our Fiveamp chips someday sooby Simba - Developers
Yes, certainly, because the manufacturers really don't want to make less than 100-200 units, we have to sell quite a large portion before we can begin to break even, that is, if we are to give reprappers a fair price. The biggest missing piece is a clear "aha moment" or application that makes obvious use of the decapede, the most obvious I think is a 10 legged robot or a multi color all-in-oneby Simba - Developers
Latest updates Okay, so the basic decapede has been completely reworked to give us a far more robust system. Changes include -Centering the device over arduino so it is balanced, and the USB housing is no longer nearly touching the solder. -Reduced the number of digital pins arduino uses from 2 to 1, and allow easier switch connections now (2 pairs of 2 header pins) -Much wider tracers to handby Simba - Developers
Just throwing down a note here of the recent addition of "physibles" to the torrenting world. They appear to contain mostly banned parts at this time.by Simba - General
Hi. I agree. did you know we put 8 thermistor inputs and 8 heater outputs on this board?by Simba - Developers
rsilvers Wrote: ------------------------------------------------------- > Sounds like your dealer is the problem since they > refused to replace it. I'm sure you had a really bad experience and this sucks. I just wanted to throw in mine, it has been really good, dealing with Affinia tech support directly, and we bought 4 of these printers already without any problems. The bears do seem tby Simba - General
Current updates: We have made a great deal of progress on our fiveamp board, which will infact allow passive cooling at 5A, passive endstop replacement (stall detection, and many more cool features. In addition, we have replaced decapede + reprap expansion with Decapede RE (reprap expansions). This is a one board solution. Even though it is not modular, it saves a lot of space, is more structby Simba - Developers
Hi Guys, Just an update. The resistors our designers chose were not right for the first batch because of the stepsticks internal impedance being so high, so we had to roll out an update. The bigger update thought are plans and a successful design for new motor controller, called "Fiveamp." Fiveamp is an overpowered brute-force motor controller with 10 amp fets and onboard MCU designed to addrby Simba - Developers
Buy the Affinia please, save yourself the trouble of considering makerbot. Its the best print out there.by Simba - General
From what i can tell, PLA practically only exists as a material for disposable silverware and as a 3D printer material, and also BB pellets. These are super niche uses with the somewhat weak justification that they biodegrade ("faster" than other plastics = 100s of years underground still). AS far as plastics go, its pretty weak, and low temp, compared to most plastics, except PVC, PS, and LDPEby Simba - Powder Printing and Selective Laser Sintering
johnrpm Wrote: ------------------------------------------------------- > A concept I have had in mind for some time, > > imagine a post, the charged powder is attracted to > it, energy, lasers, electron beam or whatever > aranged similar to a tomography > layout fuses the powder, with multple lasers > acting in unison on multiple areas of the part. > > faster... I doby Simba - Powder Printing and Selective Laser Sintering
Based off my research on metal. All sintering powders are simply a water soluble organic polymer (i.e. Carboxy Methyl Cellulose) that is 99% vulcanized at high temp. They are sticky gels when they dry down. PVA is another. These polymers have the unique property that when they are dried down, they are ridiculously tough, and difficult to rehydrate. The patents are expired now, btw. Gene Haby Simba - Powder Printing and Selective Laser Sintering
johnrpm Wrote: ------------------------------------------------------- > Elecrostatic... laser printer...laser...very fine > layers....Elecrostatic. > > all the elements of a true 3d printer, not just > layer by layer, but building in 3D. Just so i can understand this point better, what is meant here? How is this more in 3D or more true to 3D, than layer by layer? Is it fasterby Simba - Powder Printing and Selective Laser Sintering
Hi Tarakan, In fact, we are in Bethesda, Maryland. We meet reprappers here all the time, at the DC robotics groups, the fablabs, the 3d printer conference, etc. Yes the development of these systems is "Decentralized" though one usually make a development on Reprap their "baby" and they champion it to see if there is interest. After that they would oversee new developments and pull then intoby Simba - Developers
>>What level would mechanical specifications be set at? The computer or on Arduino level? Could you please elaborate on what is meant by mechanical specification? What would you be trying to set? current output ? >>I see a point in writing software that would be able to update firmware and load Gcode too. Would there be G code? The firmwares are easily updated by USB using arduiby Simba - Developers
For all Potential decapede users: I have one question Would you want the bipolar motor phase windings output to be in the AABB format or ABBA format?by Simba - Developers
Hi Vladimir, I am happy to say the answers are yes, yes, yes, and it can be done. The Ramps10 - now called "Decapede" is designed specification for CNC+3DP control in mind so it would be an option (maybe even the only choice?). If you get the Decapede + Reprap expansion it will work like a large Ramps1.4 device. It will have the ability to control up to 10 steppers (1.5-2.5Amp continuous perby Simba - Developers
Just some notes as I test the Decapede prototypes to see what is possible... Pins used: 30 for motors (10 motors) 20 for endstops (10 endstops, min and max) 7 for thermistor (7 analog input on reprap expansion) 8 for fets (8 fet on reprap expansion) 4 free on (GPIO pins on reprap expansion for possible SDcard/other) At this stage, all 69 available pins are fully used. However, the Mega only useby Simba - Developers
Indeed, we would love to have someone nurture this board for a first pass attempt as it is ready for just that. It should be ready to go, all it needs are some new pin assignments in firmware, and a reasonable understanding of PCB current limitations. See my PM, we only have the one board, that cost $500 to prototype so you'll be lucky to have itby Simba - Developers
FYI Here is an UPDATE on our progress!by Simba - Developers
Feel free to send me a PM on this. They are all doable, and good ideas, though there is probably some benefit to using more advanced/cheaper materials based on mass production cost. As for stepper slew rate, that is the term you need to search. Practically, I've run a stepper at 2KHZ (RAW) steps. So if the motor was driven with microstepping, with poor engineering assumptions, we could assumeby Simba - Developers
Martin_G3D Wrote: ------------------------------------------------------- > Simba Wrote: > -------------------------------------------------- > ----- > > At present, I'm not entirely confident about > the > > G3D stepstick anymore. I burnt one that came > from > > G3D, and one that we made from scratch so far, > > just by running the default settings with aby Simba - Developers
Hey, Has Pololu released any gerbers or BOM for their boards? Also why does one site say Kliment designed it?by Simba - For Sale
Thanks!. And for others reading, yes we are still hiring, even more positions, and there may be one or two housing-included options.by Simba - Hello. I need a something designed. For money.
ThrustMe Wrote: ------------------------------------------------------- > Simba Wrote: > > > It is important that linking two chips works. > I > > can't see why it wouldn't - sharing the load, > > It won't work, and it is obvious why if you > look at the data sheet for any of those chips. You > will inevitably end up with one driver trying to > pull an ouby Simba - Developers
At present, I'm not entirely confident about the G3D stepstick anymore. I burnt one that came from G3D, and one that we made from scratch so far, just by running the default settings with a 1.66 amp motor. If things persist like this, I would switch to using a more expensive driver... looking into a 3.5A one in fact. Then I would propose this time, claiming only 2.5A current driving (leaving aby Simba - Developers
My review: Armanicreations Blog Conference site: 3D/DC II: 3D Printing Comes to Washington, DCby Simba - General