wow, sorry of course you are right, I don't know where my head is today.by fireraisr - Sanguino(lolu)
No, you are correct. When you go from 1/8 stepping to 1/16 stepping without changing any settings it would take twice as long. You are essentially doubling the steps per mm when you do that so using the same settings for both configurations will indeed cause the time difference. This sounds like a software issue. Try changing F6000 to F12000 and you should see the problem disappear if the motorsby fireraisr - Sanguino(lolu)
It's a limitation of the motors you are using. Your drivers can provide incredibly fast signals, so fast that the motors can't keep up. That's why if you used the default reprap firmware and only changed pin assignments and tried to run the z axis it would ramp up so fast that the motors would stall. This had me confused when I first started too.by fireraisr - Sanguino(lolu)
jgilmore: yes extending the board in it's current configuration would make it a beast with the v/r pololu's. However, changing the orientation of the drivers a bit would cut down a ton on that increase. Rotate the drivers by 90, add the additional through holes to accommodate the wider driver and increase the width of the board by half a pololu and you now have instant support for v/r drivers. Wby fireraisr - Sanguino(lolu)
woah, I was going to do this. Looks good, most of the electrical concerns were raised already so I'll just post a feature I'd like to see I'd like to change the footprint for the pololu drivers to accomodate both the voltage regulated and non-regulated versions. The regulated version is a bit wider and about half again as long. (I want this because the standard drivers ALWAYS sell out now) Thisby fireraisr - Sanguino(lolu)
I'd check out the Reprap irc channel. A lot people doing various bits of development hang out there. irc.freenode.com/#reprapby fireraisr - Reprappers
Ok, I figured out why the Fleming Bros didn't upload STL files. I downloaded alibre and the stl export function SUCKS. It screws up the mesh and the file becomes virtually unreadable. So I spent the time to painstakingly comb through the step file in pro/engineer, saving each individual part as a .prt (pro/engineer native format) and then exporting each file to stl. these load into the reprap hosby fireraisr - Reprappers
Well, I was at our local hackerspace where my nice desktop computer is setup since my house is in "Nice Mode" to try and sell. I loaded up Pro/Engineer Wildfire 4.0 on a whim and tried opening the Alibre files. To my obvious delight it imported all the files nicely with the only problem being it made 2 duplicates of every file. This Saturday I'll be cleaning out the extra files and saving everythby fireraisr - Reprappers
Wow, nice blog CW. In case anyone is wondering I am one of those people building with CW and all of my questions are related to that project. If you want to know what I look like you can see my hands soldering together one of the stepper controllers on his blog.by fireraisr - Reprappers
Hi, I was doing some quick calculations since I still need to order my threaded rod. Does Isaac REALLY use 6 meters of m8 rod?!? A quick check of mcmaster carr tells me that will cost almost $50. Please tell me my math was wrong.by fireraisr - Reprappers
I'm pretty new here and looks like my electronics will be working pretty soon. I'm building Isaac and was wondering if there was a repository of the STL's? I know there are the Alibre files but it seems like a pretty common request for an STL so I figured someone out there would probably have them converted and ready to go. It could be just me but it seems pretty silly to release an open sourceby fireraisr - Reprappers
Ah, ok that makes sense. I never would have thought it was a pull down. The important thing is I got my axis moving. Next I need to set the current levels so my motors perform reliably. I had an issue before enabling microstepping where if I would test the z axis it would ramp up so high the motor would stall. Is this normal for a stepper to stall out like that if the signal goes too fast? It maby fireraisr - Reprappers
Solution: Ok I'm using the Polulu 1202 Drivers, the problem was with how I read their schematic. Turns out I was powering the arduino through the regulator on the stepper driver. When I unplugged the usb for the arduino it didn't turn off, that was an obvious red flag. The way I had it connected lead to the arduino not communicating with the pc. Removing all connections from the upper right sidby fireraisr - Reprappers
Update: found the instructions on how to setup the com port. Doing it through the reprap host changes the configuration but now when I set it to my windows com port (COM2) I get: Error opening port COM2 Does anyone know the required settings (baud rate, etc) for reprap? I know I'm missing something here. I've decided that to keep this thread alive with all of my questions and solutions to the prby fireraisr - Reprappers
Ok, new problem, same topic. I'm trying to connect to my arduino mega through the reprap host but I keep getting error opening port: /dev/ttyUSB0 I know my port needs to be set to COMx but I have no idea where to change this setting. Looking in the wiki it tells me that win7 users might have to set the environment manually and then it links to the java site. What it fails to do is TELL ME HOWby fireraisr - Reprappers
lol, I feel like an idiot. I found the pins file. Also, a quick redownload of the reprap package got rid of my compile problems. Successful load of the bootloader and I have action on my step pins. All is well. Sorry for the useless post. Markby fireraisr - Reprappers
Hello All, I just received my arduino mega and am trying to compile and load the firmware. Whenever I try to compile I get an error "bedtemptable was not declared in this scope" I've gone through the configuration.h and set the motherboard to 3. Do I need to change any other settings? I'm just trying to link with the arduino and simulate steppers with led's at this point. Can anyone tell me wherby fireraisr - Reprappers
lol, that's actually the site I stumbled across with the lin engineering steppers. I read someones post where they mentioned a lot of people buying them because they are cheap but couldn't tell if they meant that as a good or bad thing. Here's the link to the motor I was looking at. It's $10, but I'm wondering if they will wear out quickly....by fireraisr - Reprappers
Wow, your story is amazing. I'm building an Isaac as well but am focusing on the electronics first. I haven't tried uploading anything yet, just compiling and am running into a number of errors myself. I too have experienced the frustrations of navigating the wiki. It seems like the mindset is just throw the information out there and hope it sticks. The Isaac page is like a desert wasteland of inby fireraisr - Reprappers
my steppers are the 1400 g-cm polulu's. I went with them because all the other motors I was able to find wanted $60-100 shipping. It wasn't until I had the motors and searched the serial on them that I found out they were nema14's. Will the lin electronics motors from the reprap wiki work? They're listed as tested but for $10 a motor I'm wondering how reliable they are.by fireraisr - Reprappers
I'm going to try, if it doesn't work I'll use them for a huxley. What's the recommended torque for a wades?by fireraisr - Reprappers
Hello all, I'm building an Isaac and just bought my hardware. When everything arrived I found that I had inadvertently bought NEMA 14's. Will wades extruder work with those or will I have to modify the design? Thanksby fireraisr - Reprappers
Traumflug Wrote: ------------------------------------------------------- > fireraisr, I fear you seek too much for possible > trouble. Many people are using these drivers > already and they work for them, so undoubtly > you'll find a way to make use of them, too. Get > started and solve problems no sooner than as they > appear If it were just me I would totally agree with youby fireraisr - General Mendel Topics
A guy in my group just asked how hot we should expect our polulu drivers to get. I've seen people with little RAM heatsinks around, is that adequate, or should we expect to need something bigger?by fireraisr - General Mendel Topics
Hey, thanks for the quick response. Yeah, I thought that was the case. Hopefully I'll be joining the community of reprappers around mid-october. Thanks again, Markby fireraisr - General Mendel Topics
Greetings all, I am part of a group of 6 people at the San Diego hackerspace that will be building Mendel's with the polulu electronics. We are currently in the parts acquisition stage and are having a disagreement on the motors required for these to function properly. It is my understanding that if we use the active current limiting feature of the A4983 boards we can run motors spec'ed for 4.2 vby fireraisr - General Mendel Topics