Does anyone know where to get SMD v1.2 PCBs? Makerbot is out of stock on them, and they probably won't be restocking them. The only other place that has them is Reprapsource but it's in Europe. I'm using them because my motors pull about 2.5A and the chips are easily heatsinked. I doubt that v2.3 will work with this current.by albanetc - Controllers
> I already have a vinyl-cutter, if I could get > something to batch process the layers from a 3d > object I could at least manually place the cut > layers (using a jig or something) and build up > objects. I've not been able to find working links with pictures explaining the concept, but JP System 5 is (was?) a method for manual prototyping of objects from adhesive sheets cut onby albanetc - Mechanics
> My question, is the drive speed maximized in belt > driven systems? in other words, what percentage > of speed is used on a standard 1.8 degree stepper > motor? Is it railed? 10%? I also have a pile I think it depends. Many steppers come with torque curve which shows how much torque you can expect at a given RPM. So in theory, your RPM will be limited by the torque required kby albanetc - General
> If you can get ponoko to ship you something in > less than 30-40 days godspeed to you, also their > tolerances seem to be pretty wild sometimes. I didn't know there was such high demand > The quote was 1010, I show it as about 50ft so > consistent with you. The economy t-nuts are pretty > cheap at $0.14 in 1 count? There is also nothing That's $14 for a 100 vs $1.4 for 100by albanetc - General
goinreverse Wrote: ------------------------------------------------------- > So rack $8.30 per foot, nylon gear $3 = $11.30 > vs. belt $12, pulley $6 X2, tensioner $4, > bearings/mounts $4 = $26 I didn't count that as extra cost since by that time Contraptor already used pulleys and belts to couple the lead screws. > If you traversal lengths are much longer, say over > 3 feet tby albanetc - General
goinreverse Wrote: ------------------------------------------------------- > Most of the CNC threads I have followed on > cnczone.com (I think?) seem to end up with ball > screw arrangements. I have not delved very deeply > but they superficially anyway seem to have the > best characteristics for heavier loads. Ball > screws offer the accuracy of threaded drive with > the speby albanetc - General
I've been able to run the screw drive as fast as 25 IPM on Contraptor assemblies. However, the reliable speed is about 15 IPM which is pretty slow. This is with 1/4-20TPI all-thread screws and 60 oz*in motors driven by Reprap SMD v1.2. It's difficult to push the motors past 400 RPM, and at 1/20" per revolution this is about as fast as it gets. The belts on the other hand go a lot faster with theby albanetc - General
maitri982 Wrote: ------------------------------------------------------- > I see it only has 2" in the z-axis though...which > is rather limiting for FDM. Maybe they will offer > different scaled versions in the future. This particular arrangement has only 2" Z travel, but 3" is easily achievable by moving the X stage 1" down. This wouldn't require any new parts. More than 3" in Z isby albanetc - General
SebastienBailard Wrote: ------------------------------------------------------- > I don't mind at all publishing Reprap-related > Contraptor projects on Reprap wiki - the more > I'll look forward to it. Should I just create a Contraptor page on the wiki then? > Agreed. I'm probably going to source unperforated > square beam (solid and hollow) locally, and drill > only whereby albanetc - RepLab Working Group
I see your point on using perforated angle iron, and we'll need to do up a variant using it. Contraptor or mntc.ru have done this, recently and ages ago, respectively. I have no idea if they'd like to write up their work up on RepRap.org or not. I'd guess not, as they're selling kits, and have put lots of work into development. In the happy scenario that they're interested, we can just want to foby albanetc - RepLab Working Group