I was on your same path, and finally decided to buy a set of extruded parts. I got a Mendel, but I suppose I could have looked for and gotten a Huxley if I was more persistent. I've not fully groked the Arduino vs. Sanguino vs. Arduino MEGA thing yet, but the primary difference, (reprap wise), is program space and (especially) i/o pins. I haven't figured out if you can have 6 endstops, 3 axis,by pica - General
<--kludgineer's tweak for a captive mounting bolt <-- Domonoky's mirrored and tweaked for the BfB hot end. It looks like he did it to mount two of them on the carriage, not because of the issue I brought up.by pica - Mechanics
Looks like I'll need to design and print it to find out. I don't think it will naturally tighten to the point of binding. Toyota engines turn over counterclockwise, thus the threads on the nut of the main accessory pulley has standard threads. The natural turning force of the engine tends to keep the nut tight. (Edit: I forgot, they actually turn over clockwise, but the bolt that holds on to thby pica - Mechanics
I have to confess, I'm not sure I understand the problem. Maybe thats because no one wants to upload their video of a bad print to youtube. So the 3-D printer runs too fast and we loose count of steps, and then all of a sudden we have an unplanned overhang on the part we are printing? Slowing down the print head is undesirable or not practical, or the error occurs at slow speed too? Recalibratinby pica - General
tbfleming Wrote: ------------------------------------------------------- > I use two bolts tightened against each other. It > prevents it from working its way loose, but I can > still quickly undo it for flossing. Yea, with the hardware I've got, I was planning to go the same route (maybe add a lock-washer). But it occurred to me that the entire extruder might be improved by a slight rby pica - Mechanics
rocket_scientist Wrote: ------------------------------------------------------- ... > Simply measuring mouse > movements against a textured surface will not be > very accurate. You need a scale that is accurate > over distance. ... Do you need accuracy greater than say one turn? For example, your bot does a fast-as-possible move where there might be an issue where one or two steps aby pica - General
So I'm sitting here assembling a copy of Wade's fine work and I've got a temporary 8mm bolt through the main gear to mark it for hobbing. After getting it assembled mostly, I noticed that if the largest piece was a mirror image, then when you got the whole thing running, it would tend to tighten the bolt rather than loosening it. I'm guessing that may do away with the need for nyloc or thread loby pica - Mechanics
J-Dubs Wrote: ------------------------------------------------------- > @Pica - I have no influence or stake in VXB, they > were the only supplier that was willing to offer > discounted packages to this group when I inquired. > I did provide feedback to them in regards to this > price. I think that this price was originally set > up when the bearing kit was $10 more so they mby pica - Mechanics
an extra $30 is a little steep unless you are allergic to a hacksaw. Even then you'll somehow need to get the threaded rod and other hardware parts, so it's an order to McMaster-Carr or someone else anyway. Might I recommend # 88625K67 at 3 x $4.88. It's almost half the price. I've gotten mine, and it looks smooth and usable as far as I can see. 3 88625K67 #– $4.88 3 O1 Tool Steel Tight-Tolerby pica - Mechanics
annodomini2 Wrote: ------------------------------------------------------- > It's a USB->RS232 TTL cable, It's specifically > used in this way, RS232 drivers are a pain in the > arse, the aim is to eliminate the full RS232 > interface. When I buy a cheap USB to RS232 Serial Port Adapter, it does not come from China with a label that says, "Sucks less than the other guy's, but we sby pica - Controllers
I'm at $487 and hopefully need only electronics, (and hopefully I have the correct steppers). While I'll have extras, the value of the leftover nuts and bolts will be less than a double sawbuck ($20). While I'm not interested, I am curious how you will make a profit on a full kit. I can't see squeezing more than maybe $60 out of my build cost through buying in bulk. Maybe. You also have to figby pica - General
I have no interest in cloning this for makerbot. I want one for my mendel. JohnA Wrote: ------------------------------------------------------- > Almost nobody runs endstops on MakerBots (they > don't even come as part of the kit any longer) so > at the moment almost nobody has the ability to > locate like this. >by pica - General
First improvement? Maybe move the motor off the platform and on to the chassis. That should remove a significant amount of weight that needs to be moved in the x-y-z direction. Mine's not up and printing yet, but I've heard that the makerbot has a faster build speed due to a smaller mass it needs to kick around. The platform should be in a fixed position always when you roll the conveyor belt, sby pica - General
Take a look at Mantis 9.1: It uses drive screws instead of belts for more torque and slower speeds. It looks easy enough to bootstrap too, although I have not found the electronics package yet. The vids he's produced seem to be kit-centric, (he seens to have sent out kits at some point), but there are dfx file available. Now If I could only learn enough of qcad to extract the measurements myby pica - Reprappers
How much is shipping at New Image plastics?by pica - For Sale
I touched on this in this thread: but there was a very interesting link today at Hack-a-day. This guy put a scope on the cheap rs232<-->USB adapters and found that they're really not compliant. He found they were using +5 volts for high and 0 v. for low, in other words they were using TTL levels. Jan Axelson showed me how this *usually* works back in her series on the 8051 in ComputerCrby pica - Controllers
OK, it's funny that I'm the first to notice that. The picture dates from October 2009. The English wiki was edited. Who's up for taking care of those two Spanish pages?by pica - General
OK, I'm looking at this picture on the wiki, and there's two parts show. Both say "0off" in the name, so I assume I don't need ether one. I'm looking for conformation and perhaps an explanation for the history books. I plan to note this on wiki pages. I assume they are beta parts for Mendel and it was too time consuming to re-render the picture or something. Still, I can't find any documentationby pica - General
I hope git is easier to grok than subversion. I always kept a cheat sheet handy for checking in my code, never did "get" it though. tWoolie: sorry, missed the reference to SVNby pica - General
That sounds like a job for sed. Unfortunately I don't know what to put in place for "\\campus\files\MechEng\Research\General\AB\AB-0001". Nor do I know where the bad files are located. Is it on the wiki? Can you use an earlier version? Sounds like an easy fix but need more information. tWoolie Wrote: ------------------------------------------------------- > Some careless person uploadedby pica - General
freds Wrote: ------------------------------------------------------- > The USB is desirable because it plugs into about > everything where most PC's no longer come with > serial ports. > I get where you are coming from, but serial ports are not an issue for me. I have two, unused on my PC (admittedly, the PC dates from '03). I also have some curb-shopped ones (I'm keeping them for pby pica - Controllers
First off, I put a redirect on the wiki from [] to [], because in the real world that's what everyone is calling it. I also added a section to [] and said: QuoteYou should be able to use [] to drive this extruder. I assume the 2.2 one would work too. I'm wondering how to flesh this section out. Any suggestions?by pica - Controllers
CrawlerLogger Wrote: ------------------------------------------------------- > Is there > plans to incorporate rotary encoders on the > steppers at some point in the development? not to my knowledge. I see on the stepper-motor page what you refer to. Below that is a list of acceptable motors, both dual and single shaft. It must have been an oversight.by pica - Stepper Motors, Servo Motors, DC Motors
it looks like it's just a short blurb. Then, there's a link to the main article: QuoteMain article: RepRap Project Is there anything missing from the main article?by pica - General
Thanks, rhmorrison and VDX, that really helps.by pica - Controllers
VDX Wrote: ------------------------------------------------------- > ... the common communicationg speed is 19200 Baud, > but some runs with higher speeds too. > > As the USB-Driver is a common RS232-to > TTL-wrapper, there is no real difference ... Thanks for the speedy reply. I suppose that answers all my questions, but I'd love to hear if anyone else is having issues with cheby pica - Controllers
Hi, I'm just starting to look at electronics for the Mendel. I've noted that there's several people using the rs-232-to-USB converters and I've also noticed that several of the new designs take commands directly via USB. I have a few questions: 1. Is there a speed-up when you use USB? Or is all this negated by an immediate "down-convert" to serial speeds (even if it's TTL logic instead of "reaby pica - Controllers
That explains a lot. I've given up and started using google instead. SebastienBailard Wrote: ------------------------------------------------------- > By default, the forum software only searches the > last 3 months. (You're not the first to run into > this.)by pica - General
nophead Wrote: ------------------------------------------------------- > Depending on how the parts have been printed, > drilling the holes out may leave the holes without > walls or with very thin walls. Yea, that was what I was worried about. I'm thinking of replacing the "triangles" and all the threaded rod that connects the two "triangles" with my threaded rod, appropriate washers,by pica - General
mccoyn Wrote: ------------------------------------------------------- > The only issue I can think of is the bearings for > the z-axis. Thanks, and good point. I may just use the metric rod for the z-axis.by pica - General