if you are putting on a demo for "policymakers", what exactly is the agenda you plan to push for?by pica - Baltimore/Wash. DC (and environs) RUG
A quote from the SAE wikipage: QuoteAn attempt to build a Mendel from 100% SAE components. In Canada (and USA I hear) SAE parts are not only MUCH easier to find, but are much less expensive as well... This should help reduce the price, and make sourcing parts a lot less painful for those of us on this side of the pond. I've found the above statement completely untrue, unless of course you are tby pica - General
Here's a blog post about what I ordered from McMaster-Carr It references back to a different thread about McMaster, (as a parts source), that you probably haven't seen yet. I've squared the frame, and all the nuts, bolts, and rods worked out OK, but I've yet to assemble my extruder or mount the control electronics. The O1 Tool Steel Tight-Tolerance Rod worked out great. I've since found 10by pica - General
It sounds like you have a bad part, a solder bridge, a damaged board, or a wiring error. Suggestions: Triple check everything. Consider jumping the LED/resister with the 5v line and make sure the LED lights Check for voltage on the correct pin, and for IR output on the opto-switch Post photos maybe? Perhaps we can see an error? Where in the world are you located? Maybe someone local can help?by pica - Controllers
Answering my own question, this appears to be a "small batch friendly" supplier of ABS granules that is located in the US: $32.00 for 10#, which is a bit more than half what filament is costing me. I have not ordered from this vendor yet. I've also found small batches on ebay at a price that would exceed the cost for 3mm filament, so that makes no sense at all. I was hoping to pick up aby pica - Plastic Extruder Working Group
Parts are widely available on ebay for around $225 (includes shipping). See this thread: (I just checked and there's nothing at the moment, but they 3-6 of them go up for bidding every week.) Also, you could try the marketplace: Or you could see if there's a local hackerspace near you.by pica - Reprappers
large pulley diameter 1.26" thickness .27" small pulley diameter .47" thickness 1.16"by pica - Reprappers
RTV rubber hardens from the outside-in from the moisture in the air. Mixing in cornstarch accelerates the hardening because the cornstarch contains the needed moisture, and it doesn't have to migrate in from the skin of the blob of oogoo. While there are some fumes when curing, afterwards it's pretty inert. You can find silicon caulking and cornstarch in most kitchens. You can usually get a MSDby pica - General
6 volts is good. The driver will "chop" the 12 volts to limit the current and keep the motors from burning up, assuming you do your part in adjusting them correctly. I'm looking at your blog, I guess you have the extruder stepper already. PWM stands for "pulse width modulation". It looks like you did a nice neat job on the protoboard wiring.by pica - Stepper Motors, Servo Motors, DC Motors
Helpful for series/parallel arrays. You can play with voltage, LED colors, etc.by pica - Hello. I need a something designed. For money.
Many types of plastic are opaque to visible light, but transmit IR. A thick piece of cardboard or something ought to be usable. I wouldn't go on to wiring up the motors until you have the bugs worked out on the endstops. If that LED is not functioning I'd fix that first. It's entirely possible that the LED is burnt out. You can check to see if your opto part is emitting if you happen to have aby pica - Controllers
slightly off topic, but 3 AA cells will give you over twice the power at usually a lower price. Is your personal lighting device using white LEDs?by pica - Hello. I need a something designed. For money.
You want me to just measure them? or do you need pitch diameter, number of teeth, etc? Do you need the numbers so you can machine or purchase a replacement? Small pulley has 8 teeth, large has 20 teeth. pitch is 1/5 inch.by pica - Reprappers
Here are some questions: 1. Are you a beginner at soldering? Is it possible you have a bad solder joint? 2. What are you blocking the opto with? Is it shiny or made of plastic? Try a piece of cardboard or even better, a sheet of metal that has been spray painted black. 3. Do you have 5 leads on the opto part? If so then they can only go in one way, (because of three pins on one side, two on tby pica - Controllers
The only printable motor designs in my head right now would be to use a solenoid type coil to nudge a ratchet mechanism. You would probably need two coils to spin things in both directions. The coils are the most practical type of motor coil to hand fab. We could print the spool, and we could also print the spool winding machine. You sill would need to get the enameled wire. I don't see extrudiby pica - Mechanics
D'oh, I haven't seen, touched or bought the electronics, but I'd guess from here it looks like you might have a bad pot. Sometime the little itty-bitty parts are rated for only a few cycles. (Toggle switches on a circuit board are something else that comes to mind. They're pretty scarce nowadays because jumpers blocks have got to be cheaper and more reliable) Do you have any soldering skills? Isby pica - Controllers
Good to know, but I was sure that I've read that someone blew out a stepper board thanks to that oversight. Maybe that was adjusted wrong or something. I see that 12.4 volts = 2 amps x 6.2 ohms. Traumflug Wrote: ------------------------------------------------------- >> I think they need a resistance of at least 6.2 >> ohms > > It doesn't matter how many Ohms a motor has, thby pica - Stepper Motors, Servo Motors, DC Motors
Is anyone doing this? I just found some cheap (54 cent) sensors: I had no idea they were so cheap. They look cheaper than opto endstops and inductive sensor endstops, and just about par with just using electronic push button switches. nophead, back in 2007 talks about using them on his x-y table, but is sounds like the table came with them installed. Is anyone else using them? It looks like thby pica - Controllers
The coil resistance on the linked 0.9 steppers is only 1 ohm. Are you using standard reprap electronics? I think they need a resistance of at least 6.2 ohms Someone correct me if I'm wrong, but nophead is using a 6.2 ohm resister for heating the hot bitby pica - Stepper Motors, Servo Motors, DC Motors
or are we not yet there?by pica - Huxley
Also, I recommend McMaster-Carr for wide assortment of cool stuff, a near single source for mechanical parts Fast, fast, fast shipping, like you will have it tomorrow Very clean and easy to use online catalog Easy ordering form I have regrets only from Impossible to get a shipping quote In fact, you will only know the shipping cost when the package arrives Unless they forgot to pack a copyby pica - General
Thanks, To create a link to a part for McMaster-Carr you just do this: hxxp://www.mcmaster.com/#7573A63 Replace the "xx" with "tt", (done this way so the Phorum won't shorten into a link). Sometimes there 's some "cruft" at the end of the part number that you can leave off. The item above is 2000 degF High-Temperature Silicate Adhesive, which I've bought but not tried yet. Hopefully it wilby pica - General
Ok, I'm thinking ahead to my next machine, even though I've not finished my first. So does anyone have a list of hardware that they ordered from (preferably) McMaster-Carr to build their Huxley? I'm thinking along the lines of by Nyarlathotep which I found very handy for my own purchace (reworked and posted on my blog as "beta" here: ) I know I've seen flickr photos of US made Huxleys, and Iby pica - General
peer Wrote: ------------------------------------------------------- > Like this: > > > o.jpg Cool, upload that to thingiverse so there's a decentralized source of supply ;-) After all, isn't that the Reprap way?by pica - General
Traumflug Wrote: ------------------------------------------------------- > If "extruding something" is your only goal, buying > a finished machine is the only choice making > sense. There's no point in discussing options, as > this wastes time None were readily available without an unreasonable price tag or a long lead time.by pica - General
The non-experimental hardware has the driver boards hardwired to a fixed stepping setting. On Mendel, I think some people are single stepping on the z-axis, (where a full step is such a small amount due to the screw thread), and half or quarter stepping on y and x-axis, at least with the Pololu A4983 stepper controllers. I think the trade off is: Full steps: Faster, nosier, less resolutionby pica - Stepper Motors, Servo Motors, DC Motors
Thanks for the feedback! Traumflug Wrote: ------------------------------------------------------- > > Extruding is just as realistic as with any other > machine, as it uses the same electronics and the > same extruder. A Wolfstrap is faster than a > McWire, because it uses M10 rods (1.5 mm pitch) > instead of M6 (1 mm pitch) and acceleration > strategies in firmware haveby pica - General
I can't believe you didn't get a response. Maybe you got some PMs? I suggest reposting in "Job Shop: I need stuff made!" part of the forum. Use "" in the title if that's where you are located. Good luck! Delcamhealthcare Wrote: ------------------------------------------------------- > Hi! > > I work for Delcam Healthcare and we provide CADCAM > solutions for medical applicationsby pica - Reprappers
Traumflug Wrote: ------------------------------------------------------- > Building a Wolfstrap costs about $300, with about > $200 reusable for the Mendel. Do you think Huxley > can be even cheaper? You weren't responding to me, but I'll answer anyway. Here are the issues with a Wolfstrap, (you may chose to read this as "Why Mark won't be building a Wolfstrap".) 1. While documentationby pica - General
VDX Wrote: ------------------------------------------------------- > ... i measured some > inductive sensors/switches from Pepperl&Fuchs i > found in my scrap, i measured one (rectangular) > type with 50 microns hysteresis and 2 microns > repeatability ... Ah, I just searched for "inductive sensor|switch" and found some examples. While they may work great, they're not in theby pica - General