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(Contents under pressure) -> http://objects.reprap.org/wiki/Paste_Extrusion
Re: stepper motor question (again...) - 16 years ago
That is almost chinese to me. Okay what I do understand is: with the configuration planned I will not have to worry about the 12V thanks to the chopper I can limit the current to the desired ~1.3 amps I should check whether or not to use half or full coils regarding speed and torque But where I get lost is the temperature. I did not care about the motor heat dissipation, in fact I never thoughtby sid - Controllers
Re: Cheapo mouse as shaft encoder - 16 years ago
I've read a small article on some equal subject almost a year ago. alberto ricci bitti (very smart guy indeed) mentioned to use a mouse as a relative x-y encoder, because that is exactly what it is Would be nice if we could use a mouse not only to have the shaft encoded but to have the repetitions of the RepRap's movements checked too. 'sidby sid - Controllers
Re: stepper motor question (again...) - 16 years ago
peteredworthy, the 1.4 came from the formula nophead just posted, with a nice error in my headcalculation or let's say guestimating to simplify I took 2Amp instead of 1.8 to come up with nothing more than the sqrt2 itself .. there I forgot the last step reducing 10% Well as far as google told me the motor can be run with up to 5V (at least that's what I think -language issues-) And yes I've reby sid - Controllers
stepper motor question (again...) - 16 years ago
Salam mes Amis, I got hold of some stepper motors the other day, and now I'm wondering if I could give them a try. Those are sanyo denki 103g771-0611 unipolar motors (6-wire) rated 2,46 V and 1,82 A Am I right to assume that if treated as bipolar motors they have a current of about 1.4A which could be handled by the L298? thank alot for your help 'sidby sid - Controllers
Re: CherryPal - 16 years ago
I'd prefer some via epia pico its small (100x72mm) it's powerful enough (via c7 1ghz, 1GB RAM, 4usb ports etc) and it runs on 12V so it can be attached to the same powersupply as the RapRap itself. and it looks nice 'sidby sid - General
Re: linear magnetic encoder - 16 years ago
Great idea, why not take one step further? "glue" the tape on the axis and mount the head on the sled. Now you're close to what other linear encoders work like... should be possible 'sidby sid - Mechanics
Re: Hi german reprappers, where are you? - 16 years ago
Keine schlechte Idee, aber wenn ich richtig rechne heisst das entweder 65 Euro pro Motor, oder 45 pro Motor plus 30 pro Steuerung (75) das kommt irgendwie nicht aus Und ICs einzeln sind auch keine Hilfe, wenn ichby sid - Schwarzes Brett
Re: Rep(St)rap design - 16 years ago
for the x-Axis ? yes. but only to synchronize the leadscrews. But only to not have to mount a fourth stepper. Now, guide rails are approximately the correct length and z-Axis is present: still without leadscrews and Motors and so forth. Today I'm going to cut and drill my chopping board to pieces (hopefully) I'll keep you updated 'sidby sid - Mechanics
Re: Hi german reprappers, where are you? - 16 years ago
Hallo, mitten aus dem Kohlenpott heraus winke ich mal vertrby sid - Schwarzes Brett
Re: Rep(St)rap design - 16 years ago
I got me some bush bearings (simple ptfe multilayer) those will be pressfit; maybe glued, grub screwed to the structure. fixed side will be grub screwed. Or did I get you wrong? 'sidby sid - Mechanics
Rep(St)rap design - 16 years ago
Hi, I'm currently ordering some items to build my (yet very) own RepStrap. The design itself is almost done, based on a 3cm thick chopping board made of PE I'm pretty sure it can also be done in ABS or PCL. Now I'm wondering if that is a RepStrap (because it should build a complete RepRap) or is it a RepRap (becaus it can duplicate itself too) ? Well, nevermind what it's called, tell me what yoby sid - Mechanics
Re: A Dot Matrix extruder - 17 years ago
what about the famous spitbag-style? If the extruder should extrude, theres a spitbag placed under the extrudernozzle ( that may be a spoon or whatever) everything that will drip will not drip onto the print but into the spitbag That is not elegant nor beautiful, but it can help reducing the unwanted threads. *justthinkingaloud* 'sidby sid - General
Re: A Dot Matrix extruder - 17 years ago
I would think of an e-magnetic shutter instead. Shouldn't be that much a controllerProblem (open if extruderbarrel is turning, shut if not should do I'd guess) But I see a problem about cold material that keeps the shutter from opening Maybe something like a needled nozzle, if the needle is heated it'll be okay. 'sidby sid - General
Re: A deviation - 17 years ago
dracolytch, well of course you can make any shape, as you can on any ordinary 2.5d system... but if you want to make any circle that is ofcentered the turntables axis, you need to lock that axis! (in other words.. it's useless therefor) cheaper to construct? an additional axis? I don't think so. 'sidby sid - General
Re: pcb-home etching // home printing? - 17 years ago
I've just found an ebayauction that offers very affordable pcb making... I'd guess I'll quit my "do it at home"-tryouts. 'sidby sid - General
Re: pcb group buy - 17 years ago
I've just seen an ebay auction for pcbs... seems to be very affordable (chinese production, retailer around my corner) the price is 60 Euros... per squaremeter (single sided, hal, solder resist included) or 110 Euros double sided (if i calculated right thats less than 90cent per controlercard and about 50 cent per powercom!) see ebay auction# 290118797925 for reference. If you like me to ask (by sid - General
Re: pcb-home etching // home printing? - 17 years ago
inkjet, true... what you say is, that I will need something similar but a laserprinter, right? thanks for the hint, didn't know that let me see what our officeprinters (some oversized laserprinters) can (cd-printing) next week and if...well we'll see. 'sidby sid - General
pcb-home etching // home printing? - 17 years ago
Salute adesso... I've read about those hot-iron-printout-transfer-stuff at instructables, that let me think... My printer (canon pixma) is able to print CD-Rs and DVDs, so why not print directly on a small sheet of circuitboard, then etch at home? that would be much easier and there would be no transfer errors the only thing that's bothering is that if I want to print, I have to name inner andby sid - General
Re: A deviation - 17 years ago
I think it's necessary to be able to move the axis of the turntable, otherwise you can only make concentric circles, but no ovalshapes nor two circles or anything else. So..... It's quite entertaining to think about a turntablesystem, but in fact it's mor difficult to handle than an ordinary 2.5d system. 'sidby sid - General
Re: Surface mount components, glue and tape? - 17 years ago
I'm not quite sure if I got you right... but why should I do it that way and not just solder the chip directly? It's not as difficult as it seems to be, just solder almost everything then use some desolder --I don't know what it's called... entlby sid - General
Re: Aluminum (aluminium) printing - 17 years ago
Uuups, your right Zach! Lasers are dangerous, even the 200mW DVD-Burner thingy I'm currently playing around with is hot enough do sting your skin, no need for talking about eyesight after looking into the beam (there will be none left) And keep away from the infrared lasers until you're absolutely sure that it doesn't emitting light. If you don't see it, it doesn't mean that it isn't there! I dby sid - Powder Printing and Selective Laser Sintering
Aluminum (aluminium) printing - 17 years ago
Hi, I've seen your toolhead-idea "Laser etch tool" especially the link mentioned: So, what to do with my "I don't like to read CDs anymore" DVD-Burner laying around? Exactly! Now I do have a 200mW red Laserpointer, that's capable of burning plastics. Exciting, isn't it? So I was looking for the Tim Taylor version... "more power" And: there are lots of people selling Laserdiodes at ebay... 2 anby sid - Powder Printing and Selective Laser Sintering
Re: cool stuff to try - 17 years ago
Uh yes.. that's exactly what I want in my "garage"... burning thermite... One bad spark in the "I got me some kilos thermite and store it right here next to the fire"-bucket, and you'll be having a nice "burn the house down" barbecue I'd guess, that'll be a fun thing to watch..... but NOT AT HOME! nevrmind, but if you try that for the first time: use as few thermite and be as far as possibleby sid - Casting and Moldmaking Working Group
Re: Modified ink printer churns out electronic circuits - 17 years ago
then I don't say a word about the new metal-line system they have including a cnc controled system uups... sorry Oh this thingy doesn't need any space, under the bed is enough (or on the table if you want to work) Never mind. that's also a neat way to repstrap i guess.. 'sidby sid - Polymer Working Group
Re: Modified ink printer churns out electronic circuits - 17 years ago
Hi Forrest... I guess what you "need" is an emco unimat (the system was sold to cooltool in the late 90's afaik) here's a link for gbp200 you'll get a mill (horizontal or vertical) a drill press and a metal turning lathe, just puzzle your tool as you need it. All in the size of two shooeboxes take a quick watch at ebay, they're sold recently for less than 100 Okay, what was the topic? Yeby sid - Polymer Working Group
Re: Modified ink printer churns out electronic circuits - 17 years ago
just AWESOME! That's what makes homemade circuitboards easy to build doing that on a penplotter should reduce passes to ONE, A Penplotter can be made out of any reprap ... That's what this project needs, making it's own circuits. Only a mill and a lathe to homebuild the steppers, and it can FULLY rebuild itself! 'sidby sid - Polymer Working Group
Re: The rebirth of the peristalic pump? - 17 years ago
hmmm perfect pump: but expensive 'sid sorry for advertising expensive resinpumps...by sid - Paste Extrusion Working Group
Re: The rebirth of the peristalic pump? - 17 years ago
I'm sorry.. I was sure one of those eccentric pumps was already reprapped !? I can't find that anymore so maybe I just grow nuts 'sidby sid - Paste Extrusion Working Group
Re: The rebirth of the peristalic pump? - 17 years ago
Nice.. sure... But i guess pretty complicated and expensive to build one of these.. You need a crank shaft, some .. how do you say Kipphebel? rocking lever?? and the pushers.. and of course a bed for the tubing... that's why I guess it'll be easier to build one of those extruders or a pump like that one I do not fnd anymore (I'm sorry, but a search for the wiki could be quit useful ) basicaby sid - Paste Extrusion Working Group
Re: Carburetor Jet as Nozzle - 17 years ago
Hi Zach.. I got that idea from the Weber 44idf carbs I once had in my car.. see picture upper left.. new quite expensive but any beetlestore should have a fistful used ones for a few cents, as I said I got them for 50cent/each they are not threaded but threadable Go and ask for weber (vw-beetle (not the new.. the original), porsche.. even better VW-Porsche) or dellOrto (Vespa, Lambretta) that'by sid - General