The motors run at 12v but steppers are current devices not voltage I run my CNC steppers (3.6v) at 35v but control the current, a higher voltage gives better response. The V1.0 electronics doesn't control the current and as such the motor has to limit its own current due to its resistance i.e 12v 6 Ohms = 2A which is the continuous rating on the L298by Ian Adkins - Mechanics
Hi Dylan You need a Nema 23 motor this is the mounting flange spec and is 57mm x 57mm approx to be exactly the same as Darwin it should be 51mm long, but if longer it would be no problem on X or Y and would just reduce Z travel by the over size. The double shaft is needed on the Z axis only. As for Voltage, Amps etc, if you run V1.0 electronics then ideally the motor should draw no more than 2by Ian Adkins - Mechanics
Hi Nophead Adrian has done a 100kg purchase of CAPA should be arriving in the next few days, we will then convert 50kg to filament, on 2kg rolls expect to be aboutby Ian Adkins - Reprappers
Please look at www.bitsfrombytes.com we can supply moulded version of the printed partsby Ian Adkins - Reprappers
A complete Darwin kit is expected to be aboutby Ian Adkins - Reprappers
What electronics are you using as the V1.0 electronics don't have current sensing so increasing the voltage will increase the current, I believe there is software control for this but be careful. The RepRap only moves 1 motor at a time but as with most steppers will over-drive the motor with peak current up to 2A I think. In summary I would go with the Dremel if you have it and just watch the vby Ian Adkins - Controllers
I don't think these motors will work with the non Arduino electronics without using a series resistor to get the coil resistance to minimum 6 ohms so in bipolar-series you would need a 2.4ohm add-on minimum 20 Watt I would suggest. With the Arduino electronics as Zach said they will be sweet.by Ian Adkins - Mechanics
We should have the Live CD on bits from bytes for download tomorrow/ next few days if that helps, it will be the first thing in Software section, I'm with you on Java etc except I only drink Tea!by Ian Adkins - RepRap Host
Excellent thanks for that, yes we do both varieties I will get both on the web later today. Shames Plug addedby Ian Adkins - Reprappers
They are in the moulded parts, trying to keep the cost down . The moulded parts also include all the captive M5 nuts & the extruder now has cast in bearings saving on the half bearingsby Ian Adkins - Reprappers
I've signed in with my google account but can't see how to enter my location can someone do an idiots guide please as this idiot needs it!by Ian Adkins - Reprappers
I personally like the PIC solution (mainly as I've been programming them for years and have all the programmers etc) Some of the problems are very easily fixed, I'm just about to build the Extruder controller but with a slightly higher spec pic 16F88 which has an A-D and as such should sort the temp control issues, I will also be adding a Stepper Driver as Zach is absolutely correct the stepper dby Ian Adkins - Controllers
Hi Viktor to right microstepping does add resolution but not precision a stepper has an accuracy of +- 5% of full step i.e. 0.18by Ian Adkins - Mechanics
When we are self producing RP parts we will be at the $400.00 mark no problem as it stands today we should be able to do a complete inc electronics forby Ian Adkins - Reprappers
Hi Natural is an off white it should say on the web site but i will try and put up a colour swatch, if we sell enough Moulded parts the price will drop as it is the actual mould materials that are so expensive and have a limited life! I will PM you with the shipping details.by Ian Adkins - General
Sorry guys the final push (as always) took longer than expected!! the parts are now available . we will have complete kits for Hardware in the next day or two followed by full kits with electronics and programmed chips etc. I will post the builders blog later todayby Ian Adkins - General
I also landed on Fab@Home first then followed a thread and got here, the Fab@home definitely is designed very much with asthetics in mind and I feel the RepRap is more about function (which brings its own beauty). Kits are now available for Moulded RP parts for the RepRapStrap with complete kits in the next few days and much cheaper than the Koba Fab@Home I'm hoping this will move the RepRap prby Ian Adkins - General
I agree on the forum idea while we all hate structure as projects grow you have to get structure or you will get chaos, and with the complexities this project will definitely get into, chaos would really slow development. Then Zach may never get another Tattoo! (how big will it be?)by Ian Adkins - General
CAPA filament should workout closer to $15/lb,by Ian Adkins - General
Hi I'm about to buy all the parts this side of the pond also, I've not fully looked at the list but will do tomorrow or Wednesday it will all come from RS or Farnell from UK stock i.e free delivery I would be happy to send you a copy of the orders, I sort of design electronics for my job so i should be able to ensure any alternatives are electrically correct. Do you have accounts with both? Iby Ian Adkins - United Kingdom RepRap User Group
Hi AcidHell2 Which part of Bristol I'm from Clevedon so very close by I'm sure. I'm hoping to post pictures this weekend, I have a few items to machine and to splice the Z belt together (no electronics yet!) but will test with some other drivers i have. Ianby Ian Adkins - United Kingdom RepRap User Group
Hi mimarob STL is the standard used in RepRap and most 3D printers but it's not very good for engineering (or 3D printing!) but is the universal standard. It's a surface made up of triangles and can be read as a text file of coordinates. DXF is a standard used for 2D drawing and you can get dimensions from it directly, I believe you can also get dimensions from STL files but never found free sofby Ian Adkins - Mechanics
Just be sure on the Torque they are much less than the currently spec'd motors 0.35Nm as opposed to 1.06Nm I'm sure this will not be a problem, I will be able to confirm this very soon when I test my moulded RepRap as I'll take current readings. This will also give the advantage of less heat generated in the electronics Ianby Ian Adkins - Mechanics
Hi Zach Sorry i looked at the Web Page and the mounting hole dimensions are different to the datasheet which as you state is Nema 23 next time I'll pay more attention. Ianby Ian Adkins - Mechanics
1 Bar will easily hold the HDPE down the problem will be getting 1 Bar at the HDPE/MDF boundary. Standard vacuum cleaners produce much less and there are always sealing issues. Commercial 1 Bar pumps are just to expensive to be a viable option. We will probably see in the order of 0.1 to 0.2 Bar but this is still nearly 100g per sq cm so maybe enough. It will all be in the testing! Ianby Ian Adkins - Reprappers
Hi Zach That motor is cheap but not same spec as currently used. I'm sure it would work but it will not fit the RP parts as standard and is considerably less powerful (although i think the current motors are larger than needed). I've not given the required time to really investigate the Arduino yet as I've been full on doing moulded parts (nearly there) but certainly Micro-stepping is the wayby Ian Adkins - Mechanics
Hi Nophead I have a fully vacuum pump (1 Bar) and this will suck through 18mm MDF! I was certain (but not tested) that a Vacuum Cleaner would work through 3mm but maybe it won't. Have a good holiday and I will try and test how best to achieve a home brew Vacuum table (I need one for milling myself anyway) and I'll report the results, fortunately I have a vacuum gauge so should be able determinby Ian Adkins - Reprappers
How about a simple vacuum table to hold down the thin HDPE sheet, MDF is porous and will allow a vacuum to suck through it. Using some tape to seal the edges and exposed areas will give you good holding force even with a moderate suction. My Henry vacuum cleaner pulls about 0.3 Bar (4.35 PSI) the HDPE will have no mechanical advantage and I would suspect to could not produce this kind of force (by Ian Adkins - Reprappers
With the new Arduino boards or the existing boards with the Half step enabled you can use a standard 200 step motor Nema 23 these are much cheaper in UK aboutby Ian Adkins - Mechanics
As soon as i have checked fit of the parts I should be able to make 4 or more sets per day if required, so I'm fairly sure I can meet even an initial high demand. I have been asking people to Private Message me so I can get a feel for demand which at this point seems quite easily achieved. The day is drawing very close when there will be many a RepRap(strap)by Ian Adkins - Reprappers