Trystanlea: yep they're one piece - router bit in a pedestal drill, makes a crude millby Triffid_Hunter - General Mendel Topics
once I got the template set up, to print to scale all I do is open the template, import some models, move them around until they look nice and hit render. not sure how it compares to other cad tools since I've never found one I could 1) wrap my head around and 2) afford.by Triffid_Hunter - 3D Design tools
644 is an enhanced version of the 168, however it probably has more pins and a different pin-out, so can't just drop it into the board. now that I think about it, your 10MHz '168 will probably run fine at 16MHz.. atmel chips overclock very nicely as long as you don't run them close to their voltage limits, and afaik the extruder gives it a healthy 5v (lower limit is 2.7v iirc) if it blows up, dby Triffid_Hunter - Controllers
I don't think the length is particularly critical, although longer lengths allow you to spread the heat more evenly. The resistance of the length you choose however is directly related to the current that the wire consumes, and hence its heating power. A thinner gauge at a longer length simply spreads the same amount of heat over a larger area, so we specify resistance rather than gauge and lengtby Triffid_Hunter - Reprappers
latest motherboard uses atmega644p ala sanguinoby Triffid_Hunter - Controllers
been on the main blog since 4 days agoby Triffid_Hunter - General
600DPI, A4, print-ready images for those who are interested. make sure you turn off page margins, and set scale to 100% or dpi to 600.0 or it won't be to scale. Use the rulers on the page edges to check - marks are every 5mm, with larger marks every 1cm. I'll post more as I need them for my own wooden mendel. Pictures of Z motor brackets up soon!by Triffid_Hunter - General Mendel Topics
surprised that I didn't find a link to The Blender Precision Modelling Tutorial here, since it's the *most* relevant url for this thread out of the whole internet!by Triffid_Hunter - 3D Design tools
you would have to recompile all the firmware for the new F_CPU, updating baud registers and any other timing-dependent code. you may also have to print slower. Also, the 168 is apparently too small for a lot of the recent firmware so you may have to be careful with versions too.by Triffid_Hunter - Controllers
the bearings were about AU$1.20 each here.. maybe they're cheaper in countries that have actually managed to convert to metric?by Triffid_Hunter - Mechanics
5mm internal I think for X and Y - whatever matches your motors. remember, Z motor needs a pulley too, so 3 with 5mm ID and 2 with 8mm ID. The pitch is 5mm, and remember to get a belt with a tooth profile that's ok with tight radiiby Triffid_Hunter - Mechanics
max232 is your friend. reference design should work fine for you. the advantage of usb over regular serial is that it's designed to provide power too - you'll have to power your board some other way.by Triffid_Hunter - Controllers
<-- some of my prints are here, not sure if you can get the originals (4960x7015 600DPI PNG) from flickrby Triffid_Hunter - General
SebastienBailard, some of the parts are quite tricky to cut from wood (router bit in pedestal drill = impromptu mill), and I have to be careful of which way the grain goes or many parts are too weak and break when tightened. I found a most excellent blender CAD tutorial which I've used to get scale print-outs of the faces of many of the parts, which helps immensely.by Triffid_Hunter - General
I think getting a consistent layer height would be very difficult, also the rope would stay full of plastic after depositing some, so you would have to heat the rope's whole path, or somehow design pulleys that still work when choked with solidified plastic. Perhaps use a belt instead, and only putting plastic on one side? Even then you would have the complication of having to rotate the extruby Triffid_Hunter - Mechanics
I'm already planning on trying a conveyor with my mendel once I have the basics working.. just so I can do really long runs of parts and have them drop into a bin when completeby Triffid_Hunter - General
it *is* a bearing, unless you mean a different extruder..by Triffid_Hunter - Reprappers
I've been using blender to get scale print-outs of pieces so I can glue the print-outs onto wood and cut them out. see for the tutorial, specifically around page 72 of the pdf guide, or part 10 of the 608 bearing tutorial. blender is quite similar to 3ds max, but it's open source and free so worth checking out. the part is 33lx13wx15h, captive nut hole centers are 19mm apart.by Triffid_Hunter - General Mendel Topics
I'm in australia, making a wooden mendel. all metric, although having some imperial stuff around is quite handy - try getting an M6 threaded rod (I'm using M6 instead of M8 because I already had it) through a 6mm hole without lots of banging and cursing! 1/4" (6.35mm) drill hole is perfect though, enough clearance for easy sliding but still small enough for the washers to get a good grip with noby Triffid_Hunter - General
so.. any idea who was DDOSing us and why?by Triffid_Hunter - General
my wooden mendel frame is up! got blender working too - had to force software rendering. difference in render speed is unnoticeable with the few polygons and effects in reprap parts while doing CAD workby Triffid_Hunter - General Mendel Topics
my wooden mendel frame is up! got blender working too - had to force software rendering. difference in render speed is unnoticeable with the few polygons and effects in reprap parts while doing CAD workby Triffid_Hunter - General Mendel Topics
those are built into the chip...by Triffid_Hunter - Controllers
here's how to arrange your studding pieces (incl. jigs) so you only need 8 instead of 9: 1: A, D2 (142mm left) 2: A, D2 (142mm left) 3: C, D1, E (21mm left) 4: C, D1, E (21mm left) 5: C, C, B (42mm left) 6: B, J1 (340mm left) 7: B, B, J2 (26mm left) 8: B, B, J3 (103mm left) (letters refer to Mendel Assembly Data Sheet) I came across a few arrangements with some rods having only 6mm left, but tby Triffid_Hunter - General Mendel Topics
just got my bearings from Small Parts and Bearings. There was a small hiccup in the ordering process whereby it didn't get confirmed for a week, but they were very good about it, and gave me free shipping in compensation. I get the impression that heads may have rolled. Order arrived in double-quick time, and I can't wait to try these little bearings out!by Triffid_Hunter - General
grael: C made little to no sense to me until I'd built large (multi file, multi library, relocatability, etc) projects in assembly. Now I understand how C short-cuts most of the details while still remaining very close to the machine architecture, and can write clear and effective microcontroller-suitable C with ease. If you want to give this path a go, probably best to do it on a small chip liby Triffid_Hunter - RepRap Host
anyone considered using an anodised aluminium barrel? anodisation provides a sponge-like layer of aluminium oxide mere microns thick, which is electrically insulating, thermally conducting and should be fairly unaffected by 300 degree heat. At those temperatures, it would effectively be self-repairing against the heater scratching it since it would almost immediately re-oxidise. Another idea I hby Triffid_Hunter - Mechanics
hi guys, finally managed to get a print-out of one face of the frame vertex with added lines through the centers of the horizontal M8 holes, following the guide from rab3d.com's precision modelling pdf, pages 73-88. Macs are infuriatingly difficult to use :/ will glue and cut-out next chance I get, maybe wednesdayby Triffid_Hunter - General Mendel Topics
datasheet page 6 says it depends on whether MS1 pin is high or lowby Triffid_Hunter - Controllers