Hi all, I am finishing the build of a Mendel Prusa w/ RAMPS 1.2. Got SYSTH47-1684B steppers which are rated at a relatively high current (1.68 Amp). All goes well, but I have a couple of issues with the z axis. I'm finding the one pololu/stepstick driver per two motors solution a bit anemic, only very slow speeds in the ascending (Z+) direction are tolerated . I'm ready to try one stepper driverby Lanthan - General Mendel Topics
NoobMan Wrote: ------------------------------------------------------- > I guess i will have to open my head to pcb > milling. > Although i am more like traditionalist in the sens > of "shortest way is the one i know". > I am working on a stiffer cnc router -eta in the > spring- and i should certainly test pcb milling on > it then. > > Thanks for the push on that dirby Lanthan - Next Wave Electronics Working Group
NoobMan Wrote: > @Lanthan: double sided milling a board - how is it > done, is it complicated, is the margin of error > too big? Usually ppl use symmetric register pins, as has ben pointed out. Personally I haven't yet tried it, but I see no major problems. I'm on my second milled project, just posted pics of the first in the wiki (pcb milling) at the very end of the page. It is comiby Lanthan - Next Wave Electronics Working Group
To Korban: yes, any time invested learning un*xes is time well spent and finally pays off wonderfully. Me: > > Does anybody know about an equivalent of the > Timer1 library for the Sanguino? Traumflug: > > Hmm. What's the Timer1 library, what's wrong with > it and to where do you want to port it? Timer1 library for arduino (atmega168, atmega328) http://www.arduino.cc/playby Lanthan - Next Wave Electronics Working Group
Some thoughts about MOSFETS I recently completed a milled pcb with the exact same MOSFETS circuit extracted from gen7 (my interpretation "gen 7 simplified", posted some time ago in this thread). I was able to verify it is working perfectly with arduino hardware PWM at 32 KHz (Timer1 library). Intention is to drive a small spindle. Wondering if: 1) Might be a good idea to move those MOSFETS toby Lanthan - Next Wave Electronics Working Group
Another suggestion - saw this in some electronics site, and indeed it does make sense: the MOSFETS should be mounted either on sockets or screw terminals (whatever you prefer), as they tend to burn/short out for many reasons closely related to tinkering/experimenting, and they need replacement. Better to factor in an easy way to change them,, the cost of the terminals/sockets is well under the cby Lanthan - Next Wave Electronics Working Group
NoobMan Wrote: ------------------------------------------------------- > As i am a toner transfer noob, i want to ask if > the board is intended to be suitable for diy > purposes. Certainly! As for my branch of mods, I am aiming to PCB routing of Voronoi regions rather than toner transfer. I just got a full proof (a couple of h-bridge boards) that this toolpath is working flawlessly, aby Lanthan - Next Wave Electronics Working Group
Maybe in the top right part, by moving the other connectors? Why not? Parag0n, if you have access to gEDA, could you check if there is a footprint for that particular Molex 4-pin connector? L.by Lanthan - Next Wave Electronics Working Group
Triffid_Hunter Wrote: ------------------------------------------------------- > adding a 100k pull-down should help when powered > off, and during start-up when the pin is an input. > after that it should have no effect. I recommend > adding it. It is there! (R11, R12 and R13 are 100K, between GND and the gate)by Lanthan - Next Wave Electronics Working Group
And here are the latest files with the above mentioned changes. Also, just in case one might find some uses for the unused pins, there is a keyable header with 5 lines +5V and GND. L.by Lanthan - Next Wave Electronics Working Group
Traumflug: Thx for the invitation, I'll make a github account, hopefully this WE... yes merges seem to be more involved than for "just code"... yet they are all text files. I think I have come to a solution for the crystal and related condensors approaching Atmel's recommendations, mostly surrounded with ground and near the pins Triffid Hunter: good suggestion! Indeed I had'nt seen this in the vby Lanthan - Next Wave Electronics Working Group
You guys have convinced me ;-) let's go for Mosfets, IRL3803 seems OK. To Rocket Scientist: we need the power transistors/mosfets to drive heaters, fans, in my case also a small dc spindle... as for the stepper motor part, is is entirely dealt with the four pololu/a3983 stepper drivers on top. Last night I started doing the modifications to the schematic and the board, also got that crystal fromby Lanthan - Next Wave Electronics Working Group
Thx for input. The Voronoi trace isolation is looking good (or at least, psychedelic ). I thik I'll further rework it to get rid of some mentioned connector oddities, harmonize pinouts, etc. (preferences?). Must also check the size of the copper plates I have. At least, the pgbtogecode toolchain appears to be generating usable results. I hope the drilling ops aren't mirrored against the rby Lanthan - Next Wave Electronics Working Group
I more or less finished adapting this thing to my needs and preferences. Learnig, slowly. No more rats at least. I expect to use it with a FTDI cable. My changes: * Gone are the ATX connector and specialized 5V circuit. I have no need for this. Less components, less hassle. * Screw connectors (that is what I have in stock, and that is what has worked best for me till now) to connect any poby Lanthan - Next Wave Electronics Working Group
I think I got the ICSP header right now (layout pin numbers modified in the library), and a bit less jumpering. Also got all of the endstop connectors harmonized to a 1 GND 2 +VCC 3 SIGNAL both in the schematics and the PCB. Couldn't change the pinout of TEMP and TEMP1 Most bad rats are gone, but still getting a couple of warnings: Warning! net "+5V" is shorted to net "GND" Warning! net "+5by Lanthan - Next Wave Electronics Working Group
Mike, Thank you for the pointing me in the right direction! I am beginning to see what is going on. I was indeed getting this short-circuit problem when doing the "optimize rats nest". I just verified it is inherited from Traumflug's git source. Will try the suggested cure. My aim is of course to have a single sided board that I can engrave with the CNC. I do not mind if It has some vias and "zby Lanthan - Next Wave Electronics Working Group
Hi all, I corrected the ISP header pinout (it was still wrong like in Gen2OnABoard) and connected it back, I think too it will certainly be of some use. New pinout: 5 3 1 6 4 2 I realized too late that the correction should have been done in the component in the library, which is still untouched (to do). I fear the name of the component disappeared, and the trials of auto-routing weby Lanthan - Next Wave Electronics Working Group
Hi all! I am using ubuntu Lucid with RTAI above all because I use it to run my 6040 CNC router with emc2 (http://www.linuxcnc.org). This machine, like most, has a native configuration in mm, but the gcode generated by pcb2gcode begins with a g20, so all the following in the file is in inches (this means it is translated in real time, and what I see on screen is still in mm). Haven't yet triedby Lanthan - Next Wave Electronics Working Group