On Tue, May 30, 2017 at 9:02 PM, David Niklas <[email protected]> wrote:
>> only by going to a 32-bit processor running at say 100mhz can you get >> the timing synchronisation back. > > I understand now. I thought that the arduino was faster... neeeh. they're.... well... not very good, basically. also the arduino base code.... *sigh* it does timing loops to get accuracy by hand-coding them in assembler with NOOPs (no operation). as a programmer, you know what that means... :) >> >> david crocket (dc42) has specifically designed the duet series so >> >> that you can consider exceeding PWM rates of 150 khz, which is what >> >> you need if you want to sustain 500mm/sec for example (and do not >> >> want problems to occur at speeds well below that). >> > Link? >> >> google it please. > > This looks like it: > http://forums.reprap.org/read.php?147,33082,471483 yehhh that'd be about right - a good example, and really highly technically informative and insightful. good find. > >> >> also i forgot to mention that i've been using the E3Dv6 "volcano" >> >> which, when you use a 0.5 to 0.8mm nozzle can easily do flow rates of >> >> something mad like.... 200c^3/min - particularly when combined with >> >> the huge 40:1 gearing of the flex3drive which can *accurately* >> >> deliver the kinds of torque needed. the volcano basically turns the >> >> heat chamber round, so that the heat area is 20mm long instead of >> >> the usual 10mm. >> > Torque for what? >> > Again, maybe a link would help us stay on the same page. >> >> google them, please. i have a lot else to take care of. > <snip> > > I thought you were waiting for the PCBs to get done (which was going to > take another week I think), yehyeh.... still waiting: mike has family issues as well as pressing production to deal with, he's got one side of the PCBs done, the other side is next. > and had nothing better to do than play with > that oh-so-giggly-and-fun little girl in the youtube vids? :) my daughter's currently in the US, her grandmother's 80th birthday was this month. ok so i re-read what i wrote a bit, one of the reasons why you can't push extruders beyond a certain point is because the heat chamber can't keep up with melting the filament fast enough, but also it takes quite a lot of pressure to do that. if you can get higher torque out of the motors by having a 40:1 gear ratio instead of the usual "direct drive" or maybe 3:1 or 4:1 as is usual even with the mendel90, lulzbots and so on, you have enough torque to be able to do it. that's what i meant. l. _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
