On Tue, May 30, 2017 at 9:02 PM, David Niklas doark@mail.com 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.
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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.