On Fri, 19 May 2017 01:42:52 +0100 Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
On Fri, May 19, 2017 at 12:35 AM, Neil Jansen njansen1@gmail.com wrote:
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now, neil, this is the kind of speed at which an arduino 2560 *cannot cope*, and, also, where the design flaws inherent in RAMPS - using prototyping Evaluation Boards (polulu-style drivers) - start to show up.
Could you be more specific? Why can't the arduino cope?
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?
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.
none of this stuff i knew about, the 18 months before i began designing the laptop's parts. oh well.
I researched 3D printers thoroughly before I bought mine. I even started asking questions at a forum, and I'm still not too certain if I got what I sought. According to this list, I did worse when looking for hacker boards. So, you are not alone.
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welcome to the list neil. really good talking with you.
l.
Indeed.
Sincerely, David