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  1. W

    Model engine CDI easy and cheap

    Buy absolutely anything - a crap Nano for $6 will get you started: Aliexpress Nano Make its LED blink, experiment with the language, figure out how to make its I/O read input and talk to the world, then worry about which one is right for whatever project you want to work on. At the prices of...
  2. W

    Model engine CDI easy and cheap

    Perfectly - thanks! It looks like this would be easy to implement as an interrupt-driven process that simply wakes up uC every time it sees the reference pulse and calculates the delay until it needs to turn the coil back on for the next planned plug firing. For some reason I was imagining the...
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    Model engine CDI easy and cheap

    Could you please provide more information on how you're handling dwell? I see there is someone successfully running small-equipment type engines (kohler, tecumseh, onan, small-HP engines) using a GM inductive crank trigger to provide the pulse for these, but I'm having trouble figuring out how...
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    Linux "Q4OS"

    No, what he's saying is that the software houses (Canonical in the case of snaps and snapcraft) are trying to provide a framework in which "apps" on Linux can be treated like apps on your phone - just pick flappy-birds from the store and it works. No futzing with dependencies, versions, etc...
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    Linux "Q4OS"

    Sadly, these days, "image" means exactly whatever the dolt writing "image" meant. Historically, "image" meant a bit-for-bit copy (a "picture") of some variety of (typically) drive-like media: a CD, a DVD, a hard-drive. One made an "image" of a drive/CD/etc, "burned" (think "projected") it...
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    3D Printer problems - Monoprice/Wanhao D6

    You know what, most of mine are too. I was just up to my ears in the guts of our Stratasys machine, which is the only one of mine that I'm sure is lead-screws all around, so I'll claim that that's the source of my brain fart, but yeah, of course, small variations in pulley diameters are going...
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    3D Printer problems - Monoprice/Wanhao D6

    I've had a different, and reliably-reproducible version of 3 - it took me a while to figure out what was going on when my postdoc started having this problem with his prints, induced by an updated version of Cura: Print-bed temperature too high. I leave a TAZ 6, with a dual-extruder all-metal...
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    3D Printer problems - Monoprice/Wanhao D6

    Hehehe -- I will never understand why people are willing to spend hundreds or thousands of dollars for a device to recreate crap that they wouldn't pay $5 for at the trinket store. I like S3D (liking it less, as they continue to refuse to release an update), but they do seem to have some...
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    3D Printer problems - Monoprice/Wanhao D6

    You might already be further down the rabbit hole than you want? If you already know this and I'm just insulting your intelligence and understanding, please feel free to ignore me, but: Keep in mind that a couple thou difference comes from the extruded ribbon not having a nice accurate...
  10. W

    Model Engine Ignitions

    I should also say, there is absolutely nothing wrong with not currently knowing how to solder, and I applaud anyone who has an interest in learning how to solder and usefully manipulate the pixies. My hat is off to the OP for having the gumption to tackle the project. my comment is solely that...
  11. W

    Model Engine Ignitions

    That only works if you’re willing to pull the plug to reindex the spark, every time you pull the starter. Since the impulse for the spark is created every time the magnet passes the coil, and small engines have plenty of “bounce”, you’ll see many instances of the magnet passing the coil that do...
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    Model Engine Ignitions

    I'll be astounded if we see that it works (interested too, but astounded nonetheless!). I don't believe that the square-wave/equal-time issue is any kind of a problem for the flip-flop solution, or at least whatever variety of problem it may be, is dwarfed by the facts that : A) the thing...
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    Model Engine Ignitions

    Hardly matters. The OP would like to invent a hall-triggered system that only fires once per 2 revolutions of the flywheel. A hall sensor on the flywheel can give good resolution for spark timing, but opens (briefly) on every revolution, and OP would like to cancel one of those. The cam...
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    Model Engine Ignitions

    I think Steamchick is thinking of having a switch that opens and closes only when the hall effect sensor is already closed - so any bounce on the mechanical switch would be invisible as the hall effect sensor is already conducting.
  15. W

    Deals on Alibre

    Heh - "kind of" :) PDF can optionally use some standard fonts, and software that writes PDFs can embed additional fonts/glyphs, but the kicker is that it's not _required_ to use the fonts/glyphs in any consistent way. It's entirely possible (and in some scenarios likely - for example if a...
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    Deals on Alibre

    Purely in the name of providing too much useless information: The problem with importing PDF (into anything - even just importing a PDF of "text" into a word processing program) is that under the hood, a PDF does not contain, or at best only accidentally contains, anything that you would...
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    Ban on small engines in California

    Quite obviously, this "general truth" is something other than true. The fact that the large majority of the earth's population is "lactose intolerant", suggests that lactose intolerance is not even remotely an impediment to fitness in an evolutionary sense.
  18. W

    Are lathe tool carbide inserts supposed to be sharp?

    That makes me sad. Beancounters are the most corrosive force in the universe, and I realize that the smaller Emcos aren't Hardinge Super-Precisions, but it's still disheartening to see a good manufacturer choose to cut corners on quality control.
  19. W

    Are lathe tool carbide inserts supposed to be sharp?

    You did say the lathe was an Emco, yes? I would not have expected it to have particularly poor bearings in the first place.
  20. W

    Chinese 4 stroke model camshaft repair advice

    I must disagree. There is wrong equipment. The wrong equipment is equipment for which you have paid more than the satisfaction or production capability it brings you. That's not necessarily to say cheap, ugly, or even less effective equipment is "wrong equipment". If you have less expensive...
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