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Sorry, but no. Take the larger circle, split it in the bottom center and turn the two tails out so that it's shaped like an Omega symbol. Roll your smaller circle along the Omega-shaped path. This will have almost exactly the same "larger circumference that the smaller circle has from its...

It's not really "that one needs to rotate twice to achieve the same as both rotating once". The reason there's 1 additional rotation, is because the one that's moving is _rolling_around_a_circle_. If you linearize the circumference of the bottom circle, you get exactly the ratio of...

I expect that is 20G inline with the opening direction of the reeds. Shock loads transverse to the opening direction probably can be significantly higher - at least in terms of sporadic opening. Whether the reed can survive significantly higher shock loads without breaking is a different...

I should say, nothing in what I've been arguing should be construed as a good reason to use a reed instead of a Hall or optical sensor in an ignition system. I only brought it up because my initial gut reaction was the same as Bluejets - no way a dinky little reed can do that! - but thinking...

Maybe I'm just being dense, but -- how is the normal-system points-open time relevant? The math says at 1000 RPM (single cylinder) you've got about 60ms before the points need to open again, so there's more than enough time for them to close 3ms later, rather than 10 degrees later.

There are not 6,000 milliseconds in a minute... There are 60,000. I don't know what Bluejets' concern is about the timing. 3ms is enough for over 300 open/close cycles per second. And the reed spring is under far less stress than points springs or the valve springs, so I'm not seeing the...

I've got to say, my initial gut reaction was the same, but... if it's a low-current signal? Points handle vastly more current, and generally in a much more hostile environment than the inside of a reed switch glass envelope, and they seem to have worked well enough to get us down the road...

I am somewhere between amused and saddened by the number of posters here who think they have a clue about the economics of machinery repair in China, especially more rural China. And how does the fact that the wire is expensive, negate the fact that in an economy where such motors are not...

What, exactly, does this even mean?

The use of R instead of a specific center is why it went "almost straight across". R leaves the actual center ambiguous, and your interpreter chose the wrong one. It went on an R 0.470 curve around the center that's closer to the midpoint between 4 and 1. By the way - I used Deskproto for a...

I believe this is much more of a problem if one uses a cutter with more than 2 flutes. 2-flute end-mills are sometimes (it seems more frequently, on the European side of the pond?) known as "slot drills", because they cut slots more accurately to size than cutters with more flutes. (I'm not...

A particularly useful piece of free software (if you can get past its interface quirks) for fiddling with 3D files, is a program called MeshLab: www.meshlab.net MeshLab has a wide variety of useful tools for modifying 3D (almost exclusively mesh-defined) files, from utilitarian things like...

VRML does have primitives other than planes, but as a format that's been effectively dead for nigh on 20 years, I don't think anyone bothers to even attempt to support the solid geometric primitives anymore. They were never entirely consistent even when VRML was ruled by SGI and Cosmo. VRML's...

If I understand the error (in degrees) you stated a few messages back, the error is in the measurement of the width of the pulse, not in the the motion per msec. A 10% Error in the measurement of the width of the pulse, unless I'm completely misthinking, will produce a linearly proportional...

Your command of English is, I'm quite certain, infinitely better than my non-existent grasp of your language! The problem at least as much that the other English speakers here aren't being precise in what they're saying... Ok, you have the inside cover, and unless there's something /very/...

(regarding the back cover) Since I believe there is a language barrier getting in our way here, I think we need extra clarity on the parts that are being discussed. You have removed the backing plate with the spindle mount. There should also be an internal cover that goes over the scroll and...

Not even close. MS owns the lions' share of the desktop market, but it's getting to the point where pretty much every other electronic device on the planet runs Linux under the hood. TVs, phones, your WIFI router -- chances are if your coffee maker has more than an on-and-off switch, it's...

I remain surprised that works. Of course, the processor is much faster than the mechanical bits, but even at 0.001 degree jitter (which astonishes me that you can get it that small - I'd have expected just simple slop in the crank bearings to contribute more variability than that!), that's...

The private joke there, was that we're also headed towards trying to appropriately instrument and automate our chicken coop, so an Arduino with appropriate chicken-specific functionality would be pretty cool from my point of view. I've thought about trying to RFID them so that the coop can keep...

I'm curious -- how wide (crank degrees) is your pulse? I would have thought that you'd need a pulse that subtends quite a large fraction of one rotation to push the inevitable vibration-induced jitter down into the single-degrees-of-rotation range?