On Saturday 14 July 2018 09:13:12 TJoseph Powderly wrote: > I've seen roller racks before but this is circular. > > something says to me "Bridgeport belt replacer" > > other voices says "hmm, weak force transfer" > > but a beautiful disk and interesting programming problem > > TomP > > > https://www.youtube.com/watch?v=-9gQ1KRhesM
Interesting TomP. But I note there was a teeth size vs sprocket size miss-match on the front pinion, so you would feel that cyclic velocity change with your feet. Not slippage as such and probably required in order to make that drive shaft gear ratio changeable. Likely the same effect at the rear, but overall it works because it is sloppy. But what about the lateral flex of that big unsupported at the edges by anything but the wheel spokes rear gear? I'd almost be willing to bet a strong rider could make it hop a few teeth. Or even shatter the ceramic from the shock load. Ceramics can be amazingly strong. We once had a couple ashtrays made from the same ceramic as the space shuttles tiles, since Coors also made those. Advertised in the Coors gift shop in Golden Colorado as unbreakable, and they were throwing one of them down onto a cement floor with considerable force, and they just bounced. So we bought a couple. It was something over a decade later when I broke the first of them on the sidewalk in front of our house in Nebraska, followed about a year later by the 2nd one. So they weren't truly unbreakable, but would have been bent or broken long before that had they been made of the plaster of Paris their color suggested they were made of. Bridgeport spindle drive? An efficient one at that? Maybe. Efficient, way more than a Salisbury clutch with a human, flyball or cnc controlled sheeve disk spacing, they heated the belt and eventually destroy both it and the faces of the sheeves. Had one of those on a tote-goat 55 years ago. 10 mph on flat ground, 5 mph up a pine tree. All with maybe a 1000 rpms diff from one condition to the other. With a puny little 2.5 horse cast iron B&S motor, it dragged a good sized whitetail buck I had busted from 640 yards, back up the top of a shale ridge to as close as we could get the pickup parked without sliding it down the side of the ridge and into the Cheyenne River about 35 miles north of Wall, SD. Burned all the hair off the bottom of him too. Aiming nearly 20 feet above him and about that far into the wind, I'd put two lead pencil sized holes about 2.5" apart all the way thru his liver. Out of the skillet, he tasted of liver from end to end. -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
