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That's exactly where it comes from! Crowding is increasing the pressure. Like a crowd of people, which is where I think the word comes from somewhere in the history of the English language.I check this thread two or three times a day always knowing there will be some new and wonderful progress made.. Pete
Chris.....won't matter for your build and I remember you mentioning a tar like build up on certain components, but I have wondered if the gearing..... pinion & rack and the straight cut tooth reduction gearing surfaces were run dry without any form of lubrication?Were the smaller diameter straight cut tooth gears softer than the rack or the large gear? and hence easier and less costly to produce & replaceAny form of tar/pitch like lubricant in the teeth would have simply collected gravel dust Superb build and thread as usual.................(square drive pinions & holes)...but then again this is turn of the Century machinery...........Derek
Ah yes, round to square transitions in shafts. When shafts of that nature and period were made they were forged and the ends were upset on the end of the bar and no material was removed. The square and any collar were equal or larger than the bar/shaft. When milling the square on the end was found to be cheaper than forging, the resulting sharp corners created stress risers that hadn't existed before. Hmmmmm. So there were a few failures. Engineering as usual...... That link Simon posted really should be read by anyone interested in power shovel dynamics. It takes a common, simple, problem and shows how to optimize a shovel for particular conditions.And the angular range they work with is within a 5* window... Cool stuff.Pete
WAIT !!!!Are the sides of the square parallel or is it a tapered square???? Not likely as it's harder to do. A straight sided square hole is easy...Pete
Hmmm, recreating that little setup would have been an interesting challenge for the elves, especially treating "to secure the greatest hardness and toughness"