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Hi Chris, great adaption of that valve gear, I was unable to even see how it worked until you showed your simplified version. I think that would come in handy for a twin cylinder boat engine, needing only one eccentric per cylinder, a really elegant arrangement. Even if a separate throttle was required. Probably much easier to move with a servo than conventional reversing linkages.I think you are right about needing that condensate drain in the outer section of the steam chest though. It looks like it will fill with condensate, so may jam before there is enough heat to keep it evaporated. Or perhaps the condensate just allows the valve to move back and forth with minimal extra resistance. I am sure I remember you saying locating it is on your list for your visit.The wonderful work is continuing to your usual standard.MJM460By the way, the 1/16 lead screw pitch would go well with the 1/8 pitch on my lathe. So long as the tape is metal, not plastic like dressmakers use!
In your post on November 7 you were discussing the clutch on the hoist drum. I get why they used the steam actuated clutch band, that's kind of ingenious. I can even understand why they had to make that device part of the rotating assembly. There's not a lot of available room there, even though it does add the complexity of rotary couplings for the steam. But I pity the poor schmoe that they sent out to service this thing - working on this thing in 1:1 scale had to be a nightmare.Don
ChrisDon’t knock the woodWhen I start w**k 55 years ago as an apprentice electrical at the local iron work the had lots of electric overhead cranes ( I am 70 now ) those were old then most had wood blocks for brake shoes for the main hoist these were up to about 15 ton lift they worked in very dirty dusty conditions and lasted a couple of years , they were made in the chippies shop on their band saw so were cheap The bigger modern cranes at 750ton lift in the melting plant used the modern friction material Great work you are doing in fusion360 a pleasure to see Stuart
Chriswell there were no Knots in it ,I suspect it was Ashyours asking a lot for my brain cell I can picture them in my mind and a close grained fudge coloured wood come to minddrums were of course Cast Iron and as you can imagine well polished dims 24 in dia 6 inches wide but thats all from memory
From the background reading I have done on steam shovels in the UK it seems brake blocks were made from Elm. But that was before Dutch Elm Disease in the seventies. (I have started a new thread to ask some questions about Ruston-Bucyrus so as not to hijack this thread of Chris's.)Jerry
Lookie what I found. Not a Marion but very similar. Too bad one can't see the 'rear' end but it's blocked by the coal wagon.Pete