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What an absolutely stunning piece of work this is. The Lombard was also superb and I know that you are a stickler for accuracy. Thus I am very reluctant to point out that the top sheave in your photo of the full size machine has 3 holes - not 4. Hate me if you must!
Chris, Sounds like you are going to have to punish the elves for making a mistake like that! Don’t with hold cookies though, they may go on strike!The boom just gets better and better!Cheers Kerrin
Looks great Chris I dread to think how many nuts and bolts you have needed
not sure of the alloy, the catalogs mention it is a fibrous crystal structure in the iron/steel that allow some give
Quote from: crueby on March 23, 2018, 06:32:48 PMnot sure of the alloy, the catalogs mention it is a fibrous crystal structure in the iron/steel that allow some giveChris, that description sounds like wrought iron which was the common material used for that type of forging in that era.Dan
Looking good
Just watched a couple of videos of steam shovels to see how the dipper boom worked - operator had to be pretty skilled to coordinate the in/out up/down motion of the bucket.Simon.
Quote from: sco on March 24, 2018, 09:03:47 PMJust watched a couple of videos of steam shovels to see how the dipper boom worked - operator had to be pretty skilled to coordinate the in/out up/down motion of the bucket.Simon.On ones of this type there were two operators for digging, one did the hoist and swing of the bucket, the other one (out on the turntable at the base of the main boom) controlled the crowd engine, running the bucket in and out. Must have been quite a skill to have the two guys work as one, the experienced ones worked quite quickly. The one on the turntable also pulled the rope to dump the load from the bucket.In Marion's catalog, they talk about how the up/down, left/right, and in/out motions were controlled by a single lever each on their machines, since the internal valves on the swing and crowd engines controlled BOTH speed and direction with one lever, and the hoist engine had a bypass so pushing the throttle lever back all the way would vent the cylinders, letting them freewheel, and letting the operator lower the bucket without having to move the clutch or brake levers. Very clever stuff - with two levers, the main operator could raise/lower and swing the boom side to side, and with one lever the second operator could run the dipper boom in and out.I had this little animation on an earlier post, here it is again: