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Author Topic: side lever engine cira 1840s  (Read 3717 times)

daves

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Re: side lever engine cira 1840s
« Reply #100 on: February 03, 2019, 12:01:15 AM »


thank you Derek never in 100 years would i have come up with the term "shearlegs"


hum?? interesting indeed shearlegs is the answer to lifting heavy things, now to ponder moving heavy things, the shearlegs are stationary so the parts have to be moved to the shearlegs. Unless the shearlegs rotated then it could be constructed next to the hull, rotate and pick up the frames then rotate them over the hull timbers and set them down.


it does make engineering logic to lay the keel set the floor timbers in place and construct the engine, then built the hull around the engine rather than build the hull first and lift up and lower the engine into the hull.  But somehow the shearleg crane has to swing and pick the parts up off the ground and place them on the hull floors.
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derekwarner_decoy

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Re: side lever engine cira 1840s
« Reply #101 on: February 03, 2019, 04:12:52 AM »

Dave........the following image & text [Belfast Ireland] answers some of your questions


I had the advantage & privilege in part of my working life, as being employed by our Australian Department of Defence Navy, located at our Fleet Base, Garden Island Sydney


In the history of GI, we see she still had a large 'pair of shear legs' as late as 1927.....


Derek ....[it was said that Above Weapons Foreman don't actually work  {-) ] :P
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Derek Warner

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daves

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Re: side lever engine cira 1840s
« Reply #102 on: February 05, 2019, 03:29:33 PM »


check out this crane in the foundry where they are casting the cylinder pretty nice


I am still searching for better drawings of how shipyard cranes shearlegs and derricks work they had to swing side to side to pick stuff up off the ground and swing it in place.



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daves

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Re: side lever engine cira 1840s
« Reply #103 on: February 07, 2019, 02:54:59 PM »


I would think a crane of some sort had to swing to the side pick up a part and swing it over the hull. This system would need a slewing platform of some sort.


any ideas?
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derekwarner_decoy

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Re: side lever engine cira 1840s
« Reply #104 on: February 07, 2019, 10:40:43 PM »


Dave......the motions of Sheer Legs were limited to lifting, luffing & lowering.....due to the design limitations [of stability] larger variations were fixed and did not slew


Reading of references has noted that to attain a placement of a load, it could be necessary to move the vessel in a longitudinal plane [fwd to aft] under the Sheer Leg centre or axis to gain a tru[ish] vertical lift or lowering


https://www.youtube.com/watch?v=pDUvN2C8Wa4

The huge Sheer Leg set at Garden Island were not for ship construction, but ship maintenance...so it was  a relatively simple method of moving the ship along the wharf to gain that tru[ish] vertical lift

[and all this time I had been incorrectly thinking >>:-( of two items in [shear]
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Derek Warner

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daves

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Re: side lever engine cira 1840s
« Reply #105 on: February 08, 2019, 12:56:42 AM »


I found these



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daves

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Re: side lever engine cira 1840s
« Reply #106 on: February 08, 2019, 02:41:52 PM »



I actually found this it is from the very company that built the engine being modeled here


it shows 3 different cranes in use

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daves

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Re: side lever engine cira 1840s
« Reply #107 on: February 08, 2019, 02:53:41 PM »


after watching the shear leg video I can see how it would work lifting heavy engine parts and placing them in the hull.


here is another type crane that seemed to be everywhere
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