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Author Topic: side lever engine cira 1840s  (Read 755 times)

tonyH

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Re: side lever engine cira 1840s
« Reply #25 on: October 06, 2018, 10:37:39 PM »

Hi Daves,
Just thinking whether there would be need for weight in the piston to create enough inertia for full rotation, bearing in mind that the originals would have worked with very low pressure and relatively slow rotational speed.

 :-))
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daves

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Re: side lever engine cira 1840s
« Reply #26 on: October 08, 2018, 04:03:40 PM »

As I research and draw the engine and boiler for the steam ship Mississippi I came to the conclusion I will have to research and study the steam engine before I can draw and build one. It stands to reason the more input I have the more information I can collect so I contacted adminstrator on this forum as well as the moderator of another forum asking if I can link this topic on both forums.

 There is no reason to build and maintain two separate topics It makes more sense to link them.

I would like to invite you to take a walk about in a boiler graveyard over at the other site here is the link




https://www.shipsofscale.com/sosforums/index.php?threads/marine-steam-engines-and-boilers.2272/page-2#post-41960
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daves

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Re: side lever engine cira 1840s
« Reply #27 on: October 19, 2018, 04:22:36 PM »

I finished the CAD work for the gothic style frame of the engine and posted more images at this link


https://www.shipsofscale.com/sosforums/index.php?threads/marine-steam-engines-and-boilers.2272/page-3#post-42771


now I am moving on to the CAD work for the condenser but it has me stumped right now as to how it goes together 
I will post my drawings as soon as they are done.
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derekwarner_decoy

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Re: side lever engine cira 1840s
« Reply #28 on: October 19, 2018, 09:44:03 PM »

Dave...I see in the alternate WEB site you ask ......'what is a P Block?'....and the resulting comment of a Pillow Block


I believe an earlier definition or of a P Block terminology was a Plummer Block......further I suggest the bearing housings you have drawn were originally cast as Plummer blocks....and long before someone converted dimensions to the ISO Standard referenced


One of the main differences between the P Bolcks is that the Pillow variety are usually centered around the shaft axis, whereas Plummer had upper and lower elements that had little resemblance with matters of symmetry ...or exactly as the original Drawings depict


Remember these structures featured heavily of Gothic Design   


Derek
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Derek Warner

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daves

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Re: side lever engine cira 1840s
« Reply #29 on: October 20, 2018, 05:03:58 PM »

Dave...I see in the alternate WEB site you ask ......'what is a P Block?'....and the resulting comment of a Pillow Block


I believe an earlier definition or of a P Block terminology was a Plummer Block......further I suggest the bearing housings you have drawn were originally cast as Plummer blocks....and long before someone converted dimensions to the ISO Standard referenced


One of the main differences between the P Bolcks is that the Pillow variety are usually centered around the shaft axis, whereas Plummer had upper and lower elements that had little resemblance with matters of symmetry ...or exactly as the original Drawings depict


Remember these structures featured heavily of Gothic Design   


Derek


on some of the drawings the blocks are referred to as just a P block

the original drawings are difficult to see but here is the original

on the plan the blocks are called pillow blocks but your right there is a big difference  between a pillow block and a plummer block.

I do not know if back in 1840s the term was interchangeable

I did post a few pictures of these type of blocks at this link

https://www.shipsofscale.com/sosforums/index.php?threads/marine-steam-engines-and-boilers.2272/page-3#post-42774

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grendel

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Re: side lever engine cira 1840s
« Reply #30 on: October 20, 2018, 05:27:33 PM »

I am guessing but plummer blocks may have had a white metal or lead insert, which would have formed the bearing surface, and been hand scraped to get the correct seating of the shaft in the bearing - plummer as in lead?
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daves

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Re: side lever engine cira 1840s
« Reply #31 on: October 20, 2018, 05:28:35 PM »

the drawings have 4 different blocks I have to figure out where they go

the first says P block the other one does not say anything

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daves

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Re: side lever engine cira 1840s
« Reply #32 on: October 20, 2018, 05:42:54 PM »

I am guessing but plummer blocks may have had a white metal or lead insert, which would have formed the bearing surface, and been hand scraped to get the correct seating of the shaft in the bearing - plummer as in lead?

from what I photographed in the Ford collection there seems to have been a brass bearing surface but in the second photograph you can see a light colored insert at the top of the shaft

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daves

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Re: side lever engine cira 1840s
« Reply #33 on: October 20, 2018, 05:52:07 PM »

on the two pictures there is a brass insert or bearing surface

this block and shaft is quite different it has this big split ring around the shaft

I wish I would have taken a picture of the back side to see if this ring goes all the way through the block and what stops it from spinning around with the shaft.

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derekwarner_decoy

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Re: side lever engine cira 1840s
« Reply #34 on: October 20, 2018, 11:49:29 PM »

Do not be put off by the irregular octagional shaped bearing element blocks.....these were cast from the RED copper metal family.....down to Muntz Metal or a even softer from the White Metal variety


So,yes......after casting the blocks would have been lathe bored & then hand scraped....again we must remember that these new steam engine machines were to be melded with the accepted Gothic constructional[/size]  architectural design

[/size]Imagine today's costs .....this style of design must have created a very high demand for qualified Journeyman of the Pattern Making and Metal Casting Trades 

[/size]Derek
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