wrkempson

I have TC for PC v19 and have been using TC since v8 (actually v4, but it's a long story).  
 
The trace tool in TC is not good enough for our kind of work.  Under the best of circumstances it leaves one frustrated with its poor quality.
 
I now have a 64 bit version of TC that no longer has a trace tool.  When using Trace in earlier 32 bit versions I quickly gave up on its utility.
 
You might want to check out http://forums.turbocad.com/index.php?topic=11696.0
and http://forums.turbocad.com/index.php?topic=12575.0 for insight from the TC forum.
 
For our kind of work importing the image and then manually "tracing" is better anyway.
 
Wayne

I have TC for PC v19 and have been using TC since v8 (actually v4, but it's a long story).  
 
The trace tool in TC is not good enough for our kind of work.  Under the best of circumstances it leaves one frustrated with its poor quality.
 
I now have a 64 bit version of TC that no longer has a trace tool.  When using Trace in earlier 32 bit versions I quickly gave up on its utility.
 
You might want to check out http://forums.turbocad.com/index.php?topic=11696.0
and http://forums.turbocad.com/index.php?topic=12575.0 for insight from the TC forum.
 
For our kind of work importing the image and then manually "tracing" is better anyway.
 
Wayne

The engine is made up of a few major parts.
 

 
The first part that I modeled was the air pump.  The air pump was connected to the condenser and was used to draw off the condensed water and steam vapor.  This was fairly simple to model as a cylinder with a piston rod.  The air pump was operated by the two slimmer connecting rods coming down from the walking beam at the beams quarter point.
 

 
Next I started on the main engine which is comprised of the condenser, cylinder for the main piston rod and the live steam and exhaust steam pipes. 
 


 
Next I modeled the valve lifters for the live steam and exhaust steam.
 

 
The valve actuating mechanism consisted of a set of large, curved cams called “wipers” which worked against followers called “toes” which were affixed to vertical rods going to the steam and exhaust valves at the upper and lower ends of the two cylindrical vertical steam pipes. The drawing of the engine did not clearly show how these cams were laid out but I did find a good reference.   It was on goggle books called “Marine Boilers; Marine Engines; Western River Steamboats”
 
https://books.google.com/books?id=4Q9WAAAAMAAJ&dq=marine_boilers_marine_engines_western_ri.pdf&pg=RA1-PA73#v=onepage&q&f=false
 
Even with this diagram I still ran into a little interference with the cams. It’s not clearly shown in the diagrams but I believe the outer cams must have had and offset to operate correctly.
 


 
Completed valve actuating mechanism.  The lower smaller cams with the starting bar was used by the engineer when first starting the engine either forward or in reverse.  The rock shafts were two separate shafts supported in the center by a common bushing.
 

 
The pressure gauges and clock layout was plagiarized from the Ticonderoga.
 


 
Engine, air pump with eccentrics
 

 
Engine in place

 
 
 

I like your observation that the block and tackle would support the arm when pressure was below the relief setting.
 
Could the block and tackle also raise and then secure the valve in an open position so as to blow off steam quickly?  Perhaps in an emergency situation or if the boiler was being shut down?  Is the outside ball smaller (lighter) than the inside ball?  Perhaps this is the manner of making a fine adjustment to the valve, especially if the arm were calibrated on the opposite side.  
 
Again, great work on the 3D modeling.  Rope can be something of a bear to make until you get the hang of it (no pun). 
 
Wayne

Beautiful. You have modeled everything except the grease. Well done!
 
Wayne

Beautiful. You have modeled everything except the grease. Well done!
 
Wayne

Beautiful. You have modeled everything except the grease. Well done!
 
Wayne

Beautiful. You have modeled everything except the grease. Well done!
 
Wayne

Beautiful. You have modeled everything except the grease. Well done!
 
Wayne

I had a hard time knowing what I was looking at on the drawing of the beam.  This link has a clearer drawing from an engineering book of 1891.
 
https://books.google.com/books?id=LuIOAAAAYAAJ&pg=PA350&dq=walking+beam+steam+engines&hl=en&sa=X&ved=0ahUKEwiO1ZGxxb_PAhWBOT4KHaQAA7YQ6AEIIzAB#v=onepage&q=walking%20beam%20steam%20engines&f=false
 
Scroll down to see your style of beam. 
 
This beam is of a truss design and is made in two pieces, the inner skeleton frame which is cast in one piece and the outer strap which is forged in one piece.  At either end of the strap are the "journals" for receiving the piston and driving rods.  The "journal" for the air pump is cast into the skeleton.  The strap is held to the frame by "gudgeons."  
 
The illustration in the link above shows the skeleton is thicker in the center.
 
I'm sure this is known to you, but it was a pleasant time for me to track this down, so I thought I would share it with others like me for whom this project is presenting an entirely new field of knowledge.
 
Wayne

I had a hard time knowing what I was looking at on the drawing of the beam.  This link has a clearer drawing from an engineering book of 1891.
 
https://books.google.com/books?id=LuIOAAAAYAAJ&pg=PA350&dq=walking+beam+steam+engines&hl=en&sa=X&ved=0ahUKEwiO1ZGxxb_PAhWBOT4KHaQAA7YQ6AEIIzAB#v=onepage&q=walking%20beam%20steam%20engines&f=false
 
Scroll down to see your style of beam. 
 
This beam is of a truss design and is made in two pieces, the inner skeleton frame which is cast in one piece and the outer strap which is forged in one piece.  At either end of the strap are the "journals" for receiving the piston and driving rods.  The "journal" for the air pump is cast into the skeleton.  The strap is held to the frame by "gudgeons."  
 
The illustration in the link above shows the skeleton is thicker in the center.
 
I'm sure this is known to you, but it was a pleasant time for me to track this down, so I thought I would share it with others like me for whom this project is presenting an entirely new field of knowledge.
 
Wayne

I had a hard time knowing what I was looking at on the drawing of the beam.  This link has a clearer drawing from an engineering book of 1891.
 
https://books.google.com/books?id=LuIOAAAAYAAJ&pg=PA350&dq=walking+beam+steam+engines&hl=en&sa=X&ved=0ahUKEwiO1ZGxxb_PAhWBOT4KHaQAA7YQ6AEIIzAB#v=onepage&q=walking%20beam%20steam%20engines&f=false
 
Scroll down to see your style of beam. 
 
This beam is of a truss design and is made in two pieces, the inner skeleton frame which is cast in one piece and the outer strap which is forged in one piece.  At either end of the strap are the "journals" for receiving the piston and driving rods.  The "journal" for the air pump is cast into the skeleton.  The strap is held to the frame by "gudgeons."  
 
The illustration in the link above shows the skeleton is thicker in the center.
 
I'm sure this is known to you, but it was a pleasant time for me to track this down, so I thought I would share it with others like me for whom this project is presenting an entirely new field of knowledge.
 
Wayne

I had a hard time knowing what I was looking at on the drawing of the beam.  This link has a clearer drawing from an engineering book of 1891.
 
https://books.google.com/books?id=LuIOAAAAYAAJ&pg=PA350&dq=walking+beam+steam+engines&hl=en&sa=X&ved=0ahUKEwiO1ZGxxb_PAhWBOT4KHaQAA7YQ6AEIIzAB#v=onepage&q=walking%20beam%20steam%20engines&f=false
 
Scroll down to see your style of beam. 
 
This beam is of a truss design and is made in two pieces, the inner skeleton frame which is cast in one piece and the outer strap which is forged in one piece.  At either end of the strap are the "journals" for receiving the piston and driving rods.  The "journal" for the air pump is cast into the skeleton.  The strap is held to the frame by "gudgeons."  
 
The illustration in the link above shows the skeleton is thicker in the center.
 
I'm sure this is known to you, but it was a pleasant time for me to track this down, so I thought I would share it with others like me for whom this project is presenting an entirely new field of knowledge.
 
Wayne

I started working on the walking beam engine by first modeling the walking beam.  The dimensions were taken by scaling the drawing.
 

 
Building the model laying flat
 

 
 

 
Nice thing about 3D models is that you can build parts in any order and put them in place.
 

 
 
Next I modeled the support frame for the beam based on the drawing dimensions.
 
Bearings at the top of the frame that supports the beam.
 

 
The main vertical members are 12”x12” timber.  For the bracing tie rods I used 1 ½” diameter rods.
 

 

 
beam in frame, still need to add the main support shaft.
 

 
 
As a side note I made a little virtual walkthrough around the relief valve that I posted but you couldn't play it, so I deleted it.  I guess you can’t post videos here.

I like your observation that the block and tackle would support the arm when pressure was below the relief setting.
 
Could the block and tackle also raise and then secure the valve in an open position so as to blow off steam quickly?  Perhaps in an emergency situation or if the boiler was being shut down?  Is the outside ball smaller (lighter) than the inside ball?  Perhaps this is the manner of making a fine adjustment to the valve, especially if the arm were calibrated on the opposite side.  
 
Again, great work on the 3D modeling.  Rope can be something of a bear to make until you get the hang of it (no pun). 
 
Wayne

I like your observation that the block and tackle would support the arm when pressure was below the relief setting.
 
Could the block and tackle also raise and then secure the valve in an open position so as to blow off steam quickly?  Perhaps in an emergency situation or if the boiler was being shut down?  Is the outside ball smaller (lighter) than the inside ball?  Perhaps this is the manner of making a fine adjustment to the valve, especially if the arm were calibrated on the opposite side.  
 
Again, great work on the 3D modeling.  Rope can be something of a bear to make until you get the hang of it (no pun). 
 
Wayne

I like your observation that the block and tackle would support the arm when pressure was below the relief setting.
 
Could the block and tackle also raise and then secure the valve in an open position so as to blow off steam quickly?  Perhaps in an emergency situation or if the boiler was being shut down?  Is the outside ball smaller (lighter) than the inside ball?  Perhaps this is the manner of making a fine adjustment to the valve, especially if the arm were calibrated on the opposite side.  
 
Again, great work on the 3D modeling.  Rope can be something of a bear to make until you get the hang of it (no pun). 
 
Wayne

I like your observation that the block and tackle would support the arm when pressure was below the relief setting.
 
Could the block and tackle also raise and then secure the valve in an open position so as to blow off steam quickly?  Perhaps in an emergency situation or if the boiler was being shut down?  Is the outside ball smaller (lighter) than the inside ball?  Perhaps this is the manner of making a fine adjustment to the valve, especially if the arm were calibrated on the opposite side.  
 
Again, great work on the 3D modeling.  Rope can be something of a bear to make until you get the hang of it (no pun). 
 
Wayne

The next part I worked on was what I think is some sort of pressure relief valve in the main steam line from the boiler to the engine.  From the drawings it appears to be a weighted lever with a plunger type valve that if too much pressure builds up would be forced up allowing the steam to be bypassed to a blow off stack.   I’m not too sure what the purpose the block and tackle at the end would serve other than setting how far the plunger would need to rise before the steam was bypassed.
 
Original  drawing layout
 

 
 
Modeled relief valve
 

 
 
Weighted lever.
 

 
 
Block & Tackle  The rope in the blocks are just two separate lines, I haven't tried making realist looking rope reeved through the blocks yet (well, actually I tried but the results weren't pretty).
 

 
 
Valve in place off of stack
 

I have little knowledge of this subject, but would the boiler also have two or three relief valves?
 
This is inspiring work of a superior quality.  Thanks for letting us peer over your digital shoulder.
 
Wayne

I have little knowledge of this subject, but would the boiler also have two or three relief valves?
 
This is inspiring work of a superior quality.  Thanks for letting us peer over your digital shoulder.
 
Wayne

I have little knowledge of this subject, but would the boiler also have two or three relief valves?
 
This is inspiring work of a superior quality.  Thanks for letting us peer over your digital shoulder.
 
Wayne

I have little knowledge of this subject, but would the boiler also have two or three relief valves?
 
This is inspiring work of a superior quality.  Thanks for letting us peer over your digital shoulder.
 
Wayne

I couldn’t find too much information on what the boiler would look like so I took some artist liberties.  From the drawings I knew its diameter and length, stack location and the stack height and diameter.  I wasn’t sure about the number or location of the doors used to load the coal so I guessed at two.
 


 
 
I also took some liberties and added a pressure gauge and sight glass.  I always made fun of the designers at work when they added nuts and bolts to pieces of equipment that would never be seen when you printed out the drawing but now I know why they did it, it's fun.
 


 
 
Boiler fit on the plans
 

 
Boiler in the ship
 

Through a hint by a german forums mate I found the following


The 3 arms atop are operated by wires with a chain in the area of the pinion shaft. The arm on the bottom possibly is manipulated by hand and only indicates the orientation of the device.
Question: How are the three arms operated? By a sliding pinion shaft? It looks like the 3 chains are on the same axis.
Both bigger pictures come apparently from HMS Campertown, so the nation and timeframe would fit.
HMS Campertown 1885 Wikipedia
XXXDAn