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Old 01-09-2020, 04:36 PM   #31 (permalink)
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Just the rear screw which will be set with thread-lock
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Old 01-19-2020, 01:19 PM   #32 (permalink)
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I made a ceramic burner box for testing. This will also be used for the rear boiler mounting so it needs to be strong. I start by ripping some 1/16" brass to 1" for the sides. i need to have a bevel on the front to clear the rear drivers so I cut it from the strips before soldering. I solder all four sides together and then cut out the bottom to be soldered on. I use snippets of silver solder and heat from the outside.


I then tilt the box and solder on the transition piece.




Here is some of the techniques I use for the valve gear. I get 1/16" x 1.8" tool steel strips from McMaster. It comes with a black coating which is easily removed with the bench top belt sander.
For the combination levers, I calculate the hole distance needed and then on the mill, I drill the holes in a strip before cutting to length with a hack saw


Stainless rod is used for the pivot pins. I peen the ends over with a small ball peen hamer




I use the edge of the 1" belt sander to form the ends around the holes which is needed for clearance.


Here is how the levers come out


Here they are in place. You can see where the valve rod yoke is contoured on the sander at the combo for clearance. the prototypical reverse arm and link are installed above the expansion link.


The cylinders have covers on the front and back as well as over the valve body. these are made from 3/16" brass bar milled out to 1/8" deep which is the thickness of the valve body cover. I mill the perimeter with a 1/8" end mill and hog out the center with a 1/4" end mill.


I check the fit with a cover and then cut to length and sand to contour.


So the first HP chassis is ready to hook up the steam lines, air test and then paint the cylinders,


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Old 01-19-2020, 02:35 PM   #33 (permalink)
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More great looking jewelry!
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Old 01-27-2020, 12:08 PM   #34 (permalink)
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I didn't show the ceramic burner completed boxes last time. Here are two ready to assemble boxes and one installed in the boiler


The chassis have been tested (both HP & LP) and the first HP chassis is painted.


[
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Old 01-27-2020, 02:48 PM   #35 (permalink)
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Bill, Where do you get your ceramic material from? And beautiful work!

Jason
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Old Yesterday, 03:37 PM   #36 (permalink)
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Jason
Bruce Engineering in UK

Here are some videos I took this morning



This was in compound mode at 25 psi. The front (LP) engine always lags the rear as it is getting its steam from the rear engine. It also runs a little slower as it is using the same volume of compressed air but moving bigger cylinders.

The rear engine has two needle valves attached. The top one will be for the adjustable lubricator and the bottom one is a bleed valve which passes a small amount of high pressure steam to the front cylinder which warms it up prior to start up by cracking the throttle while building up steam pressure.
This is a set-it-and-forget-it valve


Here are the six chassis. The front two are a little advanced in the build.
You can see the linkage between the two chassis which needed to have an idler shaft on the front chassis to go around the boiler mount and still have the long rod going from center to center.



And with the boiler set in place


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Unread Today, 07:46 PM   #37 (permalink)
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That is really some fascinating valving and piping. Looks like it all operates very nicely. I wish my scratch built Mason Bogie would run that well!
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