Chapter 14.11 – Steam Deflector and Exhaust DeflectorThese last parts are really part of the Tee. The first is the Steam Deflector, which splits the steam into the two passageways, one to the left, and one to the right, while mixing in some oil to lubricate the cylinders. The second is the Exhaust Deflector, which takes the exhaust from the two cylinders and curves it up toward the chimney.
Starting with the Steam Deflector; this was made from a length of 0.5” x 0.75” brass bar. I started by centering it up in the 4-jaw then drilling a tinny (#56 I think) hole 0.75” deep – this needs to go all the way through the deflector. This little hole will be for delivering the oil.
Then I quickly drilled a slightly larger hole to about 1/16”, again, for use with the compression connection to the oil input.
Now we start making the deflector take shape. The first 1/4" will be threaded 5/16” for the oil connection.
Then, using a flat-tipped parting tool, I brought a 3/8” length to 5/16” diameter.
Next, I cut the 5/16-24 threads. I was supposed to have done this before the last step, but at least I remembered to do it before I the part off!
After cutting it off, I moved to the mill where I found the center with a gauge pin, then drilled and countersunk the mounting holes.
Flipping the part over, I used a 45
o chamfer tool to bring the business end of the steam deflector to a peak. This is where the steam, coming in from above, will be split left and right, and mix with the oil.
Oh! And one last thing I almost forgot – I need to thin the 1/2" width down to 15/32”, so I shaved 1/64” off both sides. This operation completes the steam deflector.
Now, for the Exhaust Deflector. This one is 25/32” long which means I couldn’t make it out of the same 0.5” x 0.75” bar. So I switched to a 0.875” diameter brass rod for this one. The exhaust deflector is simpler (no oil connection). I made the basic shape then cut off the part.
Next, I cut the width of the base down to 15/32”.
To find the center on the mill, I used a coaxial center finder (fun little tool!)
Then drilled the mounting holes:
To help redirect the exhaust upward Kozo uses a curve surface here. I used a 3/8” ball end mill to get the curve shape:
And finally, flipping it over, I countersunk for the mounting screw heads.
And here are the two completed deflectors; the one on the left is the exhaust and on the right is the steam (with the extra oil connection).
And finally, I mounted the deflectors in the steam Tee. If you recall, there were two holes that went through to the bottom of the Tee. Here’s where the deflectors will be inserted. The hole on the left is the steam delivery, the one on the right is the exhaust.
Here they are after mounting. Not quite as interesting of a picture, but hopefully they'll be more functional inserted in the right place!
That completes the cylinder assembly. Next up will be the pistons and crossheads. Unfortunately, there’ll be a break in our regularly scheduled build as I will be taking some days (weeks? months?
) to clean up the garage. Not just my shop, but the other half where all the excess house stuff gets stored. While that will take some time, it will be good to get it cleaned up!
Thanks for stopping by,
Kim