2” Scale Single Cylinder Tangye Build

[fltenwheeler]

I decided to do the governor first. With 88 parts it is a project in itself. I will be using 1144 stress proof steel, 360 brass and 932 also known as SAE 660 bearing bronze for the construction. I will be using American National Standard threads for the fasteners.

The first part is the governor spindle. With a major diameter of 1/4” and just over 1-1/2” long. It required a 1/16” hole all the way through. There will be 1/32”x1/16” bushings installed in each end.

 

[fltenwheeler]

The bushings have been machined and installed with a press fit. 1/32”x1/16”x1/8” and a 1/32”x1/16”x1/4”.

Tim

 

[Lloyd-ss]

For some reason this caught my eye even though I am not familiar with the tangye engine. The 2nd sentence about 88 parts in the governor says a lot. Ouch.!

 

[fltenwheeler]

The model went out of production in the early nineties. It took me awhile to find these castings. I have wanted to build this engine for 40 years.

Tim

 

[fltenwheeler]

The flats have been machined on the spindle. I now have 3 parts done. 85 more to go and then I can start on the engine.

 

[Lloyd-ss]

The model went out of production in the early nineties. It took me awhile to find these castings. I have wanted to build this engine for 40 years.

Tim

A build fueled by passion. I will follow this.
Is this one of the 1800's steam engines from their Birmingham works? I was surprised at how prolific that design was worldwide, with many still in operation. The 2" scale will be substantial.
Lloyd

 

[fltenwheeler]

A build fueled by passion. I will follow this.
Is this one of the 1800's steam engines from their Birmingham works? I was surprised at how prolific that design was worldwide, with many still in operation. The 2" scale will be substantial.
Lloyd

It has a 9” flywheel and is 15” long. It is a beautiful model. To bad the molds have been lost to time.

Tim

 

[fltenwheeler]

The next part I am working on is a collar that will go on the governor spindle. Drill and ream a piece of steel to an ID of 1/8” OD 7/32” and 1/8” long. Drill the collar for a set screw size”N”.

I go to the screw chart and it specifies a 00-90 or a BA12 grub screw. 3/32” long. I can not find any of my 00-90 taps. I found the die but no tap.

Another thing to order.

Tim

 

[fltenwheeler]

My work for Monday. The upper governor flange. 3 threaded 0-80 in a 3/16” grove. It is 5/8” diameter. The spur has a 1-1/2 degree angle machined in. It still has a couple more operations to go. But. I will work on the bottom one first.

 

[fltenwheeler]

The upper a lower governor flanges are almost done. Once the 1/8” lathe mandrel shows up I need to take 0.005” off the upper face of the top Flange. The one on the right.

Tim

 

[fltenwheeler]

I am still making parts for the governor. The next item I will be making are the 3 springs that go between the top and bottom. They are made from 0.002” feeler gauge. I will make a fixture to make them so the hole spacing will be the same between the 3 of them.

Tim

 

[Lloyd-ss]

.002" feeler gauge blade. I am curious to see how this goes together. Trying to envision it in my mind. Will be interesting to see how far off I am, LOL.

 

[fltenwheeler]

.002" feeler gauge blade. I am curious to see how this goes together. Trying to envision it in my mind. Will be interesting to see how far off I am, LOL.

I made a fixture to stamp out the governor springs out of 0.002” feeler gauge. I need to finish deburring them and make a few more for spares. They are held on with 0-80 screws. I also need to make the special washers that go under the screw head. I have to figure out how to make the half ball that go in the center of the spring.

 

[Lloyd-ss]

0-80. hmmm 2-56 is about as small as I go, but I can see the need some day.
So there will be some sort of weights connected to the center holes and the lower hub will rise as the speed increases. I see the concept.
Would a .177 dia BB serve as a starting point for the half ball? They are soft steel.

 

[fltenwheeler]

The bottom is stationary held down by a collar that uses a 00-90 screw to hold it in place. The top moves down and pushes on a 1/32” shaft that is in the middle of the spindle. This operates the valve.

The half balls are 3/8” steel that I will be working on next. I purchased a form tool to speed things up.

Tim

 

[fltenwheeler]

I am working on the half balls. Luckily the DRO has tool offsets that I was able to set for each tool. I made one without taking into account the thickness of the cutoff tool. But after that they are looking good.

Tim

 

[fltenwheeler]

I think it will work. They will be installed with rivets.

Tim

 

[fltenwheeler]

I have all 6 of the half balls cut. 3 of them have these 0.0225" holes for stop wire loops to keep the balls from going too far out.

Tim