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Old 09-14-2020, 12:23 PM  
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Default Mt Washington Cog RR build

Here is a photo and video of this awesome engine.



Because it is so small we decided to do it in G3 at 22.5:1
To use the LGB rack and its holders, I tried these brass bridges that worked but we would need 200 of them so we are looking for alternatives.


Because the elevation varies by 8 degrees, I decided to make the crown sheet as low as possible thus increasing the water capacity


I then roughed out the chassis to determine the clearances and get some cad drawings of the parts to be CNC milled


And started on the cylinders.


This is a point to point RR which will require RC. Because piston valve are required for the cylinder valves , I decided to kitbash some Ruby parts. Using them, I should be able to have only one reversing valve for four cylinders.
The Ruby cylinders and valves need to be cut down to scale length. I picked up a pair of Ruby valves from Acucraft.
The first step is to cut off the steam tubes as I will need to mount it in the four jaw chuck for machining
.

I could mount the valve in the independent four jaw but one jaw would mar the port side and doing four valves a lot of adjusting would me necessary. Instead, I used two 1/8" strips which were reduced by .002 each on the belt sander. and mounted the assembly in the self centering four jaw.
I had to reduce the body of the valve to .850" but I left the valve part the full length to be able to use the Ruby piston.


Since the valve and piston were cut, I lost the front mounting holes. New holes were drilled out on the mill.




The engines are different on the prototypes but I found one that had covers or cylinders with vertical grooves so I made some in my valves with s 1/8" ball end end mill.


So, here is the cylinder for now.
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Old 09-14-2020, 06:15 PM  
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Another one of a kind, I love it. I never tire of watching your genius at work. I'm a little surprised that you didn't go up to 1/20.3.
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Old 09-14-2020, 06:53 PM  
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Thanks
Yea
bigger would have been easier but the 22.5 will give it the correct stance with the 2-1/2" gauge.
It actually works out to 22.6 but who is splitting hairs
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Old 09-14-2020, 08:19 PM  
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Ohhh nice!
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Old 09-14-2020, 10:58 PM  
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Bill, it’s off to a good start. Looking forward to seeing more.

If you really want to get down to it, the railway was built to a gauge of 4’-8”, so 1:22.4 would be correct. Somehow, I don’t think anyone will notice.
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Old 09-14-2020, 11:05 PM  
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Very interesting build, i had a chance to ride on the railway 20 years ago, very fun. The cars rattle like crazy since they are so light weight. At least you only have to build one car.

Steve
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Old 09-15-2020, 10:05 PM  
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I tried to ride that in 1996 but got got lost and ran out of time. I noticed that on the downhill run that there is a lot of water coming out of the drain cocks. Is water used to help with braking when going down?
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Old 09-15-2020, 10:22 PM  
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The cylinders are used for compression on
the way down. Water is admitted to help keep them cool. The friction brakes are only used for stopping.
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Old 09-16-2020, 05:07 AM  
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bille, thank you for a great video. The strain on that loco must be tremendous. LiG
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Old 09-16-2020, 08:53 AM  
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You may have noticed that there is only one eccentric and no reversing mechanism as it coasted all of the way down. Our version will have reverse as weight does not scale down and we need reverse.
Roger's layout will vary between 2 and 10.5 degrees
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