Railroad Warehouse 2.8.2 Mikado Logger Build

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Bill Shields
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Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Bill Shields »

Sometimes to make people stop and think about that they are reading.
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Odyknuck
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Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Odyknuck »

And here I thought it was just me lol
Odyknuck
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Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Odyknuck »

Today I finished up the radiuses on the bottoms of the Sand and Steam Domes. All can say is what PITA. Fly cutting these took a long time as I could only take .020" cuts on them due to the intermittent contact points. The Steam Dome diameter was larger than my mill's quill feed stroke, so I had to rotate it 180 degrees to finish it. There is no real good way to hold these for machining. These have a lot of porosity and are going to need some body work. Waiting on the center material to complete them. I am curious what you guys have done to get these completed.
Attachments
bdomebot.jpg
bdomecut.jpg
bdomein lathe.jpg
bdomefly.jpg
Last edited by Odyknuck on Tue Nov 08, 2022 10:34 pm, edited 1 time in total.
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Bill Shields
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Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Bill Shields »

I did it in a 15" swing lathe...but understand your pain

Or there is the old standby of a shaper :mrgreen:

Your solution is elegant
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Odyknuck
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Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Odyknuck »

Don't have a shaper. Curious how you did the radiuses in a lathe?
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Bill Shields
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Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Bill Shields »

one of those made by a blacksmith fixtures.

fits very nicely on a 14" diameter face plate for an 8" diameter smokebox / boiler

nothing fancy (really ugly), but very solid and works - and will never be needed again (my one and only 7-1/4" loco)
turning stack flange.jpg
there are times when a clunky old 16" SB is very handy to have
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NP317
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Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by NP317 »

Odyknuck:
Yea, that milling setup looks familiar. Patience and time are required, unless you have a 3-axis CNC mill ! I don't...
I also turned the dome base and top outside surfaces on the lathe to clean up the porosity. Used the same setup you had.
Sculpting, for sure.

Welcome to the world of doing seemingly impossible machining with what we have in our shops.
Beats a hacksaw and files. And many hobbyists have performed remarkable work using those!
RussN
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Bill Shields
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Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Bill Shields »

I hid my first saddle with plotted XYZ coordinates and a ball bill.

Finished with files...
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Odyknuck
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Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Odyknuck »

I could have done these in a CNC Mill at my buddies shop however he is already drawing up my main Rods and valve linkages in solid works and I'm going to let him lol. Then we will machine them. He does not like the one that came with the loco, so we are making a matching pair with some enhancements like replacing the front bushing oil slot with a grease fitting. We were going to make them one piece however decided to do it in two as the plans show.
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Bill Shields
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Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Bill Shields »

Front bushing? On the crosshead / main road?

Suggest you consider nylatron or delrin AF and forego any need for lube.
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Odyknuck
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Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Odyknuck »

Yes, the crosshead main rod. I have used Delrin in my offroad cars "A" arm bushings. They tend to last a lot longer than the other plastics however tend to squeak a lot, so I still install grease fittings to make them quiet and last longer.
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Harold_V
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Re: Railroad Warehouse 2.8.2 Mikado Logger Build

Post by Harold_V »

Odyknuck wrote: Tue Nov 08, 2022 11:21 pm I have used Delrin in my offroad cars "A" arm bushings. They tend to last a lot longer than the other plastics however tend to squeak a lot, so I still install grease fittings to make them quiet and last longer.
You said you've used Delrin. Are you speaking of Delrin AF, or just plain old Delrin? They're not the same thing, if you don't know.

Delrin AF is Teflon filled and makes a wonderful bushing. It shouldn't need lubrication, and it may not be desirable (it may encourage the accumulation of abrasive particles).

Just sayin"

H
Wise people talk because they have something to say. Fools talk because they have to say something.
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