2 1/2" scale 4-6-0 build

Where users can chronicle their builds. Start one thread and continue to add on to it.

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djjh87
Posts: 237
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

Re: 2 1/2" scale 4-6-0 build

Post by djjh87 » Thu Nov 17, 2022 5:32 pm

This material is some kind of stainless the was found on one of many dumpster dives at my employment probably 25 years ago. It turned nice. 2.5 down to 1.5 for brake pistons.
Jim
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Odyknuck
Posts: 147
Joined: Mon Aug 08, 2022 4:21 pm

Re: 2 1/2" scale 4-6-0 build

Post by Odyknuck » Thu Nov 17, 2022 6:19 pm

Gotta love having scrap steel laying around as it comes in handy.

djjh87
Posts: 237
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

Re: 2 1/2" scale 4-6-0 build

Post by djjh87 » Fri Nov 18, 2022 7:27 pm

Found time to machine the brake pistons this morning. Jim
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djjh87
Posts: 237
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

Re: 2 1/2" scale 4-6-0 build

Post by djjh87 » Sat Nov 19, 2022 4:57 pm

Piston pressed on rod. Waiting on springs.
Turned two centers crossed drilled 1 reamed the other tapped
Cut a brass slung to go between the rod and set screw
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Odyknuck
Posts: 147
Joined: Mon Aug 08, 2022 4:21 pm

Re: 2 1/2" scale 4-6-0 build

Post by Odyknuck » Sun Nov 20, 2022 10:17 am

What's the device in the bottom pic used for?

djjh87
Posts: 237
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

Re: 2 1/2" scale 4-6-0 build

Post by djjh87 » Sun Nov 20, 2022 9:13 pm

Trammel for the center to center of axles for laying out side rods. Jim
Attachments
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Odyknuck
Posts: 147
Joined: Mon Aug 08, 2022 4:21 pm

Re: 2 1/2" scale 4-6-0 build

Post by Odyknuck » Sun Nov 20, 2022 9:36 pm

Ah, ok. Nice job on the brake pistons.

djjh87
Posts: 237
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

Re: 2 1/2" scale 4-6-0 build

Post by djjh87 » Tue Nov 22, 2022 6:11 am

Well these brake cylinders have been full of learning opportunities. First had to move them forward and while trying to install o ring on piston and into the cylinder it was to tight for my liking. I used the print dimensions which fell in line with standard charts but was to tight. After digging I found some great info in Winton Brown engineering info and online found Model Engineers handbook .
Rechucked the cylinders and placed a 15 degree bevel on both ends. Then the piston rod with piston in a collet to deepen the o ring grove to reduce the squeeze. You can teach old dogs new tricks. Jim
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djjh87
Posts: 237
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

Re: 2 1/2" scale 4-6-0 build

Post by djjh87 » Wed Nov 23, 2022 5:03 am

Ordered pins when I ordered springs for the brake cylinders. Hope to finish up the breaks today. Jim
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djjh87
Posts: 237
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

Re: 2 1/2" scale 4-6-0 build

Post by djjh87 » Wed Nov 23, 2022 7:55 pm

A lot of fiddle work but the brakes are complete. Not yet. The center bent rods are touching the eccentric straps on the low oscillation.
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