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: 405
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

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

Post by djjh87 »

1 week turned into 3 out of the shop but made some progress the last 2 days.
Facing front of cylinders
Recessed a 3/8" plate 1/4"into block for the front truck pin
This will allow room for spacers
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djjh87
Posts: 405
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

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

Post by djjh87 »

More loco jewelry. Thanks Mike
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djjh87
Posts: 405
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

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

Post by djjh87 »

Back on front truck pivot. Drilled and tapped for 3/4 -16
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djjh87
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Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

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

Post by djjh87 »

Turned and threaded. Screwed together and weld . Jim
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djjh87
Posts: 405
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

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

Post by djjh87 »

Oh I mentioned spacers possible earlier but with 3/8 plate I could take off 1/8 maybe 3/16 if needed.
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djjh87
Posts: 405
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

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

Post by djjh87 »

Used a 2 flute 7/16 mill plunged 3/8. Tapped 1/4 NPT.
Drilled passage at 15 degrees. I based all lengths from faced head side.
This has got me thinking about drain cocks and
Greg's stacked cheeseburger snifter valves.
Jim
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Harold_V
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Re: 2 1/2" scale 4-6-0 build

Post by Harold_V »

Hmmm. Out of curiosity, did you use a standard length pipe tap? If so, it's likely that the required fitting won't engage much, if at all. Rule of thumb with a pipe tap is to tap within five threads of the shank end of the tap, which requires a much deeper hole than you provided.

I usually fit the piece I intend to install to ensure that the fit is correct. I do not own pipe thread gauges.

H
Wise people talk because they have something to say. Fools talk because they have to say something.
djjh87
Posts: 405
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

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

Post by djjh87 »

Hi Harold, after mowing late afternoon I popped in the shop and tapped the holes and did not have a chance to test. According to Winton Brown engineering data page 36 1/4 NPT needs 3/8 deep to be tight. If I have to I will grind an old tap (if I don't already have one) and enlarge the threads.
Jim
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NP317
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Re: 2 1/2" scale 4-6-0 build

Post by NP317 »

I have several pipe taps with the end threads ground off to act as Bottoming Taps.
They have worked as anticipated.
RussN
djjh87
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Re: 2 1/2" scale 4-6-0 build

Post by djjh87 »

The front subframe dropped in with no issues. This is all done old school by dials and backlash I have never owned a dro. At times I sure would like one though.
Jim
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djjh87
Posts: 405
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

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

Post by djjh87 »

Machined the shoulder where the top frame clamps the cylinders down. I'm working on a quick and dirty fixture to hold it down to do the critical stuff.
Jim
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djjh87
Posts: 405
Joined: Tue Apr 29, 2008 5:32 pm
Location: florida

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

Post by djjh87 »

It was time to check the fit in the frame and the front truck. Then some encouragement shots.
Jim
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