Building a Power Model Water Pump

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Bill Shields
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Re: Building a Power Model Water Pump

Postby Bill Shields » Tue Feb 19, 2013 1:05 pm

yes - doesn't have to be bronze - brass will work.

this is what I did with a porous casting

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I didn't fool with locite for this, I just heated the casting and froze the sleeve and in it went.

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John_S
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Re: Building a Power Model Water Pump

Postby John_S » Tue Feb 19, 2013 6:00 pm

Fred_V wrote:why cast iron for the sleeve? why not bronze? would it work to Loctite it in?


Cost. You won't see the sleeve so it can be cast iron.

Have you seen how much a 6" long piece of 1.500" brass (or bronze) costs these days?

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Stuie
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Re: Building a Power Model Water Pump

Postby Stuie » Tue Feb 19, 2013 10:11 pm

Just make sure you store the locomotive with the pump dry! My dad spent an entire summer rebuilding his locomotive as a kid because the cast iron piston sleeves had rusted the piston in place. Even though he always blew the locomotive out with compressed air after each run, he made sure that he added extra oil from then on!
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Bill Shields
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Re: Building a Power Model Water Pump

Postby Bill Shields » Wed Feb 20, 2013 7:20 am

exactly why I went with brass - pitting...

it is almost impossible to get these things dry.

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John_S
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Re: Building a Power Model Water Pump

Postby John_S » Wed Feb 20, 2013 6:50 pm

Few more parts finished up.

"Caps" as the print calls them -- basically keepers that fit into the water check passages in the cylinder:
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I've got a piece of bronze material coming to make my steam cylinder sleeve out of. Until then... plenty more parts to make!

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Re: Building a Power Model Water Pump

Postby John_S » Sun Feb 24, 2013 12:32 pm

Got the steam cylinder sleeve just about finished up this morning. The weather is so nice out I'm going to step outside for a bit and enjoy it!

Cast bronze, courtesy of Rich_D
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Setup the cylinder in the 4-jaw and bored out an extra 0.9375"
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Closeup of the steam passage that's the cause of all this extra work
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Turning a mandrel to machine the sleeve on
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Turning the ID of the bronze sleeve to match the mandrel
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Turning the OD of the bronze sleeve with it mounted on the mandrel for a press fit into the cylinder
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Cylinder and sleeve, ready to be pressed together
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Pressing the sleeve in
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Nearly finished. Last step is to put it back in the 4-jaw and bore the ID back out to 1.375" and then face off the extra sleeve material on the top end of the cylinder
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John_S
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Re: Building a Power Model Water Pump

Postby John_S » Mon Feb 25, 2013 8:08 pm

All better!

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Pipescs
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Re: Building a Power Model Water Pump

Postby Pipescs » Wed Dec 18, 2013 10:08 pm

curious as to what happened here.
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John_S
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Re: Building a Power Model Water Pump

Postby John_S » Fri Dec 20, 2013 9:32 am

Pipescs wrote:curious as to what happened here.


Sidetracked with other projects, such as my scratch built hopper car :)

hopper.jpg
Hopper car for coal


The pump is still in progress and I'll be getting back to it soon. The last work I did was to make a mounting plate for the valve chest casting so I can set it up in any orientation and have it be square from any angle.

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John_S
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Re: Building a Power Model Water Pump

Postby John_S » Sun Jan 19, 2014 3:10 pm

Back on this project again... finished fixing my goof on the steam side of the pump from earlier (the hole that drifted). After sleeving the bore I drilled the passage (correctly!) from the opposite end, intersecting the previous hole.

pump1_19_14_01.jpg


pump1_19_14_02.jpg


Then machined the slot that connects the passage to the bottom end of the cylinder.

pump1_19_14_03.jpg


(sorry for the terrible photos -- I cannot locate my flash diffuser for my camera)


Next up I'll finish my fixture to hold the valve casting and start machining it.

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Builder01
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Re: Building a Power Model Water Pump

Postby Builder01 » Mon Jun 12, 2017 7:31 pm

Did you ever get your pump going?

David

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Re: Building a Power Model Water Pump

Postby John_S » Wed Jun 14, 2017 8:56 pm

This darn thing is still sitting on the workbench unfinished. I really, really need to get back on it and get it on the mogul. The English injector I have on the fireman's side right now is pretty much useless and I need to get the pump done.

Married life, career change, and various other things have kept me from having my normal amount of shop time the last couple years. I've also been working on more urgent things than the pump. Perhaps once I finish the current project, replacing the Allen mogul loco brakes with equalized brakes, I'll get back on this.


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