New feed pump for the boat.

[steamer]

I got the pump body done today.   It's a simple part, machined to Ray's specs.   The bore is recommended to be lapped...which is what I did.   I reamed it first, but to improve the finish, I machined a wood lap, machined from a piece of my broom handle... covered it with Simichrome, and had at it, turning the part end for end as I went.   Cleaned up nice.

I then made the oil cup, and the valve box....at which point I stuffed it!...so I'll make a new valve box in the morning....







Dave

[Don1966]

Look good to me Dave, keep it coming.

Don

[steamer]

Thanks Don!....got some honeydo's to do today...but hopefully this afternoon, I can run into the shop for a while.
The new magnifier worked a treat while undercutting the 8-32 screw at the shoulder on the oil cup.   
Additionally, I need to some new boring bars to go with my boring heads...everything I have fits the old head on "Norm"

Dave

[steamer]

Got boring bars!.......

Dave

[Mosey]

I'm speechless in admiration of your rig.
Come to think..everyone needs a boat so they can need a steam engine.
Mosey

[b.lindsey]

That bore looks very smooth Dave!!  Does the simichrome have some mild abrasive properties to it?

Bill

[Don1966]

Dave check you PM.

DON

[steamer]

That bore looks very smooth Dave!!  Does the simichrome have some mild abrasive properties to it?

Bill

Yes...it's like a very fine buffing compound.  Good for fine polishing....though I just wanted to get rid of the worst of the tool marks.

Dave

[ths]

Looking good, Dave. Just wondering how the brass will stand up to the rigours of constant work. I know we all use it for cylinders, but many of our things are rarely, or only lightly, in action. A good summer for you could see a fair bit of wear potential. You must be using o-rings to minimise friction.

Cheers, Hugh.

[steamer]

Hey Hugh,

It uses an O-ring in the piston.   This pump was designed by Ray, and there are many of them in operation in the real world..so I have faith

Here's the state of play.

I finished the valve body tonight....made the second one faster than the first.   That would be the one on the right.



On top is a valve shuttle.   It fits well.    Ray calls for hex plugs to cap the valve body with seal washers.   I co-bored mine for O-ring seals like an SAE fitting.

Here is the  mock up of parts so far....I need to get bolts long enough....but I'm gaining on it.



The valve spools seat and seal nicely!....I need to engineer a hex plugs to limit the valve lift.   The outlet is 1/4 NPT.


Dave

[Don1966]

Nice it of work Dave, works a treat for me.

Don

[steamer]

I'm speechless in admiration of your rig.
Come to think..everyone needs a boat so they can need a steam engine.
Mosey

Thanks Mosey!

Man created boats to keep his engines dry!.....

Dave

[Jim K 324]

                Nice piece of work Dave ,where we live in south Louisiana every body has  a boat in the
                yard jsut in case the water gets too high in the Atchafalaya river. 

                     Jim

[steamer]

Thanks Jim,

This pump will be run at about 1/3 of the engine speed...or about 450/3 or 150 strokes/minute at full song....I intend to repitch the prop to 16x20 from 16x18...so I'm hoping to get the engine speed down to 450 from 550.   Use less steam.

The stroke is selectable from 1.625 to 2.000...IIRC.   The crank disk has 4 holes in it to reposition the crank pin there buy changing the delivery volume.

I'll need about 100 pounds an hour minimum.

At 150 strokes per minute and 80% efficiency, at 2.00 inches per stroke, I'll be delivering about 106 cubic inches per minute.  That's 0.45 gallons/minute or about 27 gallons per hour or about 212 pounds per hour.....More than enough!....If I reduce the stroke to 1.625, I'll get 1.625/2.00 x 212 = 172 pounds per hour.    The excess is will be released via my bypass valve which is shown here on the right with the black knob.

[swilliams]

cool Dave, love your earlier pic of the whole power plant.

Steve