Author Topic: Pacific Vapor Engine from Morrison & Marvin Castings  (Read 176560 times)

Offline Jasonb

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #300 on: September 09, 2014, 11:02:26 AM »
Thats comming along well Dave. Shame that the gear does cover the writing. Do you know if the etching is correct as they sometimes used a bit of artistic licence, but if its all you have to go on then the solid gear would have to be assumed correct.

Have you seen the video of Lester's one on Smokstak? looks and sounds the part.

Offline Mosey

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #301 on: September 09, 2014, 03:08:29 PM »
Dave,
This is a superior piece of work, as usual for you.
When I see your work, I want to run down to my shop, tidy up for a couple of days, send the machines out for repainting, and buy a ton of accessories.
The  setup of the work is outstanding and very instructive, and now I'll stop complaining when it is difficult to hold the work or indicate on the machine.
Please include us in your progress.
Thanks for showing us how it should be done.
Mosey

Offline Dave Otto

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #302 on: September 10, 2014, 01:13:04 AM »
Per, Jason, and Mosey; thanks guys for the great comments and support, I appreciate it.

My original intention was to reproduce the pumping outfit in the advertisement as close as I could; I guess at the expense of covering up Lesterís nice lettering on the base.
Maury and I also had this conversation and I kind of dug my heals in and said this is how I want mine to look. Maury thinking more like you guys didnít want to cover up the lettering on his engine. So he designed and cast a spoked bull gear.

I think I will go ahead with the solid gear at this time knowing that I can always add the spokes later if I choose. But Iím kind of having second thoughts now, thinking a nice set of tapered spokes wouldnít look too bad.
I only have the add to go by and the closest thing I have seen to an original is the picture of the bracket that I posted earlier.

Mosey, you are too kind,

Thanks again guys,
Dave

Offline Mosey

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #303 on: September 10, 2014, 01:22:01 AM »
Sorry, Dave,
I vote for the spokes, also.
Mosey

Offline maury

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #304 on: September 10, 2014, 03:58:27 AM »
OK, I've been holding off on chiming in on this subject because part of me agrees with Dave on making the pump as close as possible to the original. After all, that is what a scale model is. Here is a pic of my artistic license on the bull gear.

maury
"The trouble with socialism is that you eventually run out of other people's money."... Margaret Thatcher

Offline Don1966

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #305 on: September 10, 2014, 04:22:19 AM »
Dam beautiful work Maury and that would differently make it look awesome. I like................... :praise2:


Don

Offline Jasonb

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #306 on: September 10, 2014, 08:04:07 AM »
I suppose one advantage of the solid gear is it would give the option to run different stroke pumps, etc as a new hole could be added to give the correct throw rather than have one casting for each size pump. As its also likely the pumps would get changed after the initial sale it allows for a bit of "Farm Engineering" by the owner to get it to run whatever he wants. Maybe a compromise would be say 4 holes to reduce the material used but still keep it looking like a disc as you see on some of the timing gears such a sthe Monitor.

Nice gear Maury though I suppose it would really have been in iron but that means outsourcing the casting.

J

Offline Rivergypsy

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #307 on: September 10, 2014, 01:26:07 PM »
Personally I'd vote for the gear too. The only downside if you 3D mill the spokes into it is all the hand finishing afterwards (having just spent too many hours fettling a steel pulley for my entablature engine...  :wallbang: )

Offline GWRdriver

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #308 on: September 23, 2014, 02:56:44 PM »
Much more fitting IMHO . . .
Cheers,
Harry

Offline Rivergypsy

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #309 on: November 10, 2014, 12:41:39 PM »
Hi Dave,

How's it going on this one, any more progress on this one yet?  :stickpoke:  :Lol:

Dave

Offline Dave Otto

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #310 on: November 11, 2014, 12:53:43 AM »
Hi Dave

Thanks for checking on me; sadly I haven't had time to work on my engine since before the GEARS show in late September (wow has it been that long!). Don't give up on me, it is getting to be the time of year where one has more shop time. Hopefully some of that shop time will be spent on my projects. I do work for other folks in my home shop as well; pays for the toys.

Dave

Offline Rivergypsy

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #311 on: November 11, 2014, 01:27:10 PM »
Ah that's a shame, Dave, but fingers crossed for some time soon. I know what you mean about the paying work at home, but I decided to give it up some time ago for the same reason - everyone else's projects came on in leaps and bounds whilst mine languished in the corner. It's more expensive, but more fun to play with my own toys.

Keep up the good work though,
Dave

Offline Dave Otto

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #312 on: January 05, 2015, 12:09:56 AM »
Hi everyone

I managed to carve out a little bit of time over the holidays to work on the Pacific. I didnít get very much done but every little bit get me closer to the end.

There are a couple parts (safety devices) that go in the fuel inlet piping between the vapor carburetor and the engine. The first one is the flame arrester; this device has a stack of metal screens inside a housing that in the event of a backfire will quench and extinguish a flame that is moving back up the pipe.

The next piece is a check valve/ relief valve assembly that mounts directly on the vapor carburetor. In the event of a backfire the relief valve opens and vents the excess pressure which keeps it from trying to push back into the carburetor. Also contained in this assembly is a swing check valve that opens when the engine pulls vacuum to let fuel through and then seals when the vacuum is removed.

I started with the flame arrester and then will move onto the check valve assembly.
Below is the patent that I have been working from; you can see both of these parts in the drawing and how they are used.




The flame arrester was modeled in Geomagic; Using the existing piping and hand cocks as a guide I played with the size and shape until I came up with something I was pleased with.


Starting out the insides of both the top and bottom were machined; leaving the bottom half long for something to chuck on to.



The top was screwed onto the bottom and then faced to length.



Here the top section has been machined to length.



The stock wonít fit in a collet so the bottom was held in a 3 jaw chuck and also faced to length.



Both the top and bottom had the hex cut and the 1/16Ē NPT threads put in.



I used the step and cut method to generate the profile of the oval shape. One end was held using a ĹĒ hex collet then when flipped around to profile the other end a round collet was used on one of the steps. This worked out better to maintain concentricity end to end.



After some hand work with files and sand paper here is the final shape.



I still need to punch out the stack of screens to fit inside but that will be done later.



Here it is installed on the engine; Iím pleased with how it looks and complements the other parts on the engine.

Remember a while back I posted some pictures in the Chatterbox section of a couple large Fairbanks Morse carburetors that I had machined from castings? Well these parts were machined from the chucking lugs that were removed from those two carburetor castings.


I have also made a good start on the check valve assembly and will hopefully have an update on it in the near future.
Thanks for checking in.
Dave

Offline ths

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #313 on: January 05, 2015, 03:33:03 AM »
A stunning result with the flame arrestor. How did you calculate the step cutting movements? Hugh.

Offline Don1966

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #314 on: January 05, 2015, 04:00:18 AM »
A stunning result with the flame arrestor. How did you calculate the step cutting movements? Hugh.
I second that Dave and it's nice to see some more progress on this awesome engine.

Do