Bottle Engine 3D Model
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SteamGuy
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Re: Bottle Engine 3D Model
Final rod
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Pat J
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Re: Bottle Engine 3D Model
Flywheel
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Pat J
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SteamGuy
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Re: Bottle Engine 3D Model
And a quick mock-up to get a visual of how a twin could look.
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Pat J
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SteamGuy
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Re: Bottle Engine 3D Model
Still much left to do on this engine, expecially the frame.
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Pat J
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SteamGuy
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Re: Bottle Engine 3D Model
And an early 2D drawing of a twin marine to use the same cylinder and 3" bore.
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Pat J
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SteamGuy
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Re: Bottle Engine 3D Model
And the boat that I dream of building some day.
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Pat J
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Re: Bottle Engine 3D Model
I would build the engine more like a marine version of this engine, without the ugly flywheel.
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Pat J
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Re: Bottle Engine 3D Model
Thats about all the boat-type stuff I got.
Oh, I forgot, maybe a porcpine boiler like this, or a water tube type with three drums as shown in the engraving.
Oh, I forgot, maybe a porcpine boiler like this, or a water tube type with three drums as shown in the engraving.
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Pat J
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Mike Rometer
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Re: Bottle Engine 3D Model
Hi PatJ,
How have you got on machining the steam ports in the valve chest? Getting a long enough cutter, to get that deep without flexing, must have been a problem. It's usually easier to have a removable valve chest.
How have you got on machining the steam ports in the valve chest? Getting a long enough cutter, to get that deep without flexing, must have been a problem. It's usually easier to have a removable valve chest.
Retirement is about doing what floats your boat!
A BODGE : - A Bit Of Damn Good Engineering.
A BODGE : - A Bit Of Damn Good Engineering.
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SteamGuy
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Re: Bottle Engine 3D Model
Mike-
I have tried to adhere to the original construction/assembly techniques of the 1800's in all respects, so having a separate steam chest is out of the question.
So then that leaves the task of figuring out how to mill the ports in the valve seat.
I would plan on the cores for the ports protruding through the valve seat, and would use undersized port cores in order to make a hole slightly smaller than the ports.
Then I would mill to final size using light cuts.
The valve seat is not too far down in the steam chest, and so one of the larger bits should easily mill that.
The good part about the valve seat is that it will wear in, so I am not too worried about a super precision valve/valve seat interface, and I can scrape the valve seat if necessary.
For ports this large, and with a cast-in port opening, and using gray cast iron, I am pretty sure I can mill the ports with a long bit and light cuts, but if I just can't get the reach, then I would scribe lines and use a dremel to final size the ports.
Before I got into castings, I use to try and mill 0.125" ports through solid brass plate, and that always resulted in bit failures. Brass seems to be very bad about snagging a bit, so I try to avoid it, and use gray cast iron when I can.
I have tried to adhere to the original construction/assembly techniques of the 1800's in all respects, so having a separate steam chest is out of the question.
So then that leaves the task of figuring out how to mill the ports in the valve seat.
I would plan on the cores for the ports protruding through the valve seat, and would use undersized port cores in order to make a hole slightly smaller than the ports.
Then I would mill to final size using light cuts.
The valve seat is not too far down in the steam chest, and so one of the larger bits should easily mill that.
The good part about the valve seat is that it will wear in, so I am not too worried about a super precision valve/valve seat interface, and I can scrape the valve seat if necessary.
For ports this large, and with a cast-in port opening, and using gray cast iron, I am pretty sure I can mill the ports with a long bit and light cuts, but if I just can't get the reach, then I would scribe lines and use a dremel to final size the ports.
Before I got into castings, I use to try and mill 0.125" ports through solid brass plate, and that always resulted in bit failures. Brass seems to be very bad about snagging a bit, so I try to avoid it, and use gray cast iron when I can.
Pat J