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Old 08-08-2010, 06:00 PM   #1
Dan Rowe
 
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Default Bottle frame steam engine

Progress has been slow on this build but I have a couple of of cylinders done.

This is the metal wax injection mold with full steam passages. The injection point is rubber that I vulcanised in a bolt on part.


This is the other side.



The exploded view.



The port repair tool.



Test wax to show steam passages.



Bronze cylinder.



Dan



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Old 08-08-2010, 07:07 PM   #2
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Default Re: Bottle frame steam engine

Hi Dan

That is a great looking injection mold. And the cylinder looks great too. I can not wait to see the rest of the engine.

Tim



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Old 08-08-2010, 11:49 PM   #3
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Default Re: Bottle frame steam engine

Wow, Dan! Very interesting. Might be a dumb question, but is there some characteristic of this part that makes the port repair tool necessary? The tool looks like something you planned for in advance.
Dennis

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Old 08-09-2010, 12:57 AM   #4
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Default Re: Bottle frame steam engine

Hi Dan,

Damn fine work!....I look forward to the rest of it too!

Dave

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Old 08-09-2010, 01:00 AM   #5
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Default Re: Bottle frame steam engine

Thanks guys for the coments.

Dennis, yes the port repair tool was part of the plan. As this is a small cylinder the grid is 1/4" the way I made the curved port cores it did not leave much room for the gasket to seal the covers.

This is actually a 7/8ths scale Shay cylinder which is why there an extra mounting face. I plan to make a bottle frame engine first for a test.

Here is a photo of the port face, and the mounting face. I was having problems with the mounting face dishing in so I added the samll plate to make that section thinner which is exactly what the Lima Works did and where I got the idea.



The port cores are made from stacked sheet metal. The ports are 0.040" with the exhaust a double thickness and the bridges are 0.050"




The port core block has counter bored screws that act as stops so when the block is pulled out of the wax it only travels far enough to clear the wax model.

Dan

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Old 08-10-2010, 02:00 AM   #6
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Default Re: Bottle frame steam engine

Most of the machine work for the mold was normal with two interesting parts.

This is the fixture I used to file the holes in the mold end plates for the curved cores. The end plate fits in the slot on the base block and the center pin keeps everthing true.



To machine the ends of the port cores to have a curved end I made a hand powered belt sander with pneumatic feed.



Dan

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Old 08-10-2010, 12:59 PM   #7
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Default Re: Bottle frame steam engine

Pat,
Yes I used lost wax casting. The investment which looks like plaster of Paris is used to make the mold cavity for the hot metal.

Note: DO NOT use plaster of Paris for lost wax casting!

Here is a link to Abby's work in the specialist section.
http://www.homemodelenginemachinist.com/index.php?topic=4816.0

Here is a casting thread with some of the equipment used and a photo of my setup.
http://www.homemodelenginemachinist.com/index.php?topic=10197.0

Dan

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Old 08-23-2010, 04:38 PM   #8
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Default Re: Bottle frame steam engine

Hello Dan,

a picture of a none finished bottel engine. A Friend of me is running a engine museum with original engines. About 80% of the engines in a running condition. In case You like information let me know.

Attached Thumbnails
_5176645.JPG   _5176621.JPG  
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Old 08-23-2010, 10:50 PM   #9
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Default Re: Bottle frame steam engine

Manfred, Thanks for the photo. This engine is a freelance design from a few photos of the type and the one you posted is what I am shooting for.

Pat, mostly I use vulcanized rubber molds just like the jewelry trade. I never had any luck with a cylinder with a core for the bore only. The thicker section was caving in with both the wax injection and the metal casting. I finally went to a fully cored cylinder very similar to the original design and the shrinkage problems were solved because there were no longer any thick sections to cause problems.

The port repair tool fixes the end so a full cover gasket is used. There might be another way to core the steam passages but this is the simplest method I could come up with.

4 Jaw chuck (A)



4 Jaw chuck (B)



Bore cylinder.



Ream Cylinder.



Face end.



Trim cylinder rim with micrometer stop.



Trim and face other end.



More parts.



That is the project to date.

Dan




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