Engines > Your Own Design

Oscillator Cylinder Pattern

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vtsteam:
Thanks guys!  :cheers:

CI: I've used both. I don't like to generalize, different methods for different requirements and materials.

For Portland cement bound sand cores (per luckygen1001), of >= 1" dia, and using flexible plastic PVC pipe, a single slit usually works. Some thicker PVC pipe samples I've found don't separate well with a single slit, but can be split and hose clamped. Other samples have worked okay with a single slit, I've found.

For baked sand cores <1" dia I use steel tubing or pipe and splitting and reassembling those with hose clamps is the way to go because I can bake the core in the box that way. Plastic pipe would require transferring the cores to a bed before baking.

Portland bound cores, tend to be too fragile in sizes below 3/4" during a pour in iron, even with wire reinforcement in my experience, so I use baked sand cores for that.

I'll be using Portland bound cores for this one, btw.

Paul R: Thanks -- hope this will be helpful! :cheers:

Jason:

Fabulous pics! Very appreciative!  :ThumbsUp: :ThumbsUp: I like the side blocks for the valve base a lot. My valve base is a lot closer to the end cheeks, and by the time I fillet both, I think it will probably fill in that area.

I was thinking about possibly making the valve face block a loose piece, pinned in place by the trunnion axle. That way I could remove it and substitute a conventional steam chest block to make a multi-purpose pattern. Sort of a Tinker-Toy approach. Yup to a boss on the other side -- just planned a through dowel. I don't know if I can pull a loose piece off, we'll see. (Hmm, unintentional pun...)

I'll be doing that all today as soon as my wife leaves the house for lunch with a friend. She hates the smell of Bondo, and the shop is too cold to cure that stuff out there. (5F this morning and breezy)

She said it was okay to do while she's gone.  :smokin2:

Jasonb:
Round valve chests and covers are not unknown so you could just use the one pattern.

vtsteam:
Jason, wow, what does the valve inside look like?

crueby:
Just looked up the patent for it - instead of a rectangular valve and straight ports like we are used to, the Church one has a round (disc) valve and the ports are arched as well. The valve can rotate, and was intended to reduce wear on one side or the other. It operates just like a typical rectangular one, sliding back and forth over the ports.

vtsteam:
Thanks Chris, does it rock around a pivot or does it reciprocate back and forth? If back and forth it must be smaller than the case? So does it have any kind of guide?

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