Engines > Your Own Design
Oscillator Cylinder Pattern
PaulR:
:ThumbsUp: I know nothing about casting and pattern-making so this will be an education if I can keep up with it.
My garage workshop is also fairly cold at the minute although I have a double thickness strip of carpet in front of my bench to help with the concrete floor. I have so few sockets that I don't have any heating in the evenings thanks to those bloody Christmas lights :cussing:
Jasonb:
Now if you want that larger engine to perform you will have to start looking into slotted ports rather than the simpler holes that tend to be used on smaller engines :LittleDevil: This generally allows more steam/air in and out sooner a bit like having a wider slot on a slide valve engine Also conside a couple ofg small blocks between the round port body an dthe end flanges so you don't have to drill the passages very close to the cylinder walls.
Also it starts to become a heavier weight hanging off the pivot pin so depending on whether you are making a vertical or horizontal engine you may want to add a boss on the opposite side of the cylinder you a support.
Having the core tube split in two is a lot easier to get green sand cores out of as they are a bit more fragile than bonded cores where springing a single slot apart may work.
PaulR:
--- Quote from: Jasonb on December 15, 2025, 07:48:28 am ---Now if you want that larger engine to perform you will have to start looking into slotted ports rather than the simpler holes that tend to be used on smaller engines :LittleDevil: This generally allows more steam/air in and out sooner a bit like having a wider slot on a slide valve engine Also conside a couple ofg small blocks between the round port body an dthe end flanges so you don't have to drill the passages very close to the cylinder walls.
--- End quote ---
In the first photo, does the matching end cover have a notch in the spigot as well?
Jasonb:
Yes
PaulR:
:ThumbsUp: :ThumbsUp:
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