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| Philip Duclos "Victorian" IC engine project |
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| Brass_Machine:
Nicely done :clap: Can't wait to see more! Eric |
| kvom:
I was wondering if a round similar to the tailstock jig would work with a steady rest to support it closer to the crank? |
| cedge:
Kvom With a slight mod, I'd think it would work fine. The cut out for the screws would have to be eliminated. I see you're thinking....(grin). Steve |
| cedge:
I'm still simmering the ideas on the con rod, but it hasn't slowed progress on the engine. There are plenty of parts to make while I'm finalizing it's design. Having met some local model machinists of recent, I learned one of them likes cutting gears. I approached him about the gears for this engine and he's agreed to cut them if I supply him with required gear blanks. Hopefully we'll get together later this week and I can learn a bit about it. The instructions for the Victorian give information based on ordered gears and fitting a cam ring to them, however Duclos hinted at making a single piece cam/gear if once could cut one's own gears. With that in mind, I took off in that direction. The gear blanks were first turned on the lathe to match the given specs. I chose to use brass instead of steel for visual contrast against the aluminum. I needed one with 56 teeth at 1 13/16 diameter and another at 15/16 diameter with 28 teeth. After carefully hitting the required diameter for both sizes, the larger blank was moved top the mill and securely placed on the manual rotary table. Now how does one cut a 247 degree arc on a manual indexing tool? DRO to the rescue. The piece was centered and the first cam ramp was to be milled at the "Zero" angle on a given radius. To do this, I asked the DRO to create a bolt circle with a beginning point of 0°. Once the first ramp point was milled, I then asked for another bolt circle with a beginning point of 247° at the same radius. I couldn't have asked for easier and I learned something new. The results can be seen in the photo below. The points were gently milled to round the edges and a file smoothed it all out. A roller will follow the inner circle and will actuate a lever when it rides up on the raised came section. This will eventually control the exhaust valve on the engine Again, everything gets a test fitting. The bushings will be getting trimmed and once the teeth are on the gear blanks they will mesh for alignment. Things seem to be moving relatively quickly on this project right now, but I'm keeping all my fingers crossed. Steve |
| bogstandard:
Steve, Do you think you could put something next to the engine so that we can get some idea of the size please. John |
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