The Craftmans Shop > Model Engineering
Side Valve i.c. engine from Bar stock
PekkaNF:
Hi Brian,
did you first turn all fins round and then milled flat on them or other way round? I have some cat iron offcuts but ita allways machines beutiful, althoug pretty messy. I use shop vack pretty much all the time, specially if I am boring. I really don't like that mess on my chuck, backplate, spindle and all the way down to change gear.
Pekka
Brian Rupnow:
PeckaNF--I turned everything round first, then machined the flats. Experienced no trouble whatsoever. I machined it dry, no coolant. only trouble I encountered was the different sized fins, and that was my fault.---Brian
Brian Rupnow:
I don't post a lot of "in process" shots anymore, but tonight I thought I would put up a shot of the beginning of the aluminum combustion chamber. I have marked out the outer profile, bored the 1" through hole, and the 1.160" diameter counterbore. You can see the cylinder setting on the end of the work. When I bore holes to a critical fit, I do a lot of "try it and see if it fits yet" with the mating pieces. After a summer of engineering work avoidance, some of my customers are calling me up and asking to have their projects worked on "Right Now", and if I ignore these folks they find someone else and I never hear from them again. Between the engineering work and work fixing up the house I bought, I am sometimes hard pressed to find a bit of time to machine my own stuff.
Manxmodder:
Interesting project you're doing here Brian. I wondered what you plan to do for a spark ignition system,create something from scratch or use a flywheel magneto type from a petrol strimmer or chainsaw maybe?
Just a little thought on the error with machining the cylinder fins,if you machine a chamfer on the outer edges of the 3 thick fins at the bottom of the cylinder it would improve their proportional appearance to the thinner ones at the top.....OZ.
Brian Rupnow:
Hello Manxmodder.--glad you stopped by to say hi. I am going to use a set of 1980`s Chrysler ignition points and condenser. I have about about 9 engines, so have made up a separate ``power box``containing a 12 volt coil and the appropriate wire leads that let me move it from engine to engine. That way it becomes inexpensive (less than $20) to buy a set of points and a condenser for each engine.
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