Gallery, Projects and General > Mod-Ups!
Pipe and Bolt Engine Mod-Up
vtsteam:
I drilled the center crank hole first, then pushed both webs onto the nail crank and super-glued all together lightly. Then I mounted the Dremel grinder onto my toolpost and ground the circumference of the webs while holding the nail in the 3 jaw. I figured I couldn't turn it with a lathe tool with breaking all apart. The grinder is a little slower but doesn't apply a lot of pressure
When that was finished, I re-chucked the webs in the 3 jaw, and put my milling attachment on the lathe and bolted a flexible shaft tool to it. I used a DTI to place a crank hole 5/16" above the center, to give me a 5/8" throw.
vtsteam:
Then I assembled the crank, crank pins and webs in the vise. I brazed the crank pin to the webs, but didn't weld the crank. Since I don't have a split bearing on this motor, I will have to assemble the crank in place in the engine when the time comes. I cleaned up the webs and pin with a file. This is where I'm at now:
shipto:
wow your really steaming along, I am still trying to decide what to do about feeding shot of air to my piston.
vtsteam:
Well shipto, I haven't got that figured out either! I've been doing the easy parts.
I'm thinking of an external cam and piston valve. I don't think I can squeeze anything more inside the crankcase as it is.
Another hangup might be whether I've got enough clearance fo the connecting rod to miss the lower part of the cylinder. This is why people actually design engines first on paper before building them. Or screen.
But it is fun this way, for me. Figuring out the problems I make for myself. :)
I was very tempted today to assemble the crankshaft in the engine and solder the webs to the shaft. But I resisted in order to start on the con rod to see what is possible for swing. I've already fixed the throw at 5/8" by brazing in the pin. Guess we'll find out what the consequences of that decision is.
It sure helps an understanding of engine design to try to build one first!
Manxmodder:
You can always make a rubber con rod if there ain't enough clearance. See, I'm full of smart solutions today
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version