P&W 1830 Radial in 1/6 scale.

[Bill Gruby]

With that fixture same location for each end is a snap.

"Billy G"

[Bill Gruby]

Crank cheeks are matched pairs. Blanks are bolted together. The larger pilot holes are 5/16 and the smaller .188 hole is for alignment during assembly.

"Billy G"

[Bill Gruby]

Here I added the Helical Gear for the dual distributor drive.

"Billy G"

[Bill Gruby]

Cylinder Fin Cutting fixture w/spanner. A large amount of tooling must be fabricated for a project like this one. About 1/3 of the total building time is spent here.

"Billy G"

[Bill Gruby]

The 1st set of crank cheeks is nearing completion. This crankshaft is a little complicated. That's the Rod Bearing Shaft fitted in.

"Billy G"

[Bill Gruby]

One step closer.

"Billy G"

[Hawkeye]

You're not kidding about complicated, Bill. I had to go back and look at the rods to understand the offsets on the cheeks. Makes sense now. Good thing you get to turn things by hand before it's time to start it up.

Pretty cool stuff.

[Bill Gruby]

When the rods and crank go together it will seem like childs play. Right now, even I'm a little stymied. When that crank is turning 9500 RPM clearances better be right.

"Billy G"

[petertha]

(02-28-2013, 05:08 PM)Bill Gruby Wrote: The 1st set of crank cheeks is nearing completion. This crankshaft is a little complicated. That's the Rod Bearing Shaft fitted in.

Great pictures. If I understand the parts so far, your master rod is solid, not split? And the crankpin will be retained into the crankshaft cheeks so its removable & master rod can be placed in?

[Bill Gruby]

You got it, that's exactly how it will work.

"Billy G"