I forgot, the crank parts have an interference fit and also 3/0 Taper Pins holding then together.
"Billy G"
(02-28-2013, 11:45 PM)Bill Gruby Wrote: [ -> ]You got it, that's exactly how it will work.
I may have a similar issue on a radial design I'm working on & would like your opinion. How are you retaining the crankpin ends to front & rear crankshaft segments so the shafts are perfectly aligned & the assembly is removable for tear down one day?
I dont think I could fit the crankshaft + master rod as a pre-assembly into my crank case, so it would have to go in order like below. I was visualizing something like a set screw with extended pin segment. This could screw into the web part & pin extend into the crankpin itself. Kind of like a jesus bolt principle. I could reach the screws through a cylinder opening in crankcase. I thought about tapered pins, but with locktite or whatever, I guess that would be permanent, no? Ive also seen where the webs are slotted accross the crankpin hole & the pin is knd of clamped in place. Seems like a lot of effort.
I think my assembly would only fit something like this:
- rear crankshaft half into crankcase through front of case opening, align into rear bearing
- master rod in through CC front, wrist end up into #1 cyl hole
- crankpin comes in, through master rod hole & set into rear crankshaft half
- front crankshaft half into CC through front, it then aligns to crankpin
- button up with CC front cover, front bearing alignment etc., crank journals now aligned to common axis.
- now...somehow 'fix' the crankpin to both front & rear crankshaft web elements
A picture would probably be much clearer. I dont want to subvert your nice post. Just let me know & I can take it off line.
Sounds like extremely tight quarters. Let me think on that one and see what I can come up with. Is yours a single row radial?
The proverbial square peg in the round hole (broached square) It's starting to look like a crankshaft.
"Billy G"
Interesting stuff Bill, thanks for posting this.
Last one today sas, I'm beat. Finish shape of bottom end. Top end tomorrow.
"Billy G"
Front bank of crank is done. 30 hrs. so far in this crankshaft. Onto the second bank, have fun.
"Billy G"
Nice job Bill, it's amazing how fast the hours add up on these projects. How are you going to finish the bearing surfaces?
Tom
Time adds up for sure Tom. You don't see it till it's done. Bearing surfaces will be polished with honing oil and 600 Crocus Cloth.
"Billy G"
Another drive gear needed to be added. This time a modified Boston H3230. Bored and hub turned off, It's done.
"Billy G"