03-01-2013, 04:49 AM
I forgot, the crank parts have an interference fit and also 3/0 Taper Pins holding then together.
"Billy G"
"Billy G"
P&W 1830 Radial in 1/6 scale.
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03-01-2013, 04:49 AM
I forgot, the crank parts have an interference fit and also 3/0 Taper Pins holding then together.
"Billy G"
03-01-2013, 02:50 PM
(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.
petertha, proud to be a member of MetalworkingFun since Sep 2012.
03-01-2013, 03:07 PM
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"
03-01-2013, 04:17 PM
Interesting stuff Bill, thanks for posting this.
sasquatch, proud to be a member of MetalworkingFun since Jul 2012.
03-01-2013, 06:25 PM
Last one today sas, I'm beat. Finish shape of bottom end. Top end tomorrow.
"Billy G"
03-01-2013, 08:29 PM
Looking real good Bill.
Free advice is worth exactly what you payed for it.
Greg
03-02-2013, 10:39 AM
Front bank of crank is done. 30 hrs. so far in this crankshaft. Onto the second bank, have fun.
"Billy G"
03-02-2013, 10:45 AM
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
03-02-2013, 10:53 AM
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"
03-02-2013, 12:26 PM
Another drive gear needed to be added. This time a modified Boston H3230. Bored and hub turned off, It's done.
"Billy G" |
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