- Sep 12, 2014
- Reaction score
- Modena (motor valley) Italy
Higher temper tempWhen assembling crank pin with flywheel under press, I discovered this error, the hardened material is too brittle, the pins break ! Diameter is 12mm (.43 inc)
This material is tool steel, used for reamers and taps: 115CrV3 ( European standard) , L2 Aisi/SAE standard (USA), easy to harden in water or oil, but after quenching at 790 degrees C , tempering at 250 degrees is required to reduce fragility.
this break is also favored by the sharp edge of the groove for oil distribution and the hole.
it would be appropriate to make a radius at the bottom of the groove, but now all the pieces are done
I'll do tempering at 250 C°
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I assembled the crankshaft : connecting rod , flywheels , internal bushings and gear.
To ensure perfect alignment of the flywheels I made a final turning on external diameter, I left an allowance of 0.5 mm
The space between one flywheel and the other has been filled with glued wood to avoid distortions between the tailstocks
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The original Porsche crankshaft
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[/QUOTE were did you get the shell bearings ?
All i can say is WOW ! I wish i could visit you in your shop and watch you doing that magic stuff.
I have used sodium carbonate in the past, I also tried degassing flux tablets with not always good resultsFantastic work! The castings came out brilliantly!
Do you use any type of compounds to degas/flux when casting to get such a good result?