Should be 'a piece of cake' compared to Normans....
Napier dagger , it's an amazing engine, they look like 2 Porsche 917 engines stacked on top of each other ...
Should be 'a piece of cake' compared to Normans....
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°
View attachment 123887
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
View attachment 123991
View attachment 123992
View attachment 123993
The original Porsche crankshaft
View attachment 123994
[/QUOTE were did you get the shell bearings ?
Your work is looking great, hope you get to complete it. Normans Dagger was manually machined from solid, No castings /No CNC .Napier dagger , it's an amazing engine, they look like 2 Porsche 917 engines stacked on top of each other ...
All i can say is WOW ! I wish i could visit you in your shop and watch you doing that magic stuff.Today the first aluminum casting, half engine block for 6 cylinders
the pattern in petrobond sand ,internal side
View attachment 124200
View attachment 124203
Front side
View attachment 124204
View attachment 124205
All i can say is WOW ! I wish i could visit you in your shop and watch you doing that magic stuff.
Can you show a pic with an outside view of the case half?
Fantastic work! The castings came out brilliantly!
Do you use any type of compounds to degas/flux when casting to get such a good result?
Enter your email address to join: