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Bugatti straight 8 cylinder with blower, design, 3D printed molds, castings , machining, assembly

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Foketry

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The last photo in post #60 shows a milled face on the crank web. What was that operation?
to ensure the perpendicularity between plane and 4 holes, I tried to mill the plane before making the holes, but it was a test with poor results.
I preferred to align the turned piece in the vice, check with the dial gauge and drill the holes
 

michelko

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Hi Jules,
you are making great Progress. With that Velocity the engine should run in a pair of weeks.

Michael
 

michelko

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Your Setup with the four Pins is very interesting. It should give a very precise allignement and the screw is only stressed be draw. I used for this connection 4 m3 screws. with no pin the allignement is made with the race of the ball bearing.
The screws are stressed be drwa and maybee also by shearing. So i believe your way is the better solution.

Michael
 

Foketry

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Your Setup with the four Pins is very interesting. It should give a very precise allignement and the screw is only stressed be draw. I used for this connection 4 m3 screws. with no pin the allignement is made with the race of the ball bearing.
The screws are stressed be drwa and maybee also by shearing. So i believe your way is the better solution.

Michael
my solution is 4 pins dia 3 mm and a central M4 screw to guarantee the phase for each cylinder and the transmission of the torque
After crankshaft assembly I will make a grind of bearings seats.
 

Peter Twissell

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Nice solution Foketry. This is the same principal typically used to secure flywheels, prop drivers etc. on 'fullsize' engines.
Another option uses hollow dowels with screws through the dowels. This allows both the shear and tensile loads to be reacted at a greater radius from the axis, giving the assembly greater stiffness.
 

johnmcc69

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Looks great!
How do you dress the grinding wheel to the lathe spindle axis?

John
 

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