The Home Machinist!

I'd sleeve it back to 1/2", and then make bushings with 1/2" O.D to accept 3/8", and 1/4" boring bars.

Example bushing types.
https://www.sommatool.com/catalog/acces ... shings.asp

Assembled crankshaft. Rotating assembly being lowered into the crankcase.

The two holes are for extended range as well as internal and external cutting.

Seeing that the boring bars themselves are two different sizes, I would guess that the 9/16" hole was an error when sizing the holes originally!

1 in 12=4.7636 degrees.

5 degree tapered end mills

https://www.travers.com/3-flute-tapered ... tname=SITE

Just do this five more times tomorrow and the crankshaft will be assembled.
The crankshaft is brown due to the preservative I have on it. The journals get cleaned off as it gets assembled.

Harold_V wrote: ↑

Wed Jan 13, 2021 3:13 pm

Do you do the shot peening in your shop?

No, I send it out.

It is a CNC/Robotic process specific to these rods so the entire part has exact, perfect coverage.

Connecting rod after mag inspection and shot peening.

In that application, It doesn't look like the angle itself is critical, just that the two parts mate up properly. If you tilt the head, and then machine both, they will match. If you tilt one part to mill it, and then tilt the head to mill the other part, they may not match properly. For that method...

As stainless alloys go, it's easy to weld via the tungsten-inert-gas (TIG) process, using tri-mix as the shielding gas and a compatible filler. Why not Argon? Argon is suitable but the weld quality may not be as cosmetically pleasing. In my experience, tri-mix seems to be more forgiving with stainl...

BigDumbDinosaur wrote: ↑

Tue Jan 12, 2021 1:46 am

As stainless alloys go, it's easy to weld via the tungsten-inert-gas (TIG) process, using tri-mix as the shielding gas and a compatible filler.

Why not Argon?

I bought that gasket from someone else.

More nice parts!

Assembling a Packard Merlin two stage Supercharger.

Second stage Impeller. Second stage completed. First stage diffuser First stage Impeller.