PM Research #5 - how do I bore the main crankshaft journals?

[nz120]

Hi Nz120, I'm curious as to why you are using a rotary table ?

Baron

I set up the rotary table to allow me to rotate to a 45 degree angle for the valve slide recess to be milled. I squared up the casting using a dial gauge along the flat of milled face of the valve guides on the casting and then rotated.
When I do the second kit I am thinking to mill square faces to the base of the frame casting so that I have true faces against which to make it simple to mount and remount - i.e. If I had done this then I could easily set at 45 degrees onto the bed of the mill.

Being self-taught, the "obvious" solution to any problem is
not always obvious to me haha

 

[nz120]

using the rotary table for milling of the valve guide, and the clearance slots for access to the main journal cap screws.

 

[dwentz]

Almost the same story as yours. Started 10 years or so ago, second marriage, kids, other hobbies. Finished building mine this weekend. It’s a great runner, ticks over on about 3 lbs of air after breaking it in on 6 lbs for 30 min. still need to get a nice coat of paint on it.
When I started mine I milled the bottom flat, then the crank journals and valve guides. All other operations used those as a reference.

 

[nz120]

Almost the same story as yours. Started 10 years or so ago, second marriage, kids, other hobbies. Finished building mine this weekend. It’s a great runner, ticks over on about 3 lbs of air after breaking it in on 6 lbs for 30 min. still need to get a nice coat of paint on it.
When I started mine I milled the bottom flat, then the crank journals and valve guides. All other operations used those as a reference.

thanks for the encouragement....I am enjoying getting back into it....Covid-19 has given me more time..if only someone would pay me to partake in my hobbies haha