The bearing housing sits at the front of the engine and contains the first bearing that supports the crank shaft and the propeller.
The front of the housing has a 3/4 inch radius. I felt that is a bit big for a form tool so decided to cut this “old school”.
The initial radius was formed with a rough step cut using a X/Z feed chart that I first created in Excel.
The rough steps were covered in layout fluid making sure to get the fluid into the base of each step as this is the reference line for the completed radius.
Using a file on a slowly turning lathe, the steps are smoothed and the shape refined.
Once all the blue between two steps disappears , that point of the profile is at the correct depth. Working steadily, the entire radius is refined.
I’m happy with the way the completed radius turned out in the image above.