Quote:
Originally Posted by Eric Roach
George: In your opinion, what size sphere do you think would give the appropriate cup depth in a Frech-sized popper (1⅛")?
For arc comparisons, below are relative spheres at 1", 1½" and 2".
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I'd be looking for 4" diameter. The cup is at an angle so it needs to cover more than 1 1/8 ". The Gibbs polaris has a very shallow cup.
Too deep and the plug grabs too quickly and tends to cartwheel or chug.
Someone on SOL years back posted a system where they turned a ball between centers on their lathe (think of a baseball with a dowel through it) then glued sandpaper onto the ball and shaped their poppers. I tried it but couldn't get the sandpaper to stay on the curved surface very long.
As for shaping by hand, I find the rasp grabs as I come across one quadrant of the plug and ruins things. Trying to use a guide doesn't work since the face is at an angle and unless you want a face to match the balls diameter you have to swing the plug while you rotate it.
Possibly there is a shaper cutter out there that would work, but I've not found it.