That calculation assumes that the current edge is an arc of a circle, which
it may not be. Do we know that Stanley ground them as an arc of a circle?
How has the grind been changed over its lifetime since then?

--Chris 

Check out H-frame, the site for vintage Black & Decker Workmates:
https://h-frame.weebly.com/

-----Original Message-----
From: oldtools@g... [mailto:oldtools@g...] On Behalf Of Bill
Kasper
Sent: Friday, May 07, 2021 4:22 PM
To: Marvin Paisner
Cc: Don Schwartz; porch
Subject: Re: [oldtools] Scrub planes

given the 1/8" arc height, and the 1 1/4" chord length, we're looking at a
circle with a radius of 1.63" for a stanley #40 camber.