Chris,
   The best explanation I've seen of how this works is from Bob Smalser, in
an article posted to wkfinetools.com

http://trestore.wkfinetools.com/saw/strSawBlade/strSawBlade1.asp

On Thu, Sep 7, 2017 at 11:48 AM, Christopher Dunn <
christopherdunn123@g...> wrote: