This question came
up recently on one of the woodworking forums I
I took a few photos
demonstrating why you need a sash fillister for sash work.
It doesn't see much work outside of that specialty, but it
can come in handy for moldings.
The glazing rabbet.
The molding (ovolo in this case).
Sash requires a glazing rabbet and a molding profile. The
molding goes on the inside of the window, the part that
faces the interior of the house.
The rabbet is cut on the
outside, so that the "ugly" putty and visual heaviness of
the square edges goes outside the home. To achieve a good
looking sash, it is important that all the moldings line up
A good looking sash joint.