Hallo Dirk, Johannes, Joachim und alle anderen,
Nachdem mir seit gestern die freundliche Genehmigung des Verlags vorliegt, darf ich wie versprochen den Artikel mit Bildern aus finewoodworking.com zur Sitzflächenausformung mit der Oberfräse hier einstellen. (Der Links war ja leider nur für Mitglieder sichtbar).
Ich finde die Vorrichtung witzig, praktisch interessant vielleicht für passionierte Windsor-Stuhl-Bauer.
Und hier der Artikel:
Shape Chair Seats with a Router
by Bill Garner
The purpose of this fixture is to shape wooden chair seats so that
they fit the body. The outside tracks of the base are higher at the
ends and lower in the middle to match the desired profile of the
chair seat. The outside tracks are used with the back cross-carriage
to shape the seat’s back. The inside tracks are used with the front
cross-carriage to shape the pommel (front).
The back cross-carriage has a smooth concave shape and extended ears
to ride on the outside tracks. The front cross-carriage has a double
concave shape and shorter ears so that it rides on the inside
tracks. The auxiliary router base rides on the cross-carriages.
To use the fixture, position the seat blank in the base and tighten
with threaded knobs. Install a bowl-and-tray router bit (available
from Amana; part No. 45986; www.amanatool.com) in your router and
bolt the router to the auxiliary router base. Place the router in
the back cross-carriage and adjust the depth so that the bit takes a
light cut. Standing at the back of the chair seat, push the router
forward to take a light cut. Step the router a small increment to
one side and repeat the cut. Continue until you have scooped the
entire seat at that depth. Now lower the bit about 1/16-in. and
repeat the process. Keep repeating until the depth of the scooped
area is 3/8-in. or more. Leave a flat area for spindle holes.
Now remove the back cross-carriage and replace it with the front
cross-carriage. Repeat the process to shape the pommel at the front.
While routing, it is a good idea to install a small C-clamp at the
back end of a track to prevent pushing the cross-carriage off the
end of the track and gouging the seat.
After careers in education and real estate, Bill Garner returned
full-time to woodworking, where he has concentrated on building and
restoring period furniture. In a class on Windsor chair making, he
learned that making the seats by hand was labor-intensive. He built
this jig to speed up the process.
Drawings by Jim Richey.
Aus: FineWoodworking.com, publiziert in
Fine Woodworking Magazine #188, Winter 2006/2007
Copyright The Taunton Press