LOCATING RABBET

Comment

Comment by bob mitchell on August 27, 2010 at 8:09pm

Comment by bob mitchell on August 26, 2010 at 8:28am

Clyde diagram and commentary concerns locating the rabbet from existing structure.
" " Extend that line from the outside surface of the frame down to the stem using a short piece (5 or 6 inches long) of ¾ inch plywood no wider that the thickness of the frames, . The angle of the piece against the stem is the angle of the rabbet; the corner that touches the stem (inside surface of the plywood piece) is the bearding line. If you can hold that piece in place (1” brads should hold it, heads driven flush) place another piece like it on top and slide that piece down to the stem. The corner will touch the stem at the “rabbet line.” Mark the stem at both places where the inside corner of the “tools” touch the stem. With both the bearding line and the rabbet line marked below each frame, spring a batten from point to point for the length of the rabbet on each (separately) and scribe a line connecting each point as marked. This will give you a long sweet curving line for both the bearding line and the rabbet line. The angle formed by the lower end of the frames will give you the angle of the cut at each frame. If the angle changes from frame to frame the angle must change as you proceed from frame to frame while cutting the rabbet. The angle formed at the “middle rabbet” is 90 degrees for the full length of the rabbet to match the 90 degree edge of the plywood planking."
Further discussion can be found in "Planking Plan" forum.