Custom Angle Jig For Coffin Lids?

Wouldn’t a tapering jig solve your problem? Set the top angle on the jig and then cut, set the bottom angle cut again.

http://www.righttoolusa.com/p/Woodtek-825014-Machinery-Accessories-Table-Saws-Tapering-Jig-21716661.html?gclid=CKnnueWd8boCFa1QOgodnA8AEg

-- Nick, “I am always doing what I cannot do yet, in order to learn how to do it.” – Vincent Van Gogh

This may trip you out:

1. raise your table saw blade to 3/4” high.

2. Make an attachment to your table saw fence which
protrudes flush with the left side of the table saw
teeth or extending a bit past. The blade should barely
graze the board (called a template guide board here).

3. Make a template of the shape you want in 1/4” or thicker
material.

4. Tape your template to the piece you want to cut out
using double sides tape or use screws if you can tolerate
the holes in the finished part.

5. Run the template against the template guide board,
trimming the workpiece underneath to match the
template (or a little bit larger if the template guide
board extends past to blade teeth).

Use push blocks to handle the work piece.

The same technique works with the band saw and router table.

The problem with taper jigs for this cut is little variations will
make the obtuse corners at the widest section of the
coffin lid not always match up. It can be fussy to track
down the issues, though of course a shape can be refined
easily on a belt sander or with a hand plane.

Great idea, although something I would have never even considered. Thanks! I’ll have to give them a try.

If I were to make these (I do make a LOT of boxes) I would make the whole box, top ,sides and bottom all glued up and finished. Then cut off the lid in a band saw and attach hinges. Perfect fit ,quick and easy.

-- Website is https://craftingcouple.com/

Great idea. I had considered that, just like making a one piece cabinet box and then cutting it open. It’s an odd shape, so the fit would be perfect that way each time.