Hello! I just was watching the 3 videos of Jerry Bennett. In the second video, he created what he called complimentary segments by setting the wedgie sled off-center.

I use a wedgieless sled so I am not sure how to do this. The sled I use have various angles locked in by using a pin. The sled is marked for each angle using the number of segments you want to make. i.e. 12, 16, 24, etc.

How would I make these "complimentary" segments using my sled?

Thank you

Jim

The complimentary angle is what you get from the 2nd cut of a wedgie sled. ALL sleds, whether a wedgie or single–fence sled have multiple errors - the blade isn’t exactly 90 degrees from the table, the angle is perfect, the fence(s) are not oriented correctly to the blade, etc. When you make your first cut on a wedgie sled, all of those errors exist. When you put a perfect wedge between the two fences of a wedgie sled and make the second cut, all of the errors are multiplied by a minus 1 which means that one edge of the segment has complimentary angles to the opposite edge. When you glue two of these imperfect segments together, the complimentary angles zero out the errors. If you make a ring of these segments, every joint is corrected by the complimentary angles and you will have a perfect ring, even though none of the segments are perfect.

It is not possible to duplicate this functionality with a single-fence sled.

There is a simple way to make a template for making your own wedge, though. If you have Woodturner PRO, make a ring of the desired number of segments. Adjust the diameters so that the outside diameter is about 20” and the inside diameter is about 10”. Switch to the Segment View and if the image completely shows on your screen, you can print it to a laser printer and use adhesive spray to glue it to a thin piece of plywood or MDF or plastic and sand it to the lines. If it doesn’t fit your screen or the print preview, adjust the diameters until it displays completely.

The Segment View gives you three dimensions that you can use to verify the accuracy of yo ur sanding: the width of the wedge and the width of the large SEL and the opposing small SEL. If all three of these measurements match the calculations on the Segment View page, it is a perfect wedge.

It isn’t necessary that the entire lengths of the angled edges of the wedge be sanded correctly. If just the last 1/4” of each of the two angled edges are correct, you can rough saw the remainder of those edges as long as the are all narrower than the lines. This will still allow the wedge to separate the two fences accurately.