|Project by Jim Finn||posted 01-09-2012 09:20 PM||6206 views||39 times favorited||11 comments|
In order to make these round and tapered objects I made a Jig/Sled. I got the idea from an old video I saw years ago. First picture shows the completed sled and the second the same sled with a piece of poplar ready to be cut. Also pictured are details of the hold down and of the end stop. The underside of the fence is shown with the “T bolts” protruding through the bottom. Included is a photo of the underside of the sled showing how I made the slide fit the “T” shaped guide in my table saw. I did this so that the sled will not tip out of the slot at either end of the travel of this sled. The washer works as a keeper to achieve this. I used a “T” track kit from Rockler and 3/4” MDF to make this .The sled measures 18” x 24” and the movable fence measures 5” x 30” I recessed the “T”track a bit and added some Masonite to the underside of the sled to get it recessed enough. I make tapered pieces to form vases and waste baskets as shown. I decide how many sections I want to make the object withand what width using a little geometry exercise. Circumference distance divided by the number of sections gives me their width. The cut angle is determined by the number of sections. 10 sections …360 (degrees) divided by 10 sections = 36 degrees. Divide this number by 2 because each miter is made up of two cuts , in this case 18 degrees each cut. (1/2 of 36 degrees).I set my table saw blade tilt to this number (18) using an digital angle gage. Set the sled to the taper desired and cut the sections using the hold down and end stop to position the workpiece. I make about 2-3 extra sections when making a project for two reasons. One is that I use cedar a lot and it sometimes splits or fails in cutting and the other is that when I assemble the item I add or remove a section to get the angles to fit best. The angle may not be perfect at 18 degrees depending on how much taper you have on the object.
-- "You may have your PHD but I have my GED!"