As a new owner of a table saw I have spent the last weeks making jigs and learning what these machines (or at least mine) are capable of. Among that repertoire is tenons. Specifically the jig that runs the board on end to cut the tenon. The jig was easy to make and the operation is straight forward. Adjust the jig to set the width, set the blade height, and cut a tenon. Unfortunately as sure as my blade turns, there will be tear out. This type of jig is especially prone to tear out because of the vulnerable position of the work piece.
I made one tenon – tear out; two tenons – tear out; three tenons… Ok I can hide two blemishes but not three. Something has to be done to fix this. So here is what I did.
using a straight edge, pencil, and razor I marked the depth that the saw blade would cut the tenon. I then scored that line with the razor.
Next I turned to the vulnerable corner (the last corner to run through the saw on the jig) and cut the last bit of grain along the line I had marked.
IT WORKED!!! When I ran it through it left a clean edge with no tear out on the back side. I’m sure I’m not the first to do this but I thought I would share anyway.