Originally Posted by Bob N

Bj,

I looked at the Katie jig a while back and it is a nice set up for sure for about the same cost. I really think I am going to like the concept of this type jig for making thru DTs. So much eaiser making them on the table rather than on the other type jigs although limited to thru DT's only. Mine was purchased with box making only in mind and the thru DT's are the only ones I am after at this time. You are right about using the correct bits to get the desired results. The Katie jig has an excellent reputation and following.

Joe,

I may be wrong, but as you raise the vertical bit height to allow for thicker stock, you open the vertical gap that will give you tear out when you go back to thinner stock. You want to keep that slot as tight as possible, thus several backer boards are needed for the task. I hope this makes sense, if not I'm sure Bj or someone might could expalin it better.