I finally got around to trying out my new mortising attachment for my new delta drill press. Contrary to some of the posts I read in this ng, it is awesome. It is a breeze to set up and not difficult to square (square enough) to the fence. The attachment (model 17-924) says on the box that it is a "New Improved Design". I had to raise the depth stop on my drill press up on the shaft in order to accept the collar for the attachment. I lose about a 3/4" in quill travel, but I can always lower the depth stop back down after removing the mortise attachment. It came with 4 mortising chisels (1/4", 5/16", 3/8" and 1/2"). The attachment goes onto the drill press without using ANY wrenches or tool of any kind. Quick and easy. The only thing that was somewhat of a pain to put on was the fence, but I plan on leaving this on when using the drill (unless it gets in the way).
I tried the 1/4" chisel to mortise some red oak and it went through like melted butter. Squaring the chisel to the fence, which can be a problem as some posters have stated, but I think I have found a method that gets the chisel "square enough" After all it doesn't have to look pretty, because the mortise his hidden behind a tenon.
**** (four stars)