Mortising Table DetailPlease forgive the "upended" view, which was easier to photograph.
Here's a top view of the mortising table, showing its fence and bolt slots for fore-aft adjustment.
The fence is a 3-layer glueup of net 3/4" oak with semicircular reliefs for handle clearance to maximize potential travel. It's fastened to the table via 5/16 bolts through the holddown base casting and extending to T-nuts beneath the table surface.
As with the drill press table, the mortising table has been made flat, varnished, sanded, and waxed to control moisture migration and to reinforce the particleboard's surface.
I anticipate a litle further work in installing lever-actuated clamps and/or through-holes and T-nuts to mount cam-type workpiece hold downs when usage defines their need.
Incidentally, the Grizzly mortising attachment was a nice bargain, but it took a lot of filing to get the flat surfaces truly flat, square, perpendicular to the world, and whatever else counts toward making the assembly reasonably accurate.
Bottom view (front is to left.)
T-nuts for fence through-bolts are visible. The groove at center left is clearance for microadjuster bolt.
The resting surfaces are the pieces with slots, which extend slightly below all other other parts so as to ensure freedom of movement. Those surfaces have been made flat, then varnished, sanded, and waxed.
The table locking bolts must go through these pieces so as to ensure against any unresolved bending forces - all bolt tightening to lock the table via the topside knobs goes through solid wood-to-wood contact points, and thus invites no distortion.
Consistency might have suggested that I add HDPE sliding surfaces somewhere here, but I finally decided that movement will be so slight and so seldom that there's really not much likelihood of surface damage. Should that assessment later prove to be in error, I'll simply add a strip of Rockler's 10mil HDPE tape.
The underside of the drill press table looks very much like this, but with four inset T-nuts for the mortising table locking bolts.