68 - Our All-New Router Jig, страница 16
Sliding Table. To
rout a mortise, the table slides from side to side on the tapered bed.
With the tapered bed complete, the most difficult part of building the mortising machine is behind you. The next step is to make the sliding table that rides on top of the bed.
The table is just a piece of plywood with a couple strips of aluminum bar stock screwed to the edges. This aluminum hangs down and creates a lip on both edges of the table. This allows the table to straddle the top of the tapered bed and slide from side to side (Figure 6).
To make the sliding table, I started by cutting a piece of plywood for the table (E). This piece needs to be carefully sized to match the width of the tapered bed top. Once this is done, you can cut a couple of dadoes across the table for some aluminum T-track that is added later (Figure 7).
The next step is to add the aluminum bar stock to the edges of the table (Figure 7). Both pieces of aluminum are the same size, but they require a little different treatment The piece on the front edge is attached so that it is flush with the top of the table. After screwing it in place, mark out the location of the dadoes on the inside face of the
aluminum. The remove the aluminum and cut and file the notches following the steps in the box below.
On the back edge of the table, the aluminum stands proud of the top of the table by Vs" to create a lip. (This lip will act as a fence for the work-piece that is being mortised.) After the aluminum is screwed in place, a shallow notch can be filed down at the center, so it's flush with the table.
Once you have the aluminum screwed to both edges of the table, you can place the table over the tapered bed and check the fit. The
table should slide smoothly side to side without any play. If the fit is too loose, you may have to remove the back aluminum piece and trim the table slightly. If the fit is too tight, try sanding the back edge of the top of the tapered bed. Shop Note: You can improve the sliding action of the table by waxing the top of the tapered bed.
T-Track - Once the aluminum is attached to the sides of the table, the T-track can be added. The T-track will be used along with a couple of hold-downs to clamp the workpiece
STRIKE PLATE 0/e>" x %" ALUMINUM, V/z" LONG)
SIZE TABLE TO MATCH WIDTH OF BED TOP
ALL PIECES ARE 3/4n PLYWOOD
16 ShopNotes No. 68
A Cut. To create the notches for the T-track, start by cutting a row of kerfs with a hack saw.
Jk Snap. Using a pair of needle-nose pliers, snap off the remaining waste pieces one by one.
A Fiie. Finally smooth out the bottom and sides of the notch with a narrow, triangular file.