65 - Our Best Bench Yet, страница 9
JIGS & ACCESSORIES FIRSTs prill hole at each end of slot All that you need here are a fcouple of star knobs, a pair of washers, and a length of threaded rod (Figure 1). Alignment Jig - If you are drilling into odd-shaped workpieces, you can adjust the plates of the jig individually to match the size and shape of your workpiece. BLit for drilling straight holes in dowels or round stock, you want the plates to create a level, even 'V' in the block. So I came up with a simple jig that pushes all the plates into perfect alignment. As you can see in Figure 6 below, the alignment jig starts out as nothing more than a plywood base (C). A T-nut is installed near one edge of the base, and then some hardwood rails (D, E) are glued and screwed to three sides of the base (Figures 6 and 6a). The last part of the alignment jig is the alignment plate (F). This is |ut from V4" hardboard and is sized to fit between the two side rails of the base. A 7/i6M-wide slot is cut in the plate blank ^ stop block secondNC with stop blocks in place, make multiple ^ passes to cut/> slots GROOVES to fit v4" hard board splines middle of the plate for a knob with a threaded stud. (This slot should be positioned so that it will line up with the T-nut that is already installed in the base of the jig.) Before adding the alignment plate to the jig, you'll need to cut a large opening along the back edge. The width of this opening is sized to match the length of the V-block. This way when you are using the jig, the V-block will be surrounded on all four sides by the clamp stop block to miter gauge, then miter corner of v-blocks /// jig, making it a snap to quickly square up the plates as shown in photos A and B below. Now you can move on to building the drill press table and hold-downs. star knob w/ X 1" stud #& x V/2" Fh woodscrew ALIGNMENT PLATE (1/4" hardboard) Vi) SIDE RAIL (11/2" x 12%") NOTE: base is plywood; back and side rails are 34"-thick hardwood centered notch equals length of v-block plus Ve" No. 65 ShopNotes 9 Set Up Jig. To square up the V-block, place it on the base of the jig and loosen the knob that holds down the plate. m Square V-Block. Slide the alignment plate forward until it contacts all the plates, squaring up the V-block. |
