41 - Fold-Down Drafting Table, страница 23
FEATURE PROJECT T-Square_^It's not a difficult thing to hold a T-square against the edge of a drafting table. It's just easier if you don't have to think about it. That's why I like the T-square on this drafting table. It slides up and down on the aluminum channel which automatically holds it square to the table. guide block. The T-square starts off as a hardwood guide block (U), see Fig. 8. To keep the T-square aligned, a narrow groove in the guide block fits over the exposed leg of the aluminum channel, see Fig. 8a. The goal here is to get the guide block to slide smoothly without any "play." I cut a single kerf and waxed the aluminum to get the guide block to glide smoothly on the channel. blade. The next step is to add an L-shaped blade, see Fig. 8. It serves as the straightedge of the •T-square. The blade is a piece of V4" Plexiglas that's cut and routed to shape, refer to page 15. Note: The orange Plexiglas we used makes it easier to see pencil lines underneath. We purchased ours from a local plastic manufacturing company. attach blade. Now it's just a matter of attaching the blade to the guide block. It's held in place with two metal pins and a screw. The pins ensure that the blade remains square to the guide block. And the screw keeps the blade from coming off the pins. holders & cover. Finally, I made several holders for my drafting tools, see photos below. And I added a vinyl cover to the table to create a smooth drawing surface, see margin.& Tool Holders A The plastic back of a brush rests in a rabbeted block that's screwed to the back of the case. A An ordinary dowel with a kerf cut in one end provides a simple hanger for a compass. To hold the T-square, the blade is supported at each end by a thick block of hardwood with a kerf in it. A scooped out block acts ► as a pencil tray. Setting the block in from the back lets you slip triangles behind it. PIN (14" x METAL ROD) - #6 x%" Fh WOODSCREW BLADE CA" PLEXIGLAS) W'-DIA. HOLE GUIDE BLOCK NOTE: EPOXY PINS IN GUIDE BLOCK 3/4m-THICK HARDWOOD) CUT'/s"-WIDE KERF TO FIT ALUMINUM CHANNEL LOWER PANEL A Strips of carpet tape are all that's needed to attach the Borco cover to the table. BLADE GUIDE BLOCK ALUMINUM No. 41 ShopNotes 23 |
