Читать книгу Scroll Saw Wooden Bowls, Revised & Expanded Edition - Carole Rothman - Страница 27

Cutting the outermost line of the bowl is easy—you enter the cut from the edge of the blank, then follow the pattern around until you reach your starting point. However, once that cut is made, a blade entry hole must be drilled on the next cut line so you can insert the blade and complete the ring. The angle at which this hole is drilled is usually the same as for the first cut and will be clearly specified in the instructions. The easiest way to drill the hole is with a rotary tool and shop-made angle guide. For best results, use the smallest bit that will accommodate your blade, no larger than a #54 or #56 wire size. Avoid drilling back-to-back holes on the same ring by alternating sides on successive rings, and don’t be tempted to cut into the ring instead of drilling the blade entry hole. Even if you cut with the grain, vertical lines that cannot be sanded away will be left on the sides of the ring.

Making and using an angle guide

Cut a scrap of ¾" (19mm)-thick hardwood into a rectangle measuring about 2" x 1½" (51mm x 38mm). Cut one side to the desired angle and mark this angle on top for future reference. To use the guide, mark the entry hole on the pattern with an awl. Place the edge of the guide at the hole, angled edge toward the center of the bowl blank. Place the drill bit along the guide and drill through the blank. If the bit is too short to go all of the way through with the guide in place, slide the guide out of the way to complete the hole.

Having an assortment of angle guides on hand makes it easy to drill a hole at the proper angle.