25 - Special Table Saw Issue, страница 15
Drilling and cutting a mortise in a picture frame for a keyhole hanger can be a time consuming process. So can locating where to mount the screw in the wall for the frame to hang on.
If I'm not concerned about mounting the frame so it's flat against the wall, I take a shortcut by drilling a hole just large enough to fit the slot in the hanger, see Fig. 1. Then I mount
Knobs & Pulls
■ When mounting hardware, the last thing I want to happen is to drill a hole, mount the hardware, and then decide I don't like how it looks. To avoid this, I often car-
and take a step back to see how it looks, see Fig. 1. This way, I can try different pieces of hardware and different positions.
Once I've found what looks
minutes to make a drilling-guide from a piece of Ma-sonite and a scrapwood cleat, see Fig. 2. The guide eliminates tedious layout and helps lo-
pet tape the hardware in place best, I'll often take a few extra cate the holes in the same place.
5elf-Centering Prill Bits
SET SCREW FOR SETTING DEPTH
TAPER CENTERS BIT IN HINGE
■ Before discovering self-centering drill bits, drilling perfectly-lo-catecl pilot holes for hinge screws was hit or miss at best. Sometimes the holes would end up where they should — in the center of the hole machined in the hinge. Other times the bit would catch the grain of the wood and get pulled off center — resulting in a misaligned hinge.
But not anymore. With self-
the hanger over the hole.
To locate the screw in the wall, a wire brad (with the head removed) is nailed in the frame and used to mark the wall, see Fig. 2.
f HOLE DIAMETER EQUALS LENGTH OF
centering bits, pilot holes end up exactly where they should. The reason? The drill bit is housed in an outer case that's tapered at the bottom, see drawing. As the bit is pushed down, the taper of the bit centers it over the hole in the hinge just before it enters the workpiece.
These bits are commonly sold as Vix bits, spring-action bits, or self-centering drill bits.