Page 72 Power Equipment Usage Manual (Rev. 5/10)
the speed and the larger the bit, the slower the motor speed. (NOTE: The 22” General International’s
cover is screwed shut and cannot be changed)
The workpiece should never be held only by hand; always use hold-downs or clamps to secure the
workpiece. When you need to drill a hole in a round piece of stock such as a turned leg or dowel, use a
v-shaped jig to hold the stock in place while drilling. Clamping your workpiece to your drill press table
will also allow you to drill an offset hole.
Take care to use clean, sharp bits. Damaged or broken bits could result in serious injury. When drilling
flat work, place the workpiece on a wooden base and clamp it down against the table.
When drilling wood, you may need to pull the drill out periodically as the drill bit will probably clog. By
pulling the drill bit partially out of the work while the bit is
turning, it will self clean. If the drill bit does clog (usually from
pressing too hard and too fast), then pull the bit out, turn
machine off, wait until bit stops and then clean the clog out with
a hard material such as a screwdriver or nail.
When you need to drill holes in the same spot on a number of
pieces of stock, clamp a fence with a stop block in position on the
table of the drill press. Then you can place each piece of stock
against the stop block and drill the hole.
14.2.3. Methods for Preventing Tear Out
When drilling large-diameter holes with a spade (or paddle bit), hole saw or other large diameter bit,
one of the most common problems occurs when the bit "blows through" the back side of the stock,
tearing the face of the stock, leaving a very ugly problem to deal with. However, there are two very
simple methods for solving this troublesome issue:
• Clamp a block of hardwood to the back side of the stock before drilling. When the bit
approaches the end of the cut, it will be far less likely to blow through with another piece of
wood to drill. However, if the stock placed on the back side is softer than the workpiece, or if it
is not securely clamped to the workpiece, tear out can still occur.
• Another, perhaps simpler method is to drill half-way through the stock, until the pilot hole just
penetrates the back side of the workpiece, then flip the workpiece over and drill back toward
the front side. In this manner, any possible blowout would occur in the middle of the stock as
opposed to either edge, leaving a much cleaner cut on each side.
(30 pages)
(104 pages)
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