Woodworker's Journal 2010-34-2, страница 62
Shop Test continued Flip-style countersinks are double-ended — drill your pilot hole and countersink, then flip the body around and reattach to the drill to drive the screw Rare animals these days, old-style piloted countersinks were made of flat steel with the ends rolled to form a shank. They got the job done quickly, but the results weren't always very pretty. setscrew or a collet action of the countersink body. The drill bits can either be straight or tapered, their drilling length adjustable simply by loosening the setscrew or collet, sliding the drill bit to the desired length and retightening. Most of these countersinks can be used with a stop collar that sets the depth of the countersink, and most come in sets that include varying sizes of matched countersinks and drill bits to accommodate the screws being used. Nearly every major tool manufacturer that offers drills (as well as a few who don't) produces basic, inexpensive combination countersinks of this type. Many of these are constructed in a "flip" style, with a double-ended cutter. When it's snapped onto the driving body in the countersink mode, you can drill both pilot hole and countersink. Snap the countersink off, flip it around and snap it back in to expose the appropriate driver bit lo set the screw. Three typical examples of high-end countersinks are shown in the photo at right. From left to right are the Rockier Pro Tapered Countersink, the CleanStop countersink from Woodworker's Supply and the Jack Rabbit from Jack Rabbit Tool. Each has some unique features. The Pro Tapered comes in a set of three complete countersink combinations, sized for #6, #8 and #10 screws. The bits are nicely tapered to match the profile of traditional woodworking screws, and each drill bit has a flattened shank for secure locking with the setscrew. A depth stop with two setscrews is included for each bit, and these countersinks have the largest main shank of 3/8". For cutting action, there are two extra-long flutes that extend up the countersink body lo help eject chips through the depth slop. The three-piece set sells for about $60, but each countersink is also sold A7 Here are three typical styles of piloted countersinks. Each can be adjusted to create a pilot hole of exact depth, along with its countersink, simultaneously. The stop collar on each sets the optimal depth for countersink. individually, with #5 and #12 countersinks also available. The CleanStop shares a similar pair of long flutes for chip ejection, but it uses straight drill bits instead of tapered. Four combination countersinks sized for #6, #8, #10 anil #12 screws come in the set, but only two depth stops are included: they must be shared among the four countersinks. The depth stops are unique and feature a two-piece design with a polymer cap attached to the front of the metal stop. The cap spins freely but stops when it contacts the workpiece to help prevent marring or burning the worksurface. The main shank is a 1/4" hex design. The four-piece set sells for about $60, but countersinks are also sold individually. The Jack Rabbit set includes the same four sizes as the CleanStop, but it uses a single body. Each countersink is a separate collet that screws into the driving body, tightening on the drill bit as it's put in place. The business ends spoil four short flutes that do not extend past the depth stop ill typical use. A single brass depth stop is included for the driving body. The Jack Rabbit countersink is a "quick-change" combination, using separate drive shanks sporting both Phillips and square-drive ends. In use, you drill the pilot hole and countersink, then just snap lite driving body off the shank and drive the screws home in a quick one-two action. The set, which includes a pair of wrenches for tightening the collet-style cutters, two double-ended driver shanks and a magnetizing ring for the drivers, sells for about $50. All three sets include a storage case, as well as Allen wrenches. Replacement drill bits are available for all. Other Countersink Styles Although there's not always a lot of call for it in many 64 April 2010 Woodworkers Jourruil |
