Woodworker's Journal 2009-33-6, страница 17

even with relatively small-diameter bits. Therefore, Freud incorporates this feature whenever the bit diameter allows, in many cases including bits with diameters as small as 5/8".

— Cliff Paddock

QI like to use a pattern bit on my router when making identical parts. One of my tool catalogs lists over 30 of these bits ranging in size from 1/4" to 1%" in diameter. I can understand different lengths of bits to accommodate various wood thicknesses, but what's the advantage of different bit diameters?

Jim Westbrooks Canal Fulton, Ohio

A The plethora of different pattern-bit diameters is more than a marketing ploy.

I can think of several practical reasons for owning a variety of them. First, small-diameter bits are sometimes your only solution for sneaking into those tight or tiny areas of a template where a bigger bit just can't reach. But, they're no match for making heavy cuts or routing thick workpieces with a long bit. In these situations, larger-diameter bits offer more mass and stiffness as well as a lower exit angle of the cutting flutes.

Those characteristics help reduce chattering and tearout to produce a smoother cut. Whatever pattern bits you choose, look for a shear or spiral geometry when possible. They'll give you a slicing, rather than a chiseling, action, and I've found that they up my odds for a cleaner cut on splintery woods and end grain.

— Chris Marshall

Continues on page 18 with Stumpers ...

WINNER! For

simply sending in his question on pattern bits, Jim Westbrooks of Canal Fulton, Ohio, wins a Steel City Bench Mortiser (Model 25200). Each issue we toss new questions into a hat and draw a winner.

Pattern bits come in a range of diameters to suit everything from tight-quarters work to heavy stock removal.

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Woodworker's Journal December 2009

17