Popular Woodworking 2004-02 № 139, страница 52
TIPS & TRICKS
Tilting Pieces to Create Stopped Cuts
Bit locations marked on fence
Stopped grooves or dados can be made safely on the router table by first marking the bit location (both sides of the bit profile) on the fence, then carefully lowering and raising the piece for the cut using the end of the board opposite the cut as a fulcrum.
No Templates Needed If You Copy an Existing Piece
To reproduce a shape quickly and precisely without making a template, just use an existing part to make copies. Adhere the shaped part to the stock with double-faced carpet tape and, using either a pattern-cutting or flush-trim bit, cut the stock while tracing the shaped part with the bearing. However, because the bit won't cut inside corners that are smaller than the bit diameter, you'll have to cut this with a band saw or scroll saw.
Mortising Bits are Worth Taking the Plunge For
Some manufacturers offer so-called mortising bits. They look like a standard straight bit with one difference: They have an additional small cutter at the end of the bit. This bit allows you to plunge directly into your work, instead of wiggling the bit as you plunge, which is typical with a straight bit.
Rabbets, Dados & Grooves
You can make the most basic woodworking joints - rabbets, dados and grooves -using a simple fixed-base router and an inexpensive set of straight bits.
Rabbets (and the simple tongue for a tongue-and-groove joint) are produced easily with a router. While you may need a variety of rabbet sizes, a single rabbeting bit can accomplish them all. By purchasing a rabbeting bit with interchangeable guide bearings, the width of the rabbet can be changed quickly by selecting and installing a different diameter guide-bearing on the bit.
Rabbeting can be accomplished safely using a router free-hand or in a table. For rabbeting smaller pieces (such as with frames or door mullions) I recommend using a router table. In a table, you can use a simple straight bit to cut the rabbet, or you can use a rabbeting bit with a bearing guide. Even though you may think the bearing guides make a fence
unnecessary, you still should use one to limit the amount of bit exposed and to help guide the pieces. Align the fence with the outside edge of the bearing for a seamless process. For improved accuracy and safety, use a fingerboard to hold the material against the fence and table.
As mentioned earlier, a rabbet also can form the tongue for a tongue-and-groove joint. The tongue can be flush to one side of a board (for offset raised-panel doors) or the tongue can be centered on the board. Essentially, the tongue is just a long tenon. Run the groove first, then simply size the tongue to fit in that groove.
Many dados or grooves can be made with a straight bit that is sized to accurately make the joint with a single-width pass. To make a dado or groove that's a non-standard size, choose a cutter that's slightly smaller than the width of the joint and cut the joint in two passes, as shown in the photos below.
When routing dados and grooves, the joint ordinarily will be the same width as the bit. If you need to make a joint of a larger size, first make a cut that's somewhat narrower than the joint needed (left), then move the fence or straightedge to make a second cut (below), enlarging the joint to the desired width.