36 - Miter Trimmer, страница 16
PLASTIC WING KNOB Miter • Trimmer 1/4" lock nut CLAMP BLOCK miter trimmer shown above. Along with an ordinary block plane, this jig makes it easy to "true up" the mitered end of a workpiece and produce a perfect fitting joint. how it works. The way this works is simple. The miter trimmer is tightened in a vise. (Or, you can clamp it to a bench, refer to back cover.) Either way, you slip the workpiece into an adjustable throat opening inside the miter trimmer. By adjusting a simple built-in clamp, this throat opening will accept pieces up to 3V2" wide, see photo at left. As you tighten the clamp, the workpiece is pressed against an angled bed, see photo A on next page. This bed orients the workpiece at a 45° angle to a "track" that runs along the top edge of the miter trimmer. By sliding the block plane in this track and across the end of the workpiece, you can slice off a paper thin shaving, see photo B. To create a perfect fitting miter joint, all you need to do is repeat this process for the mating piece. This shop-macle miter trimmer and a block plane make it easy to refine a miter joint for a perfect fit. 1/4" THREADED ROD 1/4" LOCK NUT WASHER J; ust a whisker. Sometimes that's the only difference between a nice, tight-fitting miter joint and one that has a slight gap where the mitered ends meet. Sure, you can readjust the angle of the miter gauge on the table saw and trim the ends again. But the angle may be "off' by such a small amount that even a tiny adjustment is often too much. As a result, you end up with a miter joint that still doesn't fit tight. To avoid all this fussing around, I built the Turning a large ► knob on the end of a built-in clamp lets you adjust the throat opening for workpieces of different widths. #& y. 1!4" Fh SHEET METAL SCREW 16 Shop Notes No. 36 |
