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Q&A: Router fence spacers – FineWoodworking


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Rout from the inside out. When routing a groove that’s wider than the bit, start with a spacer behind the fence when making the first pass. Then remove it to cut the outer portion of the groove.

Tamar Hannah’s Adjustable Router-Table Fence (FWW #292) is interesting and could be a serious time-saver. However, her comment “If you add spacers between passes, you risk a dangerous climb cut, which could yank the workpiece out of your hands and your fingers toward the spinning bit,” doesn’t get that adding a spacer after a pass actually puts the spinning bit deeper under the fence such that there would be no contact. Also the concept that a climb cut is caused not by taking too deep a cut, but by wrongly feeding the work left to right, seems to have been missed.

—Wayne Richard, Seneca, S.C.

Michael Pekovich responds: Sorry for the confusion. You are absolutely correct that the spacers limit the depth of cut when routing a profile along the edge of a board. The advice given here was specific to routing a wide groove in the center of a board. In that case, it is very important that you begin the cut with spacers in place, so that, as you remove them, the bit is cutting the wall farther from the fence as you feed the stock left to right. Should you happen to add a spacer after the first cut, the bit would be cutting along the inside wall of the groove, creating a climb cut since the bit is spinning in the same direction as the feed direction, which is dangerous.

From Fine Woodworking #293

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