Jointer Fundamentals Working on the Straight and True by Paul Anthony
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Jointer Fundamentals Working on the straight and true By Paul Anthony The jointer belongs to the in a way that speeds up your cut by knives that are set at top trinity of stock-dressing machines woodworking while ensuring dead center to the height of that also includes the tablesaw accuracy and quality of cut. the outfeed table, as shown in and thickness planer. Of those, it’s Before we get started, Figure 1. The outfeed table probably the most misunderstood. it’s important to note that a supports the cut surface as Although its job is simple– jointer–more so than most other the remainder of the board machines–must be precisely is jointed. This is why it’s so stock–the tool frustrates many tuned to work properly. If you’ve important that the tables are woodworkersstraightening andbecause flattening jointing been experiencing snipe or parallel to each other. If they’re consistent problems getting not, or if the knives are set However, when set up and used too high or low, a straight cut properly,requires aa certainjointer willfinesse. do its job check out my “Jointer Tune-up” won’t result. To eliminate or articlestraight in edges issue and#28 faces, or online first minimize tear-out, orient the that no other machine can. at woodcraftmagazine.com. workpiece so the knives rotate preciselyI’ll show and you efficiently how to put in athis way With a jointer, a workpiece in the same direction as the remarkable machine to work fed across the infeed table is slope of the grain, as shown. 40 woodcraftmagazine.com June/July 2012 Planning the cut Before making a cut, you’ll need What It Will And Won’t Do to decide how to best orient the The bulk of a jointer’s chores involves edge-jointing and face- piece for feeding and how deep jointing, which I’ll address in this article. It can also cut chamfers, a cut to make. How you orient rabbets, bevels, and tapers, but those are tricks for another time. a board depends on its warp It’s important to note that a jointer cannot be expected to mill (Figure 2) and the slope of its a board to consistent thickness. That’s a job for the thickness grain. For stability when feeding, planer. Although the jointer can remove wood from both faces place the concave face or edge in turn, the result is almost certain to be a tapered board. against the jointer tables. When face-jointing, this means you should orient the cup or bow Figure 1: How a jointer works downward. When edge-jointing, the crook should be at the Workpiece bottom. That way, the board will ride on its high spots, providing Knives at top dead Feed better footing. Conversely, if center are level you try to feed with the convex with outfeed table Depth side downward, the board will of cut n o Begin by sighting down the ti Outfeed a Infeed table t rock, making control difficult. table o (adjusts for edge of a board (Photo A.) This R depth of cut) will clearly reveal any bow or crook at the same time. (If a Cutter board has an extreme crook, head way you would rip away a live edge,saw it as away shown first, in in Photo the same B.) Cup Figure 2: Types of Warp is generally evident at a glance, but you can sight across the end of the board to be sure. Bow Crook Cup Twist A Sight the edge of a board against a contrasting background for better visibility. This board has a slight crook. Photos: Paul Anthony; Illustrations: Patrick Welsh June/July 2012 woodcraftmagazine.com 41 A shoe-style plywood pushstick Jointer keeps your fingers Safety out of harm’s way when edge-jointing narrow pieces. • Always use a properly operating cutterhead guard. • Use a pushstick and/ or pushblock, and keep your hands a safe distance from the cutterhead. • Don’t joint pieces shorter than about 12". For face-jointing, • Don’t overreach use a long pushblock when jointing outfitted with an long boards. attached heel and • Always wear eye a handle shaped and ear protection. like a plane tote. After determining which edge or face gets Tip Alert fed downward, orient the board so the knives Before jointing multiple boards, assess each one, will rotate with the direction of the grain slope and then group all of them in feed orientation (Figure 1) instead of against it, which can cause next to the jointer. You can then turn on the tear-out. Of course, grain often doesn’t run neatly machine and work without pause. in one direction only. If it reverses, just favor the direction that cuts mostly with the slope. Finally, set the jointer for an appropriate depth of cut. If you don’t have to remove a lot of material, take lighter cuts to avoid wasting stock or overcutting the piece. However, if you’re jointing rough-sawn and/or badly warped boards, you’ll work faster with a deeper cut. For general use, I leave my machine 1 set for a 32"-deep cut, which is just about right for removing⁄ saw marks on a ripped edge. For the 1 heaviest milling, I cut about 8" deep per pass. ⁄ General feeding principles Successful jointing depends on the proper body stance, feed pressure, and feed speed. There’s a certain amount of nuance involved, but you should be able to nail it with a bit of practice. When feeding, begin by standing with your B feet splayed for good footing (Photo C). Lay the Before jointing, rip away any live edge or extreme board fully on the infeed table just in front of the crook, guiding the board with a temporarily attached cutterhead guard, pressing the leading end down straightedge bearing against the rip fence. 42 woodcraftmagazine.com June/July 2012 firmly. Push the board forward while maintaining D The scalloped edge is the result of feeding a board much too fast, while the smooth edge indicates an appropriate feed rate. is the cut itself (Photo D). Moving too quickly creates a scalloped surface. On the other hand, moving too slowly won’t normally hurt the surface, but it wastes time. Taking a couple practice passes and then inspecting the resulting surface should tell you what you need to know. Face-jointing C Begin a cut standing with feet splayed. Then move stock. But don’t make the mistake of face-jointing along with the board in sideways half-steps. anFace-jointing entire board is thebefore first crosscutting step in thicknessing it into your smaller project pieces. If you do that, by the time downward pressure at the leading end and forward the entire bow is removed, the board may be too pressure at the trailing end. As you move along with thin at its ends to suit your purposes. Instead, the board, waltz sideways by bringing your right foot against the left; then step widely sideways inches oversized in length, as shown in Figure 3. again. When your belt buckle is about 10" rearward Similarly,first crosscut ripping your cupped project stock pieces to a rough couple width of of the cutterhead, plant yourself there and complete the cut by moving the board forward with your Next, orient each piece as discussed earlier– hands, maintaining downward pressure over both withcan help the flattenconcave stock face beforedown and face-jointing. the grain the infeed and outfeed tables without overreaching. sloping in the direction of the cut. (If necessary Avoid applying excessive downward pressure to read the edge grain, take a quick pass or two when face-jointing thin stock or edge-jointing off the edge.) If cup and bow are on opposite faces, lay each face of the piece on the table gradually remove the high spots in order to bring the in turn, rock it to see which orientation is narrow pieces that flex. The idea of jointing is to more stable, and go with that orientation. When setting your depth of cut, err on the duringsurface feeding. into a flat Instead, plane. pressTherefore, down you just don’t enough want to to shallow side for starters. Then take a test cut. If keeppress the a flexible knives piece from intoslapping full contact the piece with upward. the tables Again, the maximum cut will depend on the width the wood, the width of the piece, and the depth anddesirable, density increase of the workpiece, the depth of but cut I generallyfor efficiency. 1 of Propercut. Your feed best speed gauge depends of the proper on the feeddensity rate of don’t remove more than about 8" at a time. For pieces that aren’t much longer⁄ than your infeed table, hook your heeled pushblock onto the Tip Alert trailing end of the board. Hold down the leading When doing general milling, try to avoid using the end of the board with your left hand (or use a 1 rearmost 1 ⁄2" or so of the knives, preserving that non-heeled pushblock for stock thinner than about 3 “sweet spot” for fine, final edge-jointing. 4"); then feed the board across the cutterhead. ⁄ Repeat as necessaryJune/July 2012until thewo odcraftmagazine.comface is flat. 43 A twisted board can be a problem because it Face-jointing rocks no matter which face is down. The trick is long boards two, after which the board will gain footing. Don’t Step 1 maketo balance the mistake it as best of you holding can fordown the the first leading pass or end of the board to avoid rocking, or you’ll end Handling long boards also requires some nuance,up with aas seriously shown in tapered the photos finished at left.