Assessments - 3, GPA: 4.3
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Then rotate the key so that the arrow lines up with the LOCK arrow on the cover. This will prevent the safety key from coming loose from vibration when the machine is in use. Figure 30 21 Basic Jointer Operation NOTE: If you are inexperienced at jointing, use scrap pieces of lumber to check settings and get the feel of operations before attempting regular work. This section briefly discusses general rules as well as some of the basic cuts using a jointer, such as surfacing, edging, beveling, skewing, rabbeting and taper cuts. Always use cutterhead guard (except during rabbeting) and keep hands away from cutterhead. Jointing Short or Thin Work When jointing short or thin pieces, use a push pad or push block to eliminate all danger to the hands. Two push blocks are included with your jointer. Many users make their own push blocks from scrap material to suit the particular job at hand. Three examples are shown in Figure 31. Direction of Grain Avoid feeding work into the jointer against the grain. This will result in chipped and splintered edges (Figure 32). Feed with the grain to obtain a smooth surface (Figure 33). Hand Placement At the start of the cut, the left hand holds the work firmly against the infeed table and fence while the right hand pushes the work toward the knives. After the cut is under way, the new surface rests firmly on the outfeed table. The left hand should press down on this part, at the same time maintaining flat contact with the fence. The right hand presses the work forward and before the right hand reaches the cutterhead it is moved to the work on the outfeed table. Follow the 3 inch rule. Never pass hands directly over the cutterhead. Surfacing Jointing the face of stock, or surfacing, is shown in Figure 34. The use of push blocks or pads will help ensure against the operator's hands coming into contact with the cutterhead in the event of a kickback, or as the trailing end of the board passes over the cutterhead. Adjust the infeed table for depth of cut. Cuts of approximately 1/16" at a time are recommended, as this allows better control over the material being surfaced. More passes can then be made to reach the desired depth. Figure 31 User-made pushblocks Figure 32 Figure 33 22 IMPORTANT: When stock is longer than twice the length of the infeed and outfeed tables, an assistant or support table must be used to support the stock. Always use a hold down orpush block when surfacing short stock or stock less than 3 inches thick. Jointing Warped Surfaces If the wood to be jointed is dished or warped, take light cuts until the surface is flat. Avoid forcing such material down against the table; excessive pressure will spring it while passing the knives, and it will simply spring back and remain curved after the cut is completed. Edge Jointing This is the most common operation for the jointer. Set guide fence square with the table. Depth of cut should be the minimum required to obtain a straight edge. Do not make cuts deeper than 1/8" in a single pass. Hold the best face of the piece firmly against the fence throughout the feed. See Figure 35. When edging stock wider than 3 inches, lap the fingers over the top of the wood, extending them back over the fence so that the fence casting will act as a stop for the hands in the event of a kickback. Beveling Never make cuts deeper than 1/16 inch when beveling. Make certain material being beveled is over 12 inches long, more than 1/4" thick and 1" wide. Although the fence may be tilted in or out for a bevel cut, It is recommended for safety reasons that the fence be tilted in toward the operator, making a cradled cut. Set fence to desired angle. For stock wider than 3", hold with the fingers close together near the top of the stock, lapping over the board and extending over the fence. When beveling material less than 3" wide, use beveled push blocks. Figure 34 Figure 35 23 Skewing (Shear Cutting) When edging or facing burl or birds-eye maple, it is not unusual to deface or mar the surface being finished. This is caused by the cutterhead knives occasionally cutting against the grain. In order to prevent the defacing or marring of this type wood, it is necessary to skew, or angle finish, the material being worked. Refer to Figure 36. 1. Release the fence locking handle (A, Figure 36) and remove the hex nut and washer (B) holding the fence to the fence support. Remove the fence assembly. 2. Remove the key (C) and the 1/4”-20 x 1/4” socket head cap screw (D) from the fence support. (The socket head screw keeps the non-mar insert from hitting the key.) 3. Position the fence assembly at the desired angle across the cutterhead. 4. Secure the fence to the support with the hex nut and washer (B), then tighten the fence locking handle (A). When resuming work with normal stock, always re-install the key and the socket head cap screw! Taper Cuts A useful jointer operation is cutting an edge to a taper. The method can be used on a wide variety of work. Tapered...
Este manual também é adequado para os modelos :marceneiro Placa - 60C (2.83 mb)