Woodworker's Journal 1984-8-2, страница 21
An examination of a log cross-section (Fig. 3) shows that plainsawn boards are cut at a tangent to the growth rings, while quartersawn boards are cut radially or perpendicular to the rings. Thus a plainsawn board will have heartwood along the face while a quartersawn board will have the heartwood along one edge. In Figs. 1 and 2, the heartwood is indicated by a grey tone. Obviously, the validity of each method depends mainly on how the boards were cut from the log. From a realistic point of view, the novice may have difficulty in determining just how the boards are cut, especially since rough cut ends may all but obscure the grain. Probably the most practical approach then is to forget about how the boards were cut and simply arrange them so the face grain patterns present the most pleasing appearance. A light pass with a plane will show in which direction the grain runs on each board. If the boards can be arranged so that the grain directions are all the same, final planing of the glued-up slab will be much easier but this is not essential. After deciding how the boards will be arranged, they should be clearly marked with numbers or letters on their face sides so the order does not get mixed up in the jointing operations. Incidentally, in cases such as for a drawing board, where it is important that the slab be as flat as possible, it's best to use many narrow boards rather than a few wide ones. There will be more jointing work but a true surface will be easier to obtain. Jointing the board edges consists of planing or machining them so that they will fit together as closely as possible along their entire length. This is one function of a stationary power tool called, appropriately enough, a jointer. When adjusted properly, it performs the job quickly and accurately but the hand plane leaves a superior surface for gluing. Every woodworker should develop the skill to joint boards with a hand plane. It's not easy to plane the edge of a long board straight, while keeping that edge truly square to the board face. It requires a perfectly tuned plane and subtle muscular coordination; a combination that comes only after considerable experience. One way to make the operation a bit less demanding is to clamp the joining boards together in the vise with their edges continued on page 22 30-DAY FREE TRIAL! Send for complete facts on how you can try this versatile saw without risk! Easy Terms. rail Toll-Free 1(800) 824-7888 Oper. 642 Woodrnaster Power Tools Dept. S011 2849 Terrace Kansas City. MO 64108 □ YES! Please rush me, free and without obligation. your Complete Information Kit on the new 24W" MODEL 500 BAND SAW plus facts on Wood master's 30-Day FREE TRIAL Money-Back Guarantee. Name ________— Address ______ City_______—- State _____— Zip____ WATCO STAe (htptnai ««</ S'tM (At .j^W/ DANISH OIL WOOD FINISH -IKE MAGIC One easy application seals, >rimes, finishes, hardens, protects and beauti-ies. True, long-lasting elegance. 3AVE MONEY Doing your own wood fin-shing is a big money saver and with Watco, anyone can finish wood like an expert! :or complete information, (ill in and mail the coupon today. J WATCO-DENNIS CORP., 1756-22nd St. Santa Monica, Ca. 90404, Dept. WJ-34 □ Send free booklet "How to Beautifully Finish Wood." Name Slrset City _ State -Zip rJ Request this brochure... discover North America's best Precision Saw value J. PHILIP HUMFREY Call collect to order (416) 293-8624. S1285. US. Shipped freight collect, no other charges. Use your Excalibur 24 for 4 weeks. If it's not erything we say it simply return it a full refund luding shipping iiarges. r i i Humfrey's Pre-Inspection assures you that every Excalibur 24 Precision Saw is in perfect working order before it leaves our door. J.Philip Humfrey Ltd. [ SMI Kennedy Road, Unit 7, Dept. 0 3/4, Scarborough, Ontario. Canada. M1V 2)9. Tel; (416) 293-8624 □ Please rush me your free folder on the Excalibur 24 Precision Saw. Name _ Address. City_ _ State. _2p_ I I I I I I I i J At last, a pro-size, band saw priccd for the home shop! Big 241/i-m. throat easily handles large scrollwork, complex curves. 4x8 sheets. 9-in. vertical cut makes it easy to resaw valuable hardwoods. Ball bearing construction, all-steel welded frame to eliminate deflection. Can be ordered complete with motor, stand, dust collector, rip fence, scroll saw table. Full instructions. NEW! 241/2-in, 3-SPEED BAND SAW 30-Day Free Trial |
