Woodworker's Journal 2008-32-5, страница 69
On low-end squares, the lock bolt rotates freely in its bore once the blade is removed. When you reinsert the blade, you have to visually align it — which makes the process balky. A protractor head enables you to lay out lines at precise angles. Two styles are available. The reversible head has ground reference faces on both sides of the blade, while the nonreversible has this shoulder on one side. Both heads are cast-iron. The center head is a feature that is most commonly found on more expensive and higher quality combination squares. Either protractor head is fully adjustable with a revolving turret graduated from 0° to 180° in both directions. Either can be positioned anywhere along the blade. Consider the blade next. A premium blade, first of all, is slightly thicker (3/32" vs. 5/64" for blades in other categories) and thus stiffer. It's machined from bar stock, hardened and tempered. The graduations are first cut with a CNC machine, then acid-etched to enhance their definition. After it's ground to final length, the blade is chromed (or satin-chromed), and the graduation marks are darkened. You do have a choice of blade finish, as I mentioned. The standard finish, which is what I've got and am content with, is polished chrome. But the matte-like satin- chrome finish is non-glaring and easier to read. Had I realized, at the time I bought my Starrett, that this finish was available, I would have chosen it, even at a higher price. Premium blades are made in several standard graduation schemes. The 4R graduation is probably most useful for woodworking, having 8ths and 16ths on one side, 32nds and 64ths on the other. The 16R graduation has 32nds and 64ths on one side, 50ths and lOOths on the other. Metric has mm and ,5mm on both Today's Shop continues on page 70... (Circle No. 93 on PRODUCT INFORMATION form) Woodworker's Journal October 2008 Here's what makes the DR® POWER GRADER the fastest, easiest, and simply the best do-it-yourself road-grooming solution ever — PATENTED DESIGN enables you to loosen and regrade enormous amounts of materials with minimal power. POWERED ACTUATOR allows you to control grading depth from your towing vehicle with a remote control. CARBIDE-TIPPED SCARIFYING TEETH loosen the hardest composite surfaces. FILLS IN POTHOLES and wash outs, and smoothes washboard on gravel, limestone, dirt, or sand roads without hauling in new material, shoveling, or raking. Get a FREE DVD and Catalog with full specs, prices, and our 6-Month Risk-Free Trial guarantee! ^elEl 888-206-0173
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