Popular Woodworking 2005-12 № 152, страница 16
Letters continued from page 12 breaker fried, it appears that's where the fault actually lay. — Bruce D. Wedlock, author Wiring May be Efficient, but is it Safe? Since my electrical experience derives from hooking up my 60-year-old Lionel train set, I hesitate to challenge folks with credentials like Bruce Wedlock. Yet it appears to me there is a potentially lethal circuit error in "Efficient Shop Wiring" (October 2005). In the sidebar "Easy Automatic Dust Control," both the text and the schematic specify a SPST switch to shunt a similarly configured switch in the Automater to control a 220v dust collector. With both switches open, one leg of the 220v circuit is still energized and presents a dangerous 120v current path from it to the frame of the grounded device. It appears to me that the Automater should only be used to control 120v devices with a grounded neutral or to control a DPDT relay to switch a 220v load. Daniel Freeman Greeneville, Tennessee Your suggestion of adding a DPDT relay to control a 220v load is sound. I recommend it. — Bruce D. Wedlock, author Silicone-based Products Beat WD-40 I was very surprised to read your response in "Removing Rust from Tools" (August 2005). WD-40 has a base similar to DOT 3 brake fluid, which absorbs water from the air, causing brake systems to rust. I recommend oil, wax or 100 percent silicone products for treating metal and tools. Eric D. Birch Binghampton, New York WD-40 has its fans and detractors, but we have found it to be a good rust-preventative in our shop at Popular Woodworking. Sili-cone-based products are prized for their rust-preventive properties, but they should be used cautiously in the woodshop. Silicone contamination of your wood can cause finishing problems, such as fisheye, with film finishes. PW —Christopher Schwarz, editor CLARIFICATION In "Build an Oil Wicke" (October 2005) we state that raw linseed oil is OK for the wicke. Although raw linseed oil cures much more slowly than boiled linseed oil, the raw oil is still labeled as a fire hazard (though we have not been able to determine the true risk). To be on the safe side, we recommend you use the other oil mentioned in the article for your wicke: mineral oil. WRITE TO US Popular Woodworking welcomes letters from readers with comments about the magazine or woodworking in general. We try to respond to all correspondence. Published letters may be edited for length or style. All letters become the property of Popular Woodworking. How to send your letter: • E-mail: popwood@fwpubs.com • Fax: 513-891-7196 • Mail carrier: Letters • Popular Woodworking 4700 E. Galbraith Road Cincinnati, OH 45236 HICKORY RED DAK WALNUT • We deliver hard to find hardwood plywood and veneer straight to your door. • Choose from the above 6 standard species in a variety of cores and thicknesses. • Other species available upon request. PCIAOPlU 1-800-968-4250 • pw.panoplycorp.com corporation! w ' ' ' ' ' NEW ROUTER LIFT □ IGITRLt Perfectly Engineered for Precision Performance Patent Pending Belts Pulleys Chains Sprockets Now you can make precise adjustments to your router with confidence! Again Jointech finds itself first in developing the ONLY Lift System for your router with built-in Digital Display. This means that you can make perfect router bit height settings with ease. From the makers of the most precision fences for routing, joint making, mitering and table saws... we bring to you - SmartLift Digital-;. Experience why so many woodworkers are making the change to digital. CALL NOW FOR OUR FREE CATALOG 1-800-619-1288 Vist our website at: www.jointech.com n Woodworking Tools CIRCLE NO. 130 ON FREE INFORMATION CARD. |
