Woodworker's Journal 2009-33-1, страница 16
ARE YOU READY FOR THIS? Doctor. The Drill Bit Sharpener Check all that apply: kQ I have a collection of old dull drill bits I just can't throw away. I'd rather spend my money on new tools than on buying more drill bits. I know I should sharpen my drill bits, but I don't have time to become a sharpening expert. I want to drill clean, precise holes every time. I'm tired of searching through all of my used bits trying to find one sharp enough to use. If you checked any of these, you're ready to sharpen your drill bits with Drill Doctor, THE Drill Bit Sharpener. See it in action online at 1-888-MYDRILL (693-7455) Look for the Drill Doctor at Sears, The Home Depot, Lowes, Northern Tool, Amazon.com, and wherever you buy your tools. Festool: Amps or Watts? Your otherwise good article on random orbit sanders ["Random Orbit Sanders," August 2008] has a comparison chart in which you list watts used by Festool models under the amps columns. For every other model you provide the amp rating. What are Festool's amp ratings? Peter Carlsen St. Paul, Minnesota Editor's Response: Festool's ETS 125 EQ is rated at 1.67 amps and their RO 125 FEQ at 4.2 amps. Remember the formula: watts over voltage equals amps. Sing a Song of Saw Blades I have a comment on the answer in the October 2008 "Questions & Answers" concerning "singing" saw blades. I own a picture frame manufacturing company, and we run 12"-diameter saw blades on three double miter saws for up to eight hours each day. Several years ago, we had some singing blades. After consulting with the manufacturer, we were told to melt some paraffin (candle) wax and fill the small slots that are relief cut into the steel blade. After using that method for several years, we have never again been bothered by that shrill singing noise. Don Nanney Norcross, Georgia Although it is [a saw blade] that is singing, I'll bet the problem lies elsewhere. Probably a motor bearing. The blade is only acting like a diaphragm on a speaker, amplifying the vibration. Letters There is a simple way to verify this. Run the saw for a few minutes. Then, after unplugging, grab the end bells on the motor and check to see if one is hotter than the other. They should both be room temp. You could buy a new motor, but one drop of oil in the correct spot is a lot cheaper. Take off the end bell, being careful of any shims that may be present, and visually inspect the shaft and bushing. If it is a ball bearing, it is probably sealed and therefore should be replaced. Very gently polish the shaft and bushing with 0000 steel wool, then apply a drop of oil before reassembly. There is probably a felt pad in there around the bushing, and this should, of course, be oiled also. 16 February 2009 Woodworker's Journal |
