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Power SuppliesWelding power supplies take alternating or direct current from a power line or portable generator and convert it to current usable at the welding arc:, Check National Electrical Manufacturers Association (NEMA) Standards Publication EW1, Electric Arc Welding Power Supplies, and manufacturers'' literature for construction and performance requirements of individual machines.Among types of power supplies, alternating-current (ac) transformers are least costly-most use 230 V single phase input power. Direct-current (DC) transformer-rectifiers convert AC to DC, using single- or three-phase power to produce constant voltage (cv) or variable voltage (vv). AC-DC transformer-rectifiers can AC and DC weld.

* Don''t spray windows. The high pressure can break them.Better cleaning with detergentsDetergents (about $6 to $14 a gallon) and accessory brushes increase cleaning effectiveness while reducing cleaning time. When renting or buying a pressure washer, inquire what accessories and detergents are available for it. To prevent damage to the internal parts, never run bleach in the machine or use detergents not designated for use in pressure washers.Detergents can only be run through pressure washers using a wide spray pattern. In addition, electric pressure washers require a low-pressure setting on the spray wand. Follow your machine''s instructions for using detergents, diluting the detergent and (if necessary) hooking up a chemical injector (Photo 1). For the best cleaning results, first loosen the dirt with plain water under high pressure using a medium spray pattern. Next, apply the detergent using a wide nozzle setting and let the detergent sit a few minutes to penetrate the dirt. Keep the surface wet to avoid possible discoloration or damage y the detergent. Finish by resetting the nozzle to a medium pattern (or changing the nozzle) and rinsing with plain water. Switch detergents by draining the first detergent from the pressure washer, rinsing the system with plain water and introducing the next detergent.

The smallest, brad nailers which shoot brads up to 1-1/4 in. long, often sell for well under $100. You might be better off buying one.Roofing nailerCOST: $50 per day with compressorBENEFITS: Easy as pulling a trigger and faster than a platoon of hammer-swingers.Driving thousands of roofing nails with a hammer is like scrubbing the floor at Grand Central Station with a toothbrush. Don''t put asphalt shingles on anything bigger than a doghouse without a roofing nailer. For wood shingles, speed up the job with a roofing stapler.