Woodworker's Journal 1985-9-5, страница 27
experienced in electrical work, have a licensed electrician do it fur you. Identify The Vacuum Tuhe Connection: Once again, look your salvaged compressor over. You should find three copper tubes extending from the compressor housing. One tube will have its end crimped shut and solder-sealed. The two other lubes are, respectively, the vacuum suction and the exhaust. By plugging the unit in. turning it on, and placing your finger over the two tubes, you should be able to quickly determine which tube is sucking air in—that's your vacuum. Once you've identified the suction tube, mount the compressor to a board or within a box, so that once you've got it set up for operation, it doesn't have a tendency to "walk" or move around. Connecting to the Compressor Finally, run a vinyl or nylon vacuum line from the brass tubing extending out from the handwheel (Photo 4) down to the vacuum suction tube on the compressor. You'll need a fairly thick-walled vinyl or nylon tubing to serve as your vacuum line (thick enough so you can't press the tubing closed with your fingers). Don't use a thin-wallcd tubing, since the vacuum will collapse it. A combination of couplers may be needed to attach the vacuum line to the brass tubing on the handwheel. and lo the compressor. Hose clamps and Teflon tape also come in handy here. However, with a little luck, you should be able lo find a plastic tubing thai just slides neatly over the brass lubing, w ithout .iny additional mechanical connection needed. A little Vaseline 011 ihe connections always helps provide a lighter seal. With your vacuum line in place, test that the handwheel/spindle rotates freely around the vacuum tubing. Turn the handwheel by hand. The weight of the tubing feeding down to ihe compressor should supply enough resistance so the lubing feeding through the handwheel doesn't also turn. Now turn the lathe on to check thai everything is still stable with the lalhe up to speed. As a final test, with the lathe turned off. turn on the compressor and check ihe system for vacuum leaks. Use Teflon Seplcmher/Oclobcr 1V42 Photo 4 tape to eliminate leaks on threaded parts. The mechanical part of your vacuum system is now complete. Vacuum Chucks As shown in Fig. 1. on ihe inboard side of the headstock, you'll need 10 mount a chuck to hold ihe workpiece, employing the vacuum lhat you've fed from the compressor and (hrough the handwheel and spindle. Although you'll need lo make a separate chuck for each different project lhat you intend to make (unless two or more items share the same rough diameter or vacuum clamping recess), the principles used in making the chucks are similar. Since two of our three projects (the trivets and pocket mirrors) share the same recess diameter, we only need two different chucks 10 make them. All vacuum chucks are basically just blocks of wrxxl. mounted to a faceplate, drilled ihrough for the vacuum feeder airway, and dished to a concave recess on the end. so the vacuum suction is spread over a maximum area of the workpiece. The faceplate is mounted 10 ihe chuck with sheet metal screws, like ihosc used to mount the 6 in. faceplate lo ihe handwheel and. like that assembly, a generous layer of Vaseline on the area where the parts meet insures a leak-free vacuum. As with the handwheel faceplate. a rubber flat washer between the faceplate and spindle nut also helps prevent vacuum leaks. Once you've sized the chuck to fit your workpiece. drilled through it for the vacuum airway, and turned ihe concave recess on the end. you'll need to find a way 10 insure lhal there's no leakage with ihe workpiece on the chuck. Since the only thing that's holding the work- Performax Precision Drum Sanders So Here Goes: It really is rigid. It really does sand 44 wide in two passes. It really is precise. It realty is affordable. It realty does have new and really improved abrasive fasteners. It is a high quality product made in the U ,S .A. It realty is the best drum sander money can buy. It really will exceed your expectations. Performax Products, Inc. '1991 Outstanding Small Business of the Year _Burnsville, MN_ Value Plus Performance At Discount Prices 15" Planer With Stand • large capacity (tun 15") with motor below (or stability. ■ Corrugated rnfeed & outfeed gear-driven rollers (or easy feeding • Double rollers on top (or returning slock • Adjustable power feed control dutch lever starts & stops teed instantly without stopping motor • Two speed feed rale of 16.5 & 20 FPW ■ 3 HP motor. 230 volt single phase for heavy duty. • Triple cutler head delivers 13.500 cuts/minute • Handles 195* ol stock per min, • Wilh dust hood
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