AC Spark Plug Tip of the Month Contest

"Tip Of The Month Contest. Hole Aligning Made Easy. Photos by the author. This month's award goes to Harry A. Scott of Ingle- wood, Calif., for a simple tip ...
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AC Spark Plug's . . . "Tip Of The Month Contest Hole Aligning Made Easy Photos by the author his month's award goes to Harry A. Scott of Inglewood, Calif., for a simple tip which should help im-

T prove workmanship with more precisely aligned parts. "To obtain drilled holes perpendicular to the surface of a part, one must align the drill press table normal to the cutting tool. This insures holes that can mount matching parts on opposite surfaces such as the wing attach fittings shown in Fig. 1."

Fig. 2

Spark Plug aircraft engine spark plugs or an AC recording tach-hour meter.

Share your pet short cut or tip usable in designing or building an amateur built aircraft and take advantage of the opportunity to treat yourself to one of these fine awards. Fig. 1

"A means to accomplish this is to use a dial indicator. (Can be purchased from either a tool store, hardware, or automotive store). First, locate the drill press table in the position that is going to be used. Then insert the indicator in the chuck adjusting it so as to reach the lever as far out from the center line of the chuck as is practical. Lower the chuck until the indicator lever contacts the table, lock the spindle, and set the dial to read zero. Now, by hand, rotate the chuck to determine the slope of the surface of the table. Make corrections by slightly tapping the table with a mallet. These steps are all illustrated in Fig. 2.

"This procedure will result in good aircraftmanship and the accompanying personal gratification."

NO SMOKING WITHIN SO FEET

OF

Each month the outstanding tip is selected from those

sent in. The winner may select an award of a set of AC SPORT AVIATION

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