ELECTROMAGNET Drives VIBRATING JIG SAW (Jul, 1935)

ELECTROMAGNET Drives VIBRATING JIG SAW

ONE of the most useful of all power tools for the home workshop, yet perhaps the easiest to make, is the vibrator type electric jig saw. You may use such a saw to cut intricate patterns in wood as thick as 1/2-inch, or as thin as 1/16-inch. The great speed at which the saw travels provides smooth and accurate cuts. With no rotating parts, a jig saw of this type should last indefinitely.

An electro-magnet attracts and releases a metal diaphragm to which is attached a saw blade. A flat steel spring supports and gives necessary tension to the upper end of the saw blade. With the unit adjusted properly, the stroke will be about 5/8-inch.

The speed of this saw depends upon the frequency of the A. C. power used, as the magnet is energized and de-energized twice for each cycle. Thus there will be 120 strokes per second when 60 cycle power is used for the electro-magnet.

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