TM 9-243TYPES AND USESTHICKNESS (FEELER) GAGESThickness (feeler) gages are made in many shapes andsizes; usually 2 to 26 blades are grouped into one tooland graduated in thousandths of an inch.Most thickness blades are straight, while others are bentat the end at 45 degree and 90 degree angles. Somethickness gages are grouped so that there are severalshort and several long blades together. Thicknessgages are also available in single blades and in stripform for specific measurements. For convenience,many groups of thickness gages are equipped with alocking screw in the case that locks the blade to be usedin the extended position.These gages are fixed in leaf form, which permits thechecking and measuring of small openings such ascontact points, narrow slots, and so forth. They arewidely used to check the flatness of parts in straighten-ing and grinding operations and in squaring objects witha try square.CENTER GAGEThe center gage is graduated in 14ths, 20ths, 24ths, and32nds of an inch. The back of the center gage has atable giving the double depth of thread in thousandths ofan inch for each pitch. This information is useful indetermining the size of tap drills. Sixty-degree angles inthe shape of the gage are used for checking Unified andAmerican threads as well as for older American Nationalor U.S. Standard threads and for checking thread cut-ting tools.16-2
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