. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . iven with a belt from a line shaft and sometimes witha motor fitted in direct connection with the driving power squaring shears the stroke of the crosshead orgate is controlled by means of an automatic positiveclutch. The clutch in the power squaring shears istripped with a slight depression of a foot treadle, andunless the treadle is kept depressed the motion of thecrosshead or gate will
. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . iven with a belt from a line shaft and sometimes witha motor fitted in direct connection with the driving power squaring shears the stroke of the crosshead orgate is controlled by means of an automatic positiveclutch. The clutch in the power squaring shears istripped with a slight depression of a foot treadle, andunless the treadle is kept depressed the motion of thecrosshead or gate will stop automatically at its highest 22 SHEET METAL WORKING MACHINERY 23 point after making one cut, without any stoppage of theflywheel. Foot Power Squaring Shears.—When using the footpower squaring shears it is the usual practice to insertthe material between the cutting blades from the frontof the machine, although it is customary in some shopsto feed from the rear of the machine. The latter methodof cutting with the squaring shears is more usually prac-ticed when short pieces are to be cut from sheets of great Upper CuttingBlade Lower BladeBed GaugeArm Gauqe Guide Rod5 GaugeClamping lino!. foot Treadle Rear Gauge Arm AdjustableGaugeholder SideSpring Side Guide Leg andHousing urnbuchleLong Con-necting Rod BedAdjusting Screws Figure 1.—Foot Power Squaring Shears. length, for the purpose of allowing more freedom inoperating the foot treadle; but when the sheet can behandled conveniently, the best results are secured whenit is inserted in the usual way, from the front of themachine. When entering the sheet from the rear of themachine, the front bed gauges are used, and where thepiece to be cut is larger than the bed in the machine,the bed gauge is carried out on the front bed gauge arms,provided for gauge extension. In squaring and trimmingsmall pieces, the material is inserted in the machine be-tween the cutting blades from the front of machine, 24 SHEET METAL WORKERS MANUAL
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Keywords: ., bookcentury1900, bookdecade1910, bookidsheetmetalwo, bookyear1918
