. American engineer . ern Cotton Manufacturers.—Statistics of the CensusBureau issued August 31. 1912. indicate that the cotton-growingstates used 2,712,622 bales for manufacturing purposes as ,049 in all the other states of the union. The number ofspindles increased by about 500,000 over that operated theprevious year. Peyig SEMI-AUTOMATIC NUT TAPPER A new. ten-spindle IK n. semi-automatic nut tapping ma-chine has been perfected by the National Machinery Company,Tiftin, Ohio. While somewhat similar to the 1 in. six-spindlemachine designed by the same company, it embodies certainim
. American engineer . ern Cotton Manufacturers.—Statistics of the CensusBureau issued August 31. 1912. indicate that the cotton-growingstates used 2,712,622 bales for manufacturing purposes as ,049 in all the other states of the union. The number ofspindles increased by about 500,000 over that operated theprevious year. Peyig SEMI-AUTOMATIC NUT TAPPER A new. ten-spindle IK n. semi-automatic nut tapping ma-chine has been perfected by the National Machinery Company,Tiftin, Ohio. While somewhat similar to the 1 in. six-spindlemachine designed by the same company, it embodies certainimprovements, notably the gear box, which permits a rapidchange of the spindle speeds at the operators will and whilethe machine is running. This gear box takes the place of theremoval and substitution of gears which was previously neces-sary. It is believed that the ease with which changes canbe effected will prompt the operator to reduce the spindle revo-lutions as the taps arc tirnunil and the cutting teeth reduced. Ten-Spindle Semi-Automatic Nut Tapping IVlachine. in number, so that there will be little or no idle tapping time—taps running free in the nut after it is tapped—which tends toreduce maximum output. The spindles are raised and lowered by cams. Through thisautomatic spindle movement, the machine sets the pace of theoperation, and the operator can devote his entire energ> tofeeding. Trials have demonstrated that operators have notrouble in meeting the uniform pace set by the machinethroughout a working day. This method of raising and lower-ing the spindles also tends to prolong the life of the taps, asthe spindle descends gradually, and the tap is not subjected tosudden and excessive torsional strains. The cams have threesteps, and by shifting the cam shaft, the resting time of thespindles when raised can be altered to meet the needs of theoperator for feeding. The spindles are close together—the ten spindles being with-in a space of 69 in.—which facilit
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
