Handy man's workshop and laboratory . to each other,the one horizontal and the other inclined. The horizontal shaft Bwas fitted with a worm, which meshed with a gear D on one endof the shaft C, the opposite end of which carried a face mill inclination of the shaft was such that the plane of the cuttercoincided with the desired pitch of the spiral groove. The bracketA was bolted to the cross-feed slide of the lathe. The shaft Bwas fitted with a pulley F, which was belted to a long pulley ordrum G on the countershaft above. A special gear was required HANDY MAN S WORKSHOP AND LABORATORY 15
Handy man's workshop and laboratory . to each other,the one horizontal and the other inclined. The horizontal shaft Bwas fitted with a worm, which meshed with a gear D on one endof the shaft C, the opposite end of which carried a face mill inclination of the shaft was such that the plane of the cuttercoincided with the desired pitch of the spiral groove. The bracketA was bolted to the cross-feed slide of the lathe. The shaft Bwas fitted with a pulley F, which was belted to a long pulley ordrum G on the countershaft above. A special gear was required HANDY MAN S WORKSHOP AND LABORATORY 157 to feed the carriage at the requisite speed. A bracket H wasbolted to the head-stock of the lathe, and furnished bearings for ashaft which was fitted at one end with a pinion J, adapted to en-gage the face gear of the back drive, and at the other with agear K, adapted to mesh with a gear L on the feed screw. Bythis means a 12 to 1 reduction was furnished between the faceplate and the screw. The low speed of the driving pulleys was. Fig. 140—A milling attachment for the lathe used so that a single rough cut and a finishing cut sufficed toform the spiral groove in the shaft. This idea was the forerunnerof the thread milling machine.—42 CUTTING A GROOVE OF 42-INCH PITCH ON A 1%-INCH SHAFT The writer when a lad serving his apprenticeship cut on alathe with a feed screw of y2-mch pitch a groove in a 1^2-inchshaft to a depth of % inch, which had one turn in 3 feet 6 inches. 158 HANDY MAN S WORKSHOP AND LABORATORY The method adopted was to use six change wheels and drive thefeed screw with a pulley fixed to the side of the wheel on the was an open and cross belt on the countershaft, so thatthe motion could be reversed. Another belt ran from the counter-shaft to the pulley on lathe feed screw. The nut engaging thelathe saddle was not taken out of gear with the feed screw, butthe saddle was run to and fro by reversing the motion of thescrew.—80 CUTTING A CAM GROOVE W
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