Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator . only saves time in the drafting room in checking and general refer-ence work, but it gives the workman a better idea of how the partsare expected to go together, thus fulfilling the general definition ofa working drawing as complete and definite instruction. Gear with Split Hub. Conventional Drawing. Fig. 39 shows agear with a split hub, the bolts through the hub being for the pur-pose of tightly clamping sam

Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator . only saves time in the drafting room in checking and general refer-ence work, but it gives the workman a better idea of how the partsare expected to go together, thus fulfilling the general definition ofa working drawing as complete and definite instruction. Gear with Split Hub. Conventional Drawing. Fig. 39 shows agear with a split hub, the bolts through the hub being for the pur-pose of tightly clamping sam Stock Photo
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Contributor:

The Reading Room / Alamy Stock Photo

Image ID:

2AXBCKC

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7.2 MB (318.4 KB Compressed download)

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Dimensions:

1445 x 1730 px | 24.5 x 29.3 cm | 9.6 x 11.5 inches | 150dpi

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Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator . only saves time in the drafting room in checking and general refer-ence work, but it gives the workman a better idea of how the partsare expected to go together, thus fulfilling the general definition ofa working drawing as complete and definite instruction. Gear with Split Hub. Conventional Drawing. Fig. 39 shows agear with a split hub, the bolts through the hub being for the pur-pose of tightly clamping same to the shaft. This is an illustrationof the conventional method of showing a gear with standard propor-tions of teeth. If the drawing were made exactly as the gear wouldlook, it would be necessary to spend a large amount of time inkingin the outlines of the 72 teeth around the circumference of the gear; MACHINE DRAWING 47 instead of doing this, the pitch line of the gear is shown, and circlesdrawn indicating the top and bottom of the teeth. The pitchdiameter and outside diameter are given, and the proper depth oftooth cut to be made by the gear cutter; nothing more is necessary.. GEARCUT 73T.-LD.R INVOLUTEONE- C. A Fig. 39. Detail of Gear with Split Hub The information which enables the workman to choose the propercutter is given in the title; thus, Cut 72 Teeth—1 Diametral Pitch—Involute. The workman will receive from the tool room a stand-ard involute cutter marked for 72 teeth, 1 diametral pitch. Afterplacing same on the arbor of the gear-cutting machine, he will dropthe cutter into the gear blank to the depth called for by the drawing; 4* MACHINE DRAWING &this is accurately done, it will give the desired standard thicknessand-clearance of the teeth, and the automatic indexing of the machinewill produce the 72 teeth, accurately spaced. If the gear were acast gear:—an which case the pattern maker would have to lay outthe teeth and finish them one by one on the pattern

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