Mechanical drawing for trade schools by Leeds Charles Carley 1870-

Author:Leeds, Charles Carley, 1870- [from old catalog]
Language: eng
Format: epub, pdf
Tags: Mechanical drawing
Publisher: New York, D. Van Nostrand company
Published: 1909-03-25T05:00:00+00:00

LESSON No. 24.

SPECIFICATIOX.—This lesson is for the purpose of helping the student to de\ elop the facuhy of making mental pictures, to force him to make a drawing of something not shown, but for which it is necessary for him to use his imagination.

From the following data make a half-size two-\iew mechanical drawing of the cast-iron puUev described. For the sectional view use the conventional method described in Lesson No. 14 on the hand wheel.

Diameter of the pulle\-1 foot 2 inches at the crown (or greatest diameter); face or width 6 inches; taper of crown equals \ inch per foot.

Diameter rf hub 3! inches; length of hub 4 inches; bore i|- inches; with ke\^vay y^ inch wide b\- -f^ inch high.

Rim to be made with rib around inside where joined to arms. Rim \ inch thick at edge, and -^-g inch thick through crown and rib; inside of rim to be straight to arms.

Number of arms 6; arms to be \\ inches wide bv | inch thick at rim, and 11 inches wide by jf inch thick at hub; j-inch fillets (or rounded

comers) at side of arms at hub, and at side and edge of arms at the rim; |-inch radius at the junction of the arms near the hub.

\\'hen locating the keyway in the side view showing the end of the hub, be sure to place it central with one of the arms, as this will give a stronger hub section than if the kevwav is placed midwa\" between two arms.

The student is expected to first make a freehand sketch of the two views of the pulley. On this sketch lie should place all the dimensions given above, and then use the sketch as a guide when laying out the working drawing. It is assumed that the student will tn,- to study out this lesson without looking at a model in the shop, so that he may derive the greatest benefit from his efforts. There is no objection to the student examining a model aj!cr he has finished his freehand sketch to the satisfaction of his instructor.

!Make a tracing of the finished pencil drawing, tlie title to Ije 14" Pulley, Drawing C-ioiq.

Take plenty of time and get all possible from this lesson.

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