This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1871 Excerpt: ... L. M. To draw the Pitch Line of a Pinion to contain a definite number of Teeth of the same size as in the given wheel K. 1st. Divide the proportional diameter A. B of the given wheel into as many equal parts as the wheel has teeth, viz. 16. 2nd. With a distance equal to one of these parts, step ofF on the line B. D as ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1871 Excerpt: ... L. M. To draw the Pitch Line of a Pinion to contain a definite number of Teeth of the same size as in the given wheel K. 1st. Divide the proportional diameter A. B of the given wheel into as many equal parts as the wheel has teeth, viz. 16. 2nd. With a distance equal to one of these parts, step ofF on the line B. D as many steps as the pinion is to contain teeth, which will give the proportional diameter of the pinion; the diagram contains 8. 3rd. Draw the pitch circle, and on it with the distance E. F, the pitch, lay off the teeth. 4th. Sub-divide the pitch for the tooth and space, draw the sides of the teeth below the pitch line toward the centre, and on the tops of the teeth describe epicycloids. Note.--The circumferences of circles are directly as their diameters; if the diameter of one circle be four times greater than another, the circumference will also be four times greater. Fig. 2 is another method for drawing the teeth; A. B is the pitch circle on which the width of the teeth and spaces must be laid down. Then with a radius Ji, E or P. F, equal to a pitch and a fourth, from the middle of each tooth on the pitch circle as at D, describe the tops of the teeth E and F, from O describe the tops of the teeth G and D, and so on for the others. The sides of the teeth within the pitch circle may be drawn toward the centre, as at Fand H, or from the centre O, with a radius equal to 0. Q or 0. P, describe the lower part of the teeth G and B. PLATE XXX. ISOMETRICAL DRAWING. Figure 1. To draw the Isometrical Cube. Let A be the centre of the proposed drawing. 1st. With one foot of the dividers in A, and any radius, describe a circle. 2nd. Through the centre A, draw a diameter B. C parallel to the sides of the paper. 3rd. With the radius from the points B and C..
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