Canadian foundryman (1921) . e table and in the columnheaded Flank Radius is found the and this multiplied by the circularpitch gives With the dividers setto this radius and the center on the basecircle, draw the flanks of the teeth fromthe pitch circle to the base circle. Fromthe base circle continue the flanks of theteeth to the root circle by straight radiallines and round the roots of the teethwith a fillet. To lay off the rack teeth it is firstnecessary to draw a straight line for the pitch line and two parallel lines for theaddendum and root lines. The sides ofthe teeth
Canadian foundryman (1921) . e table and in the columnheaded Flank Radius is found the and this multiplied by the circularpitch gives With the dividers setto this radius and the center on the basecircle, draw the flanks of the teeth fromthe pitch circle to the base circle. Fromthe base circle continue the flanks of theteeth to the root circle by straight radiallines and round the roots of the teethwith a fillet. To lay off the rack teeth it is firstnecessary to draw a straight line for the pitch line and two parallel lines for theaddendum and root lines. The sides ofthe teeth are drawn through the pitchpoints at an angle of 15 degrees from theperpendicular, as shown in Fig. 4. The point of the tooth from the pointA Fig. 4 to B must be rounded by an arcdrawn from a center on the pitch line, and with the dividers set to a radiusequal to inches divided by the diam-etral pitch or the circular pitch multi-plied by .67. In the case under consid-eration multiplying .67 by the circular ^.^/w^ifcJW^.. FIG. 5—LAYING OUT EPICYCLOIDAL TOOTHBY ODONTOGRAPH TABLE. pitch we obtain as the radius to beused. Epicycloidal Odontograph Tables Grant has also gotten up an odonto-graph table giving the proportions ofepicycloidal teeth. To apply this table inlaying out the gear shown in Fig. 5 wewill proceed as follows: The gear has 21 teeth, inchespitch diameter and 1% inches circularpitch. The pitch circle, addendum androot circles should be drawn. The pitchpoints should also be marked on the pitchcircle. In the odontograph table we find op-posite 21 under the head of circular pitch
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfoundri, bookyear1921
