Beale, Oscar James, Brown & Sharpe Manufacturing Company (Providence, R.I.) · Providence, R.I. : Brown & Sharpe Mfg. Co. · leaf 33
5^° with pitch lines, alternate lines slanting in oppo-site directions. The left-hand side of each rack toothis perpendicular to the line BA. The right-hand sideof each rack tooth is perpendicular to the line BA. 4. Add fillets at bottom of teeth equal to \ of thewidth of spaces between the rack… … Upon the pitch line h b, draw any semicircle—baa b. From point b lay off upon the. semicirclethe distance b a, equal to one-quarter of the diameterof semicircle, and draw a straight line through b and a. This line, b a, makes an angle of 75 J ° with pitch lineb b\ and can be one side of rack tooth.…
Gearing
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