Inhaltsangabe
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. 1897 Excerpt: ...it would be 4 pitch. A 24-inch gear to have teeth of the same size would have twice 48 or 90 teeth, and 90-f-24 = 4, the same diametral pitch as before. Fig. 415 shows the sizes of teeth of various diametral pitches. Diametral pitch has also been defined as the number of teeth in a gear of one inch diameter, which amounts to the same as the definitions above. Using for illustration a wheel 10 inches in diameter with 60 teeth, we have,., circumference 10X3.1410 _„.., circular pitch =-----r =--=----TM =-524 inch. No. of teeth 60 Diametral pitch =--=--= 0. r diameter 10 1554. Other Definitions.--The other necessary definitions applying to the parts of a gear can be readily understood from Fig. 414. The thickness of the tooth and width of the space are measured on the pitch circle. A tooth is composed of two parts, the addendum, or outside of the pitch circle, and the root, which is inside. A line through the outside end of the addendum is called the addendum circle, or addendum line, and one through the inside part of the root is called the root circle, or root line. The amount by which the width of the space is greater than the thickness of the tooth is called the back lash, or clearance. 1555. Proportions for Gear Teeth.--With gears of large size, and often with cast gears of all sizes, the circular pitch system is used. In these cases, it is usual to have the addendum, whole depth, and thickness of the tooth conform to arbitrary rules based upon the circular pitch. None of these rules can be considered absolute, however. Machinemoulded gears require less clearance and back lash than handmoulded, and very large gears should have less, proportionately, than smaller ones. The following table of proportions that have been used successfully will serve as a...
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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. 1897 Excerpt: ...it would be 4 pitch. A 24-inch gear to have teeth of the same size would have twice 48 or 90 teeth, and 90-f-24 = 4, the same diametral pitch as before. Fig. 415 shows the sizes of teeth of various diametral pitches. Diametral pitch has also been defined as the number of teeth in a gear of one inch diameter, which amounts to the same as the definitions above. Using for illustration a wheel 10 inches in diameter with 60 teeth, we have,., circumference 10X3.1410 _„.., circular pitch =-----r =--=----TM =-524 inch. No. of teeth 60 Diametral pitch =--=--= 0. r diameter 10 1554. Other Definitions.--The other necessary definitions applying to the parts of a gear can be readily understood from Fig. 414. The thickness of the tooth and width of the space are measured on the pitch circle. A tooth is composed of two parts, the addendum, or outside of the pitch circle, and the root, which is inside. A line through the outside end of the addendum is called the addendum circle, or addendum line, and one through the inside part of the root is called the root circle, or root line. The amount by which the width of the space is greater than the thickness of the tooth is called the back lash, or clearance. 1555. Proportions for Gear Teeth.--With gears of large size, and often with cast gears of all sizes, the circular pitch system is used. In these cases, it is usual to have the addendum, whole depth, and thickness of the tooth conform to arbitrary rules based upon the circular pitch. None of these rules can be considered absolute, however. Machinemoulded gears require less clearance and back lash than handmoulded, and very large gears should have less, proportionately, than smaller ones. The following table of proportions that have been used successfully will serve as a...
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