dedendumn.

/diːˈdɛndəm/

Etymology: Latin, neuter gerundive of dēdere to give up, surrender.

Mechanics.

(a) ‘That part of the tooth of a cog-wheel or gear which is inside the pitch-circle and is intercepted between the pitch-line and the circle which limits all the roots of the teeth and the spaces between them’ ( Cent. Dict. Suppl., 1909). Also attributive. (b) (See quot. 1958.)

ΚΠ

1901 Internat. Libr. Technol. II. (Gear-Cutting) §17. 7 A tooth is composed of two parts, the addendum, or part outside the pitch circle, and the part inside, which is called either the root or the dedendum.

1909 Hawkins' Mech. Dict. 185/2 The dedendum circle is the circle within the pitch circle, to which the bottom of each tooth extends.

1925 S. J. Berard & E. O. Waters Elem. Machine Design x. 180 The bottoms of the grooves are limited by a root or dedendum circle, distant from the pitch circle by an amount called the dedendum.

1949 E. Buckingham Analyt. Mech. Gears xii. 256 We shall use a constant axial pitch of 1 in... This would give us the following thread proportions:..Dedendum 0·3247 [in.].

1958 Chambers's Techn. Dict. Add. 971/1 Dedendum, radial distance between the pitch and minor cylinders of an external screw thread; radial distance between the major and pitch cylinders of an internal thread.

1961 P. S. Houghton Gears (ed. 2) i. 6 The dedendum of spur, helical and worm gearing is the radial distance of the tooth measuring from the pitch circle to the bottom of the tooth space. For a bevel gear it is the depth of the tooth space below the pitch circle measuring along the back cone generator or edge angle.

This entry has not yet been fully updated (first published 1972; most recently modified version published online September 2018).

单词	dedendum
释义	dedendumn. /diːˈdɛndəm/ Etymology: Latin, neuter gerundive of dēdere to give up, surrender. Mechanics. (a) ‘That part of the tooth of a cog-wheel or gear which is inside the pitch-circle and is intercepted between the pitch-line and the circle which limits all the roots of the teeth and the spaces between them’ ( Cent. Dict. Suppl., 1909). Also attributive. (b) (See quot. 1958.) ΚΠ 1901 Internat. Libr. Technol. II. (Gear-Cutting) §17. 7 A tooth is composed of two parts, the addendum, or part outside the pitch circle, and the part inside, which is called either the root or the dedendum. 1909 Hawkins' Mech. Dict. 185/2 The dedendum circle is the circle within the pitch circle, to which the bottom of each tooth extends. 1925 S. J. Berard & E. O. Waters Elem. Machine Design x. 180 The bottoms of the grooves are limited by a root or dedendum circle, distant from the pitch circle by an amount called the dedendum. 1949 E. Buckingham Analyt. Mech. Gears xii. 256 We shall use a constant axial pitch of 1 in... This would give us the following thread proportions:..Dedendum 0·3247 [in.]. 1958 Chambers's Techn. Dict. Add. 971/1 Dedendum, radial distance between the pitch and minor cylinders of an external screw thread; radial distance between the major and pitch cylinders of an internal thread. 1961 P. S. Houghton Gears (ed. 2) i. 6 The dedendum of spur, helical and worm gearing is the radial distance of the tooth measuring from the pitch circle to the bottom of the tooth space. For a bevel gear it is the depth of the tooth space below the pitch circle measuring along the back cone generator or edge angle. This entry has not yet been fully updated (first published 1972; most recently modified version published online September 2018). < n.1901
随便看	eight-square eight-wheeled eight-wheeler eight-yarder eightandsixpenny eightangled eightbearer eightbore eightbox system eightbuttoned eightcelled electrodynamometers electroed electroejaculation electroencephalogram electroencephalograms electroencephalograph electroencephalographer electroencephalographers electroencephalographic electroencephalographically electroencephalographies electroencephalographist electroencephalographs electroencephalography