helicaladj.n.
/ˈhɛlɪkəl/ A. adj.
Belonging to or having the form of a helix; screw-shaped; spiral. Also in combinations, as helical gear, helical tube, helical-cut adj.
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the world > space > shape > curvature > coil > [adjective] > spiral or helical > helical
spiral1556
whelkeda1560
screwish1570
helical1613
screwed1615
cochleary1646
cochleous1694
helicoid1704
cochleateda1728
cochleate1835
helicoidal1864
society > occupation and work > equipment > machine > parts of machines > wheel > [noun] > cog or gear > with axles or teeth set at specific angle
crown wheel1646
mitre wheel1825
mitre1844
skew gearinga1877
helical gear1888
spiral gear1888
skew gear1908
helical1913
spiral bevel gear1915
1613 M. Ridley Short Treat. Magneticall Bodies 27 A Helicall and Spirall vertue to move on the Cilinder of her Axis in Spirall lines.
1648 Bp. J. Wilkins Math. Magick i. ix. 57 A helicall revolution about a Cylinder.
1789 Trans. Soc. Arts (ed. 2) 1 217 The mean helical angles of Archimedean or Water Screws.
1884 F. J. Britten Watch & Clockmakers' Handbk. (new ed.) 16 For marine chronometers helical springs, in which both ends curve inwards, are universally used.
1888 Lockwood's Dict. Mech. Engin. Helical gear, toothed gear in which the wheel-teeth instead of being at right angles with their faces are set at some other angle therewith.
1904 G. F. Goodchild & C. F. Tweney Technol. & Sci. Dict. 146/1 A form of tube known as ‘helical’, which is formed from a thin steel band or ribbon, wrapped into the form of a tube and brazed at the edges.
1908 Westm. Gaz. 28 May 4/2 The live axle is chiefly noticeable for its helical-cut driving pinion.
1908 Westm. Gaz. 18 Nov. 5/1 Several of the wheels have helical-cut teeth.
1958 Which? 1 iii. 30 The new..[drill] has..helical gears, which give quieter running and longer life.
B. n.
= helical gear at sense A.
ΘΚΠ
society > occupation and work > equipment > machine > parts of machines > wheel > [noun] > cog or gear > with axles or teeth set at specific angle
crown wheel1646
mitre wheel1825
mitre1844
skew gearinga1877
helical gear1888
spiral gear1888
skew gear1908
helical1913
spiral bevel gear1915
1913 Lockwood's Dict. Mech. Engin. (ed. 4) (at cited word) Helical gear cutting, Double helicals are cut in the same way if the teeth are staggered and divided at the apex.
This entry has not yet been fully updated (first published 1898; most recently modified version published online March 2019).
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adj.n.1613