helicoid

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helicoid

[′hel·ə‚kȯid]
(invertebrate zoology)
Of a gastropod shell, shaped like a flat coil or flattened spiral.
(mathematics)
A surface generated by a curve which is rotated about a straight line and also is translated in the direction of the line at a rate that is a constant multiple of its rate of rotation.
References in periodicals archive ?
SC ICTCM, 2007), allows the processing of cylindrical parts, which have the length/ diameter rapport ~ 5 and small diameters, diameters smaller than 200 mm for turning operations, and process the parts with dimensions less than 600x600mm, with h=500mm for milling, drilling, boring, mortising, toothing, plane, exterior and interior cylindrical and helicoidally rectification.
After the transducer is placed, it is stressed by two forces F with equal values and in opposite directions, representing the action of the helicoidally compression spring, respectively the reaction of the supporting element.
22), suggested that lamellae in a banded spherulite can be represented by a radially oriented assembly of continuous helicoidally twisted lamellae.
The inner-bone part of the implant consists of a screw implant whose body has a tapered cylinder of 1 degree at the bottom and on that there are some very narrow helicoidally spires, while the upper body has inside a hole in which there are placed the nip-screwing elements of the implant and the fixation element of the oral part of the implant that consist of a hexagonal portion to be screw into the bone and a 45 degrees bowed portion on which there is placed a scarring-bone screw in the superior component.
The faces are machined as a flat helicoidally speed, machining alternate both faces, two times each.
The circular moving from the entrance is changed than in a descendant helicoidally one (because of the continuous hydromass contribution), so in the vicinity of the top of the cone a part of the fluid is changed the moving sense in an ascending one like in fig.
The pillars (6) are oriented diagonally and serve to guide the arm (5) (that moves via helicoidally transmissions) the function of which is to apply the charge (the static load).
Torus for assessing the ability to build this type of feature and other similar features like helicoidally channel with circular profile (for ball screws)