Question

1 Define (a) Screw thread and (b) Lead of screwthread.
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Answer 1

Answer:

(a)Screw thread

A screw thread is defined as a ridge of uniform section in the form of a helix on either the external or internal surface of a cylinder. ... This is the number of complete threads occurring in one inch of threaded length. Metric thread pitch is designated as the distance between threads (pitch) in millimeters.

(b) Lead of screw thread.

Lead is the axial advance of a helix or screw during one complete turn (360°) The lead for a screw thread is the axial travel for a single revolution. Pitch is defined as the axial distance between adjacent threads on a helix or screw.  They only differ in "multiple start" screws, which have several intertwined threads

Answer 2

Answer:

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