Screw threads
Dr. D S Sai Ravi Kiran, M.E, PhD
Asst. Professor
Department of Mechanical
Gears & Engineering
ANITS
Surface Texture
,Screw thread measurement
Introduction
Thread forms
Measurement of various elements of threads
Tool Makers Microscope
, Introduction
• A screw thread is a helical rigid
produced by forming a helical
groove of uniform cross section
in the external or internal
surface of a cylinder or cone.
• Screw thread formed on a
cylinder is known as parallel
screw thread while the one
formed on a cone is known as
tapered thread
, Nomenclature
Crest
Root