1. a) Define roughness
roughness is the surface that occured on the object wether it is in high or low roughnes
b) list 4 elements for surface roughness
- flaw
- lay direction
- roughness height
- roughness width
- walviness width
- walviness height
- roughness-width cut off
c) explain effect of surface roughness on functional properties:
The surface roughness influence the functional properties if the roughness of object is highher, the energy to push the object on something is higher. The roughness on an object that stop the surface to continue to move. so it stop the functional of the object to ware resistance
2. a) label screw structure part
- pitch diameter
- thread angle
- minor diameter
- crest
- pitch
- root
- helix angle
b) explain what is major diamter
Major diameter is the diameter of an imaginary co-axial cylinder which is touches the crest of an internal thread or the roots of an internal thread
c) list the mearement instrutment for each mearurement
- major and minor diameter: ruler, vernier caliper,profile projection,tool microscope
- pitch length: ruler and screw thread diameter and profile projector
- pitch angle : screw thread micrometer, profile projection
- thread angle : profile projection
3.a) Name the geometrical properties
- roughness or circularity
- flatness
- straightness
- paralellism
- perpendicularity
- symmetry
- angular
- cylindricity
b) state which is the part of geometrical dimensional and tolerances based on the diagram.
