Metrology and Quality Control Lab

 EXPERIMENT NO 6 TITLE: Demonstration  of  surfaces  inspection  using  optical  flat/interferometers.  /  Demonstration  of surface roughness measurement using surface roughness tester. APPARATUS:  Optical Flat, Mercury lamp etc. THEORY:  Light can be considered as an electromagnetic wave of sinusoidal form. High point and low point of the wave are called as crest and trough resp. the distance between a consecutive crest and a trough is called as wavelength ‘λ’. Maximum displacement of the wave is called as “amplitude”. Velocity of transmission is λ\T where T is the time provided. Wavelength has a precise value and form. INTERFFERANCE OF TWO RAYS: Let us consider effect of combining two monochromatic rays of light of intensity having amplitude A1 and An. 1.    If they have combined with each other, the resultant effect is production of maximum illuminator and the resultant amplitude of addition af A1 and An. 2....

 EXPERIMENT NO 5 TITLE: Measurement of gear tooth thickness by gear tooth Vernier Caliper/Constant Chord/Spam micrometer. APPARATUS:  Gear tooth vernier caliper, vernier caliper 12’’ 300 mm, bench vice. THEORY: Brief description of different characteristics of measuring of tooth thickness by gear truth vernier is given. It consists of a horizontal and a vertical vernier scale. It is based on the principle of vernier scale. The thickness of a tooth at pitch line and the addendum is measured by an independent tongue each of which is adjusted independently by adjusting the slide screws on graduated beams. TERMINOLOGY OF GEAR TOOTH (i)    Pitch circle diameter (PCD) : It is the diameter of a circle which by pure rolling action would produce the same motion on the toothed gear wheel. It is equal to D = (T X OD)/(T+2)OD = outside diameter T = number of teeth (ii)    MODULE: It is defined as the length of the pitch circle diameter per truth. ...