MECHANICAL ROCKS

INTRODUCTION     The above figure shows the spray-up process.      It consists of fibre, chopper, mould etc...      Spray-up is an open moulding , composite fabrication process where resin and reinforcement are sprayed onto a reusable mould.   Working      First we cut the continuous fibres by help of chopper.      Then a mixture of fiber and resin along with catalyst is sprayed simultaneously onto a vertical mould.      The density of deposited laminate is later increased with the help of a roller by removing the entrapped air.      Multiple layers may be added to produce the desired thickness.      Curing is usually at room temperature but may be accelerated by the application of a moderate amount of heat.                   ...

  INTRODUCTION Pultrusion process is the type of closed mould processes. It is used for producing fiber reinforcement plastic of constant cross section such as I-beam, tube, pipes etc. The above figure shows that Pultrusion process. It consists of roller, tank which containing plastic resin, heated die and soon. WORKING Fibres are drawn from spools through uncured resin bath for impregnation. Then impregnated fibres are first fed into a pre-forming box which gives appropriate orientation to the fibres. These oriented fibres are then fed into a heated steel die, where polymerisation and curing takes place, and also determines the cross section of composite stock. After that pulling operation.(continuous length of consent cross-section can be drawn through die.  Reinforcement used in Pultrusion E-Glass, S-Glass /Carbon /Graphite/Aramid reinforcement are used.The forms either roving or mat or fibres...

INTRODUCTION ·        It is the method of production of  fiber -reinforcement plastics. ·        It is the open mould process. ·        It is the simple and oldest method. ·        There is virtually no limit to the size of the part that can be made. ·        The mould can be made of wood, sheet metal, plaster and FRP composite. ·     Working ·        In order to produce a composite by using glass fibres and polyester resin, a gel coat is first applied to the open mould. ·        Fibre glass reinforcement which is normally in the form of a cloth or mat is manually placed in the mould. ·        After pouring the plastic resin which are mixed with the catal...

DEFINITION Robot programming is defining of desired motions so that the robot may perform them without human intervention. Types of programming method for robot 1. Manual method 2. Walk through method (manual lead through) 3. Lead through method (on-line) 4. Off-line programming 1.                         Manual method :- ·        In this type of method we used for small robots and for simple applications. ·        It is more like setting up a machine rather than programming ·        By using limit switches, mechanical stops, cams, relays for control the robot motions. ·        This method mainly used for lower technology robots for short work cycles Ex – pick and place robots 2. Walk through  metho...

DEFINITION ·        Group technology is a manufacturing philosophy in which we are grouped the part based on the similarities in design or manufacturing process. ·        The main purpose of group technology is to reduce the overall manufacturing cost. There are two types of part families :- a)    Based on the design characteristics b)   Based on the manufacturing  characteristics 1.   Based on the design characteristics As a name suggest that the grouping of the part is based on the design characteristics such as geometric shape and size. Such part may have different manufacturing characteristics due to change in quantity, tolerance, type of material. For example:- 2. Based on the manufacturing characteristics Here part is grouped, based on the manufacturing characteristics but having different design characteristics.   For example:- ...

Introduction Robotic sensing is the sub area of robotic science in which we are study of robotic sensor. By use of certain mechanisms the robot is interact of the environment is known as sensors. Robot sensor performs travel function like identification of object, guiding the robot without obstructions identification of path, and so on. Generally it is two types -: 1.     Internal sensors 2.     External sensors 1.     Internal sensors are used to provide information like joints position, velocity, acceleration etc... 2.     External sensor provides the information about the external environment surrounding the robot.

INTRODUCTION   Numerical control is a system which the actions are controlled by direct insertion of numerical data at some point.  NC (Numerical control) can be defined as a form of programmable automation in which the machine or machine tool action is controlled by a program. Program is containing coded numeric data .  Basic Components of NC (Numerical control) System   1. Program of instructions 2. Machine control unit or controller unit (MCU) 3. Machine tool.   Program of instructions :- ·       It is a detailed step by step Set of directions to the machine tool for doing particular work.                                                     OR · ...