Mechanical tools

  Types of Angle plates . the constructional features of different types of  angle plates . the types of angle plates . the uses of different types of angle plates . the grades of angle plates Specify angle plates. Contractional features Angle plates have two plane surface, machined perfectly flat andd at right angles. Generally these are made of closely grained cast iron or steel. The edges and ends are also machined squre. They have ribs on the unmachined part of good rigidity and to prevent distortion. Types of Angle plates Among the three types of angle plates normally used, the plain solid angle plate is the most common. It has the two plane surface perfectly machined at 90° to each other. Such angle plates  are suitable for supporting work pieces during layout work. They are comparatively smaller in size. Slotted type angle plates The two plane surfaces of this type of angle plate have slots milled. It is comparatively bigger size than the plain solid angle plates. ...

  VEE THREADS . types of 'vee' threads used for thread fastening . distinguish the features of different 'vee' thread forms . designate different types of 'vee ' threads Types of 'vee' Threads 'Vee' threads are available in different forms and standards. The type of ' vee' threads used for general engineering threaded fasteners are ISO metric thread ISO inch(unified thread) British standard whitworth thread British standard fine thread. ISO metric thread This is the form of thread approved by B.I.S. for threaded fastening. Two series of threads have been identified by them. They are ISO meric-coarse ISO metric-fine. The thread angle is 60°.the root of the external thread is rounded. The crest of the external thread is flat, but sometimes it is rounded depending on the type of the manufacturing process. The root of the internal thread is cleared beyond the width equal to one eighth of the pitch and is rounded. The Crest of the internal thr...