My Classroom Online

Rivets Rivets are a permanent mechanical fastener . Before being installed, a rivet consists of a smooth cylindrical shaft with a head on one end. The end opposite the head is called the buck-tail . On installation the rivet is placed in a punched or drilled hole, and the tail is upset , or bucked (i.e., deformed), so that it expands to about 1.5 times the original shaft diameter, holding the rivet in place. To distinguish between the two ends of the rivet, the original head is called the factory head and the deformed end is called the shop head or buck-tail. Because there is effectively a head on each end of an installed rivet, it can support tension loads (loads parallel to the axis of the shaft); however, it is much more capable of supporting shear loads (loads perpendicular to the axis of the shaft). Bolts and screws are better suited for tension applications. Fastenings used in traditional wooden boat building , such as copper nails and clinch bolts , work on the s...

KIMPALAN ARKA Mesin Kimpalan Arka Mesin kimpalan arka adalah merupakan sebuah alatubah perendah iaitu ia mngubah dari voltan tinggi kepada voltan rendah tetapi menghasilkan arus yang tinggi untuk menerbitkan arka bagi kegunaan mengimpal. Dilengkapi dengan kabel pemegang elektrod dan juga kabel bumi ke meja kerja. Arc welding machine Arc welding machine has been a lowering of transformers it changed from a high voltage to low voltage but high current, to publish for the use of arc welding. Equipped with an electrode holder cable and earth cable to a desk job       MIG WELDING       metal inert gas ( MIG ) welding or metal active gas ( MAG ) welding , is a welding process in which an electric arc forms between a consumable wire electrode and the workpiece metal(s), which heats the workpiece metal(s), causing them to melt and join. Along with the wire electrode, a shielding gas feeds through ...