Bihanga Borah's Blog

A   lathe machine   is a mechanical device in which the workpiece is rotated against a suitable   cutting tool   for producing cylindrical forms in the metal, wood or any other machinable material. Lathe machine Various types of lathe machine tools Copy lathe Automatic lathe Turret lathe machine Engine lathe Bench lathe Chucking lathe Speed lathe Automatic screw machine or a bar machine Numerically controlled lathe Lathe Machine parts: Lathe machine parts labeled Different parts of Lathe are: Headstock : Headstock supports the main spindle in the bearings and aligns it properly. It also houses necessary transmission mechanism for different speeds. It supports the main spindle in the bearings and aligns it properly. It has a mechanism for getting different speeds. Accessories mounted to headstock spindle are 3/4 jaw chuck, lathe centre and lathe dog, collect chuck, face plate and magnetic chuck. Split nut : When closed around t...

High-Speed Steels (HSS) are the   cutting tool materials   used for machining of materials. The HSS will be used for machining of materials. The General use of HSS is  18-4-1 . 18%  of Tungsten or Molybdenum, used for increasing hot hardness temperature of tool material. 4%  of Chromium, used for increasing the strength of resistance to deformation of the cutting tool material. 1%  of Vanadium, used for increasing the wear resistance of the cutting tool material or for maintaining the keenness of cutting edge. In addition to these 2.5 to 10 %, cobalt is used to increase the red hot hardness of tool. Drill bits made of High-Speed Steels If 18% tungsten is used in the HSS is called tungsten based HSS and if 18% molybdenum is used in HSS is called molybdenum based HSS. Out of the two the most commonly used HSS is the tungsten based HSS even though the molybdenum is cheaper than tungsten because the tungsten based HSS will have high...

Aim – Learning various nursery operations like preparation of beds, filling of polythene bags, pots, shifting of plants, watering plants etc. Requirements - Pick axe, spade, soil, compost, polythene bags, other pots for growing plants, plants grown in beds. Procedure – 1)      Do different nursery activities one by one. 2)      First of all prepare nursery beds and raised bed. Dug the soil, crush the clods and prepare a raised bed of size 2m X 1m X 15cm. Also prepare a nursery bed of size 2m X 1m and depth 15 to 30 cm. 3)      Sow the seeds on raised beds for growing seedling. 4)      Place the plants grown in polythene bags in beds prepared. 5)      Ensure that the bags have three to four holes for drainage. Make a mixture of soil (1part) + fine sand (1 part) + well decomposed compost (1 part). Fill the polythene bags with this mixture keeping 2 inch free space. 6) ...