Sand preparation and Sand mould making procedure
Posted by Vishnu on April 15th, 2010 07:22 PM | 1 Comment
5.4.7 Sand preparation
One of the important requirements for the preparation of sand is through mixing of its various ingredients. This is essential to ensure uniform distribution of the various components in the entire bulk of sand.
During the mixing process any ...
Trepanning
Posted by Vishnu on April 15th, 2010 05:18 PM | No Comment
9. Trepanning
Trepanning is done when a fairly large hole has to be cut in this material. The trepanning cutter instead of cutting away all the metal hole, removes a thin annulus of metal. This leaves a clean cut hole in ...
Grinding
Posted by Vishnu on April 15th, 2010 05:17 PM | No Comment
8. Grinding
A hardened hole may be sized and finished with the help of grinding operation performed on a drill press. Grinding wheel may be attached with the drill spindle and the rotating grinding wheel is fed into the hardened hole ...
Tapping
Posted by Vishnu on April 15th, 2010 05:16 PM | No Comment
7. Tapping
It is the operation done for forming internal threads in a drilled hole This is done by means of a tool called tap. For tapping the size of the hole to be made through drilling has to be smaller ...
Spot Facing
Posted by Vishnu on April 15th, 2010 05:14 PM | No Comment
6. Spot Facing
The operation used for squaring and finishing the surface around and at the end of a hole is known as spot facing. It is done to provide a smooth and true seat to the underside of bolt heads, ...
Counter Sinking
Posted by Vishnu on April 15th, 2010 05:10 PM | No Comment
5. Counter Sinking
It is the operation used for enlarging the end of a hole to give it a conical shape for a short distance. This is done for providing a seat for the counter sunk heads of screw, so that ...
Counter Boring
Posted by Vishnu on April 15th, 2010 05:08 PM | No Comment
4. Counter Boring
The operation used for enlarging only a limited portion of the hole is called counter-boring. Unlike a boring tool, the counter-boring tool has a pilot on guide that goes into the already existing hole and thus maintains the ...