DRILLING PROCESS TYPES|PART-1



Drilling 

It is a cutting process
a drill bit is used to cut a hole of circular cross-section in solid materials.
The drill bit is usually a rotary cutting tool, and a multi-point cutting tool.
The drill bit is pressed against the workpiece and rotated at rates from hundreds to thousands of revolutions per minute.
This forces the cutting edge of the workpiece, thus cutting off chips (swarf) from the hole as it is drilled.

Reaming

Reaming is widening a hole with a special tool.
A reamer is a type of rotary cutting tool used in metalworking.
reamers are designed to enlarge the size of a previously formed hole by a small amount but with a high degree of accuracy to leave smooth sides.

 Types of the reamer.
1.Straight reamer.
A straight reamer is used to make only a minor enlargement to a hole. The entry end of the reamer will have a slight taper, the length of which will depend on its type.

2.Hand reamer: -A hand reamer has a longer taper or lead in at the front than a machine reamer. This is to compensate for the difficulty of starting a hole by hand power alone. It also allows the reader to start straight and reduce the risk of breakage. The flutes may be straight or spiral.

3.Machine reamer: -Machine reamer only has a very slight lead in. Because the reamer and work piece are pre-aligned by the machine there is no risk of it wandering off course.
4.Shell reamer: -Shell reamers are designed for reaming bearing and other similar items. They have fluted almost their whole length.

5. Taper reamer: -A precision tapered reamer is used to make a tapered hole to later receive a tapered pin. 

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