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Step 2Procedure
Making drill bits:
Take 3mm hardened screw and cut off its head.then use a smooth grinding machine to grind it as shown in the below picture.this step require little experience of grinding operation.
In the picture drill 2 is not good.it can make hole but the finishing of the hole will be bad.as its area increased from tip to the end .where as drill 4 has same area from tip to end.so with it u will get exact circular hole.
In the another picture u'll find different types of drills.(sorry for such bad pic i was in hurry so had use MS paint)
drill 1 has circular edge so u have to apply lot of force to drill hole where as its grinding is easy.
drill 2 has square edge.so there will be 4 cutting faces.with it u'll get good hole but its hard to grind.
same with drill 3 but instead of 4 it has 3 cutting edges.
so you have to experiment ,which one is good and suitable to you.
Take 3mm hardened screw and cut off its head.then use a smooth grinding machine to grind it as shown in the below picture.this step require little experience of grinding operation.
In the picture drill 2 is not good.it can make hole but the finishing of the hole will be bad.as its area increased from tip to the end .where as drill 4 has same area from tip to end.so with it u will get exact circular hole.
In the another picture u'll find different types of drills.(sorry for such bad pic i was in hurry so had use MS paint)
drill 1 has circular edge so u have to apply lot of force to drill hole where as its grinding is easy.
drill 2 has square edge.so there will be 4 cutting faces.with it u'll get good hole but its hard to grind.
same with drill 3 but instead of 4 it has 3 cutting edges.
so you have to experiment ,which one is good and suitable to you.
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