Answer / mitul

118*

Answer / rohit mathanker

there is four angle use in twist drill
1 cutting angle it is 118 is quite common but very 80 to
140 degree soft material required large value of it wherse
hard material required low value.

2 lip clearance angle its value varies 8 to 14

3 rake angle it is large for hard material because for
removeing the chip and small for hard material

Answer / prithwish

118*

Answer / rohit mathanker

90* angle use for bekelite hard plastic.
118* for cast iron
120 for mild steel

Answer / prithwish

yes

Answer / kiran

is cutting angle and point angle same???????
i think cutting angle is angle made by cutting edge to work
surface.. then how will 118 becomes cutting angle?

Answer / chaitanya pithawa

we cant say from this,because for every material the angle
is different and there is 3 angle of twist drill.
118 is point angle for bronze and cast steel and for
Al,Brass and SS,118 is the min no. of the point angle.

Answer / andy

118

Answer / rrb

60 ○

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