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Monday, 21 July 2014

Milling Machine Cutter Angles

Milling Machine Cutter Angles Points : Milling Machine Cutter Angles Milling cutter is give by a rake, clearance angles with other cutting angles for capable taking away of chips. Various angles give on cutters are given below. 1. Clearance Angle There are two types of clearance angles on milling cutter
a. Primary Clearance Angle
b. Secondary Clearance Angle
a. Primary Clearance Angle It is the angle among the surface of a land with a tangent to margin at cutting edge. It is give on the cutter to stop the back of tooth as of rubbing against the job. Depending upon size of cutter, the primary clearance angles vary as of 30 to 12°. b. Secondary Clearance Angle It is the angle created through the secondary clearance surface of tooth with the tangent to periphery at the cutting edge. It is generally 3° greater than clearance angle. 2. Rake Milling cutter so ground to the surface beside which the chips bear, as being served, incline in such a method to the eagerness of cutting edge increases.
Rake angles are classify as
a. Zero
b. Positive
c. Negative
a. Zero As radial line and tooth face match, the cutter is supposed to have a zero rake. b. Positive If face and tooth of cutter are on similar side of radial line, the cutter is supposed to have positive rake. c. Negative If face of tooth and tooth corpse are on conflicting sides, the cutter is supposed to have a negative rake. 3. Relief Angle Relief angle between land of tooth and tangent to the outside diameter at cutting edge. 4. Axial Rake Angle Line among the line of the tangential cutting edge and the axis of cutter. 5. Helix Angle The preference of helical curve relative to its axis. 6. Lip Angle The included angle between land and face of tooth.

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