There are different types of milling cutters used in a milling machine. A suitable milling cutter is selected according to the need. They are
- Plain milling cutter
- Side milling cutter
- Metal slitting saw
- Angle milling cutter
- End milling cutter
- ‘T’ – Slot milling cutter
- Fly cutter
- Formed cutter
Plain Milling Cutter
Plain milling cutters are cylindrical in shape and have teeth on the circumferential surface only. They are used for producing flat surfaces parallel to the axis of rotation of the spindle. The teeth of the cutter may be straight or helical according to the size. If the width of the cutter is more, it is called as slabbing cutter or cylindrical milling cutter. They have a central hole in order to be mounted on the arbor. Plain milling cutters have nicked teeth to break the chips into small pieces. Helical plain milling cutters are superior to a straight plain milling cutter.
Side Milling Cutter
Side milling cutters have teeth on its periphery and also on one or both of its sides. They are intended for removing metal from the sides of the workpiece. There are different types of side milling cutters namely face and side milling cutter, half side milling cutter, staggered teeth side milling cutter, and interlocked side milling cutter. Machining is performed by selecting a proper milling cutter.
Metal Slitting Saw
It is intended for cutting narrow, deep slots and for parting off operation. The teeth are cut on the circumference of the cutter. The width of the cutter is limited. The outside diameter of the cutter will be upto 200mm and width of the cutter ranges from 0.75mm to 7mm. The side of the cutter is relieved so that the side may not rub against the work.
Angle Milling Cutter
The teeth of the angle milling cutter are not parallel to the axis but are at an angle to it. By using angle milling cutter, inclined surfaces, bevels and helical grooves are machined. There are two types of angle milling cutter – Single angle milling cutter and double angle milling cutter.
End Milling Cutter
These cutters have cutting teeth on the end as well as on the periphery of the cutter. It is made of two parts – body and shank. The shanks of the cutter may be straight or taper. If the cutter doesn’t have a shank it is called shell end milling cutter. These cutters are useful in machining long narrow slots, holes and flat surfaces.
‘T’ – Slot Milling Cutter
It is a special form of end mills intended for machining ‘T’- slots. It looks like a side milling cutter with a shank. The cutters have cutting teeth on the periphery as well as on both sides of the cutter.
Fly cutter is the simplest form of cutter. It consists of a single point cutting tool attached to the end of the arbor. The cutting edge may be formed to reproduce a contoured surface. They are used when standard cutters are not available. The work is done very slowly because of a single cutting edge.
Formed cutters have irregular profiles on their cutting edges to produce required outlines on the work. Concave and convex milling cutters are used to produce convex and concave surfaces respectively. Using gear milling cutters, gears are machined. Corner round milling cutters are used for cutting a radius on the edges of the work. With the help of thread milling cutters threads are milled to a specific form and size. Tap and reamer cutters are used for producing grooves or flutes in taps and reamers.