Milling

Question 1

definition of milling

Answer 1

machining operation where a circular tool with multiple cutting edges rotates and cut a wide variety of surfaces, in particular prismatic pieces; the feed is held by the workpiece of by the tool.
Axis of rotation is perpendicular to the feed.

Question 2

forms of milling

Answer 2

1. peripheral milling:
   - surface parallel to cutter axis
   - cutting edges on the periphery of the cutter
2. face milling:
   - surface perpendicular to cutter axis
   - cutting edges both on end and outside the cutter

Question 3

end milling operation

Answer 3

face milling operation where the radial depth of cut is much lower then the axial one

Question 4

slotting operation

Answer 4

peripheral milling operation to obtain a slot

Question 5

types of milling machines

Answer 5

1. horizontal spindle
   - base
   - column
   - moving table
   - tool mounted on an arbor
2. vertical spindle
   - base
   - column
   - moving table
   - tool mounted on a head
3. bed-type milling machine
   - long bed
   - table
   - multiple spindles
4. CNC milling machine
   - moving spindle
   - moving table

Question 6

possible feed motion in slab milling

Answer 6

1. conventional: up milling
   - chip thickness increases during the cut
   - the cutter slides before the cut, causing wear and heating
   - possible vibrations due to vertical load on the fixtures
2. climbing: down milling
   - chip thickness decreases during the cut
   - initial shock may cause the fracture of the tool
   - vertical load on the table
   - horizontal force in the same direction of the feed causes a lot of vibrations. this problem can be solved using pre loaded screw balls