Chapter 24

Question 1

Milling

Answer 1

A surface is generated by progressive chip removal. Multiple tooth tools are typically used

Question 2

Milling cutter

Answer 2

The cutting tool in milling.

Question 3

Interrupted cutting

Answer 3

Equally spaced peripheral teeth will intermittently engage and machine the workpiece.

Question 4

Milling categories

Answer 4

Peripheral milling, end milling, and face milling.

Question 5

Peripheral milling

Answer 5

The surface is generated by teeth located on the periphery of the cutter body. Surface parallel with the axis of rotation of the cutter

Question 6

Slab milling

Answer 6

Performed on horizontal spindle milling machines.

Question 7

Fm

Answer 7

Table feed rate in inches per minute

Question 8

Feed per tooth

Answer 8

Fc

Question 9

Width of cut

Answer 9

The width of the cutter or the work, in inches, designated by a W.

Question 10

Face milling and end milling

Answer 10

The generated surface is at right angles to the cutter axis.

Question 11

Face milling

Answer 11

Done on both horizontal and vertical spindle machines. Mainly the end surface of a milling cutter is used to create a flat surface.

Question 12

End milling

Answer 12

Cutter can cut on both the sides and ends of the tool.

Question 13

Horsepower

Answer 13

The maximum amount of material that can be removed per pass is usually limited by the available power.

Question 14

If machine power is lacking for milling do:

Answer 14

1 use a cutter with a positive rake as this can be more efficient. 2 use a cutter with a coarser pitch. 3 use a smaller cutter and take several passes.

Question 15

Up milling

Answer 15

Called conventional milling as it is a traditional method of milling. The cutter rotates against the direction of feed of the workpiece.

Question 16

Climb milling

Answer 16

Called down milling. The cutter rotation is in the same direction as the feed rate.

Question 17

Chip formation in uo milling

Answer 17

Chip is very thin at the beginning, then it increases in thickness. It is maximum where the tooth leaves the work.

Question 18

Cutter in up milling

Answer 18

Éliminates the effect of looseness in the feed screw and nut of the milling table, but increases looseness in the work from the fixture so greater cramping forces are needed. Chips can cause surface finish to be poorer.

Question 19

Down milling chip thickness

Answer 19

Maximum thickness cours close to the point of contact between tool and work. Pulls the workpiece into the cutter, must elongate looseness in the feed screw. This cutting process is smoother with a greater surface finish.

Question 20

Milling surface finish

Answer 20

An interrupted cutting process. Positive rake angles tend to life the workpiece, while negative takes compress the workpiece.

Question 21

Column and knee construction

Answer 21

Most basic milling machines are of this construction.

Question 22

Column

Answer 22

The column is the main supporting frame for all parts and contains the spindle with the driving mechanism. Provides motion in three mutually perpendicular directions: 1 through the knee, moving on the ways. 2 through the saddle, moving transversely on the ways of the knee 3 through the table.

Question 23

Ram type milling machine

Answer 23

Most versatile and popular milling machines, using the knee and Colin design. Suitable for light duty milling drilling reaming and so on.

Question 24

The ram

Answer 24

Supports the head and permits positioning of the spindle with respect to the table.

Question 25

Bed type milling machines

Answer 25

Has ruggedness and the capability of making heavy cuts with versatility. Table is mounted directly on the bed and only had longitudinal motion.

Question 26

Bed type milling machine skill required

Answer 26

After set up, little skill is required to operate them, permitting faster learning time.

Question 27

Simplex milling machines

Answer 27

Bed type milling machines with single spindles. They are made with both horizontal and vertical spindles.

Question 28

Duplex and triplex type

Answer 28

Bed type machines made with two or three spindles.

Question 29

Some milling machines are equipped with what

Answer 29

Automatic controls so that the operator only had to load and unload the workpiece into the fixture

Question 30

Stand alone machines

Answer 30

A fixture can be located at each end of the table so that one workpiece can be loaded while another is machines