Gear Cutting

Question 1

What are certain KEY FUNCTIONS that gears do?

Answer 1

REVERSING THE DIRECTION OF ROTATION, ALTERING THE ANGULAR ORENTATION OF ROTARY MOTION, CONVERT ROTARY MOTION INTO LINEAR MOTION (and vice versa) , and to alter GEAR SPEED RATIO

Question 2

What are the two types of methods of MACHINING GEARS?

Answer 2

GEAR GENERATING & GEAR FORM CUTTING

Question 3

The methods to mahcine gears can also do what?

Answer 3

Do FINISHING

Question 4

Describe the process of GEAR GENERATING?

Answer 4

It is done by the relative mation of the gear cutting tool and the generating mation(or rottion) of the workpiece

Question 5

What are the PRIMARY gear generating processes?

Answer 5

HOBBING AND SHAPING

Question 6

Describe the process of HOBBING.

Answer 6

Gear teeth are progresively generatted by a a series of cuts using a HOB. Where the HOB and workpiece are roatating but the HOB is being axially fed across the face of the blank

Question 7

What is gears does HOBBING create?

Answer 7

Spur gears, helical gears, and many special gear forms

Question 8

What is the main limitation of HOBBING?

Answer 8

Can only be used to craete external gears

Question 9

Describe the process of GEAR SHAPING.

Answer 9

The workpiece rotates in contact with a reciprocating cutter

Question 10

What are the types of reciprocating cutters used for GEAR SHAPING?

Answer 10

PINOIN SHAPED CUTTER, MULTI TOOTH RACK SHAPED CUTTER, and SINGLE POINT CUTTER

Question 11

What cutter was used to create staright teeth on a gear?

Answer 11

A PINION SHAPED CUTTER

Question 12

How is the process of GEAR SHAPING done with a RACK SHAPE CUTTER?

Answer 12

Typical has 6-12 teeth that reciprocate in the gear blank and once its done cutting throughit disengages and returns to its starting point to begin another cut

Question 13

How is SHAPING done with a SINGLE POINT CUTTER?

Answer 13

The cutter reciporcates to make succesuvely deeper cut until the predetermined depth is reached

Question 14

What types of gears do GEAR SHAPERS mainly make?

Answer 14

Internal gears, shoulder gear, and many other gear types that HOBBING cannot produce, as well as non enveluped shape such as a cam and gear on the same shaft

Question 15

What is GEAR FORM CUTTING and the TOOL used?

Answer 15

Uses formed tooth cutters that have the desired shape(or profile)

Question 16

What are the 2 types of GEAR CUTTING?

Answer 16

BROACHING & MILLING

Question 17

Describe the BROACHING PROCESS and why is it used?

Answer 17

The BROACH and the gear blank are pushed or pulled relatively to each other to quickly remove material and is used since its the fasts method to machine gears

Question 18

Why would you do normal BROACHING?

Answer 18

To create internal gears

Question 19

Describe the process of POT BROACHING.

Answer 19

Performed on a speciall machine tool that has a hollow broaching tool asssembly called a POT and the gear blanks are either pushed down, pushed up, or pulled up through the pot to create the external gear teeth

Question 20

Describe MILLING used in the video

Answer 20

Uses the reltive motion between a multi edge cutter and workpiece to generate shapes and usually mill each gear tooth individually

Question 21

Describe GASHING and why its used

Answer 21

Used to create produce large corse pitch internal or external spur or helical gears.It involves plunging the the rotating cutting into the blank to rapidly remove metal

Question 22

What are the 2 processes that can be done after SHAPING/CUTTING a gear?

Answer 22

HEAT TREATMENT to create the required hardnness and FINISHING which is done to nullify any distortion