JIGS AND FIXTURES

1.  What is the function of jig bushes?

Drill bushes are used to guide drills, reamers and other cutting tools into the proper position on the work piece.

2.  What are the two types of press fit bushes?

a. Plain or headless bushes

b. Flanged or headed bushes

3.  Distinguish between the channel and box jigs.

In channel jigs, holes are drilled only in face but holes can be drilled on more than face using box jigs.

4.  What are the different types of jigs?

a. Plate jigs

b. Latch jig

c. Channel jig

d. Box jig

e. Angle plate jig

f.   Pot jig

5.  Define sandwich jig.

These jigs are a form of plate jig with a back plate. This type of jig is ideal for thin or soft parts that could bend or wrap in another style of jig. Here again, the use of buildings is determined by the number of parts to be made.

6.  What are the standard work holding devices in lathe?

a. Chucks

b. Collets

c. Face plate

d. Mandrels

7.  Mention any four essential features made on milling fixtures.

a. Base

b. Tenon strips

c.   Setting block

d. Locating elements

8.  List out the various locators used in fixtures.

a. Cylindrical locating pin

b. Diamond pin locator

c.   Screw and dowels

9.  Name any four essential features of a milling fixture.

a. Base

b. Locating elements

c. Setting elements

d. Tenon strips

e. Clamping element

10. What devices are mainly used to assemble modular elements?

Modular fixturing is a work holding system which uses a series of reusable standard components to build a wide variety of special purpose work holding devices. These types of fixtures are assembled with a variety of standard tooling plates, supports, locating elements, clamping devices and similar units.

11. What are the important elements of inspection fixtures?

a. Locating element

b. Clamping element

c.   Gauging element

d. Auxiliary element

12. What are the two types of inspection fixtures?

a. In-process inspection fixtures

b. Off-line inspection fixtures

13. State the use of grinding fixtures.

Several different forms of fixtures are used on grinding machines to locate, hold and support the work piece during the operations.

14. What are boring fixtures? How do you classify them?

This fixture which is used for cutting internal key-ways in pulleys, gears, sprockets, etc. is known as key way broaching fixture

15. What are the various machine tools used for boring?

a. Lathes

b. Drill presses

c.   Milling machine

d. Jig boring machine

e. Vertical or horizontal boring mills

16. State the classification of boring bars.

 a. Stub bar

 b. Single-piloted bar

 c.   Double-piloted bar

17. What are the different types of broaching operation?

a. Keyway broaching

b. Hole broaching

c. Gear broaching

18. What are fixtures?

Some type of tooling used in positioning parts relative to each other for fabricating purposes are commonly referred to as fixtures.

19. When slip bushes are used?

Slip bushes are mainly used when a hole in the work piece requires two operations. Ex: performing both drilling and reaming in a same jig plate.

20. What is the use of tack welding fixture?

Tack welding fixtures are used to locate the components of an element in their correct relationship with proper clamps while a welder tacks them together prior to their final welding.