Different types of jigs and there application

1. DIFFERENT TYPES OF JIGS
AND
APPLICATION
Submitted by:-
Shashank kapoor
154169

2. INTRODUCTION
• Jig are production work holding devices used to
manufacture duplicate parts accurately.
• They are special purpose tools used for large
scale production by semi skilled operator.
• They can also be used for small scale production
when interchangeability is important by skilled
machinist when the work piece is difficult to
hold without special equipment.

3. INTRODUCTION
They are used in industry:-
• To reduce cost of production
• To increase productivity
• To assure accuracy of component
• For mass production of component on its
repeatability basis
• For fully or partial automation of work
• To increase the versatility of the machine tool.
• To improve quality with greater machining accuracy

4. INTRODUCTION
• The term jig should be used only for devices
employed while drilling, reaming or tapping holes
• It is not fastened to the machined on which it is
used.
• So it may be moved around on the table of the
drilling machine to bring each bushing under the
drill
• It is not fastened to the drill press table for small
w.p, however holes above 0.25 mm inch in diameter
are to be drilled, it is usually necessary to fasten the
jig to the table securely.

5. COMPONENTS
To fulfill their basic functions, jigs should possess the
following components or elements:
1. A sufficiently rigid body (plate, box or frame
structure) into whichthe workpieces are loaded.
2. Locating elements.
3. Clamping elements
4. Tool guiding elements .
5. Elements for positioning or fastening the jig or
fixture on the machine on which it is used.

6. TYPES OF JIGS
DRILLING JIGS
Drilling jigs are used to machine holes in mechanical
products. To obtain positional accuracy of the holes,
hardened drill bushes or jig bushes are used to locate
and guide drill, reamers etc., in relation to the work
piece.

7. TYPES OF DRILLING JIGS
1. Template Jig
2. Plate Type Jig
3. Open Type Jig
4. Swinging Leaf Jig
5. Box Type Jig
6. Channel Type Jig
7. Sandwich Jig
8. Angular Jig
9. Angle Plate Jig
10. Pot Jig
11. Turn-over Jig
12. Diameter Jig
13. Multi-station Jig
14. Standard Jig
15. Universal Jig
16. Trunnion Jig
17. Ring Jig
18. Solid Jig
Template jig
• Simplest type of drilling jig.
• Simply a plate made to the shape and size of the work piece
with the required number of holes made in it accurately.
Place do the work piece and the holes in the work piece will
be made by the drill which will be guided through the holes in
the template.
• The plate should be hardened to avoid its frequent
replacement. This type of jig is suitable if only a few parts are
to be made.

8. DRILLING JIGS
Plate type Jig
• This is an improvement over the template type of jig. In place of simple
holes, drill bushes are provided in the plate to guide the drill. The workpiece
can be clamped to the plate and the holes drilled
Open type Jig

9. DRILLINGS JIGS
Box type Jig
• When holes are to be drilled in more than
one plane of a workpiece, the jig has to be
provided with equivalent number of bush
plates. For positioning the jig on the
machine table, feet have to be provided
opposite each drilling bush plate.
• One side of the jig will be provided with a
swinging leaf for loading and unloading the
workpiece. Such a jig would take the form
of a box.
• When, one or more sides of the box jig are kept open for loading/unloading, it is
known as Tumble type and Trunnion type box jig.

10. DRILLING JIGS
Sandwich Jig
• A sandwich jig is a modification of a plate type of jig. The plate jig has aback-
up plate. The job is held between the two plates. The jig is very useful for thin
and ductile jobs which might get bent or warped on another type of jig.
Diameter Jig
• These types of jigs provide
asimple means to drill or ream radial
holes on a diameter of cylindrical or
spherical jobs. The job can be located
on a V-block and clamped by a
clamping plate and a clamping bolt.

11. DRILLING JIGS
Angular Jig
• This type of jig is used when a hole is to be drilled at an angle to the drilling bush axis,
This type of jig is used to drill holes in collars and hubs of pulleys and gears etc. Fig.
refers to a drilling jig for drilling oil holes in an I.c. engine connecting rod.

12. DRILLING JIGS
Pot Jig
• This type of jig is used for drilling holes in circular components, which have both
internal and external diameters. The body of the jig is in the form of a pot. The
workpice is located in the pot of the jig and is properly clamped with the help of a post
type locating pin, a clamping plate and a clamping device.

13. DRILLING JIGS
Turnover Jig
• These jigs are used to drill holes in components having no suitable resting surfaces.They are
the modification of plate type jigs with jig feet. The jig feet provide the resting surfaces to
the jig during drilling. All such jigs should be "turned-over" for loading and unloading the
workpiece.
Multi-station Jig
• This type of jig has a circular indexable plate mounted on a circular3 base plate which is
clamped to the machine table with the help of T-bolts and nuts. Such jigs are used on multi-
spindle machines. Supposing, the indexable circular plate has four stations. On station 1,
drilling operation is being done, on station 2, reaming and on station 3, counter boring
operation is being done. Station 4 is used for loading and unloading of the jobs. After every
Set of operations, the circular plate is indexed by 90°.
Standard Jig
• There are many components that are similar in design, but different in dimensions
(cylindrical pins of same diameter, but of different lengths or cylindrical pins of different
diameters but of same length/different lengths, etc.) It is sometimes possible to drill several
of these different components in one jig. The jig incorporates an adjustable end locator to
accommodate a variety of lengths. When a jig is especially designed and fabricated for
several similar parts, it is called a standard jig.

14. DRILLINGS JIGS
Turnover Jig
• These jigs are used to drill holes in components having no suitable resting surfaces.They are the
modification of plate type jigs with jig feet. The jig feet provide the resting surfaces to the jig
during drilling. All such jigs should be "turned-over" for loading and unloading the workpiece.
Universal jig.
• This jig is fIrst manufactured as a basic unit (just like unit heads for machine tools) to which a
number of other elements and parts can be fItted to make it suitable for a specifIc job. Since
same basic unit can be adopted for different work-pieces and operations, simply by making
additions and alterations, hence, named "Universal Jig".
Trunnion jigs.
• The manual manipulation of heavy duty box type jigs is quite inconvenient and fatiguing. So,
such jigs are mounted on trunnions to bring the different faces of the workpiece to the
correct locations for drilling the holes.
Ring jig.
• Such a jig is suitable for drilling holes in round jobs, such as, flanges of pipes.
Solid jig.
• If holes are to be drilled in workpiece of simple shape and relatively of smaller size, then the
jig body can be fabricated from a standard section of rolled steel. Such a jig can be named as a
"solid Jig".

15. Thank you