2. Introduction
jigs and fixtures are production work
holding devices used to manufacturing
sector.
a jig or fixture is designed and built to
hold, support, and locate every part.
A)Jig
B)Fixture
3. Jigs and Fixtures
Jigs Fixtures
Production tool that
locates, holds, and
Special device that holds,
supports the work securely
supports, or is placed on a
so the required machining
part to be machined.
operations can be
performed.
Fixtures vary in design from
it not only locates and
complicated devices.
holds the work piece but
Fixtures also help to simplify
also guides the cutting tool
metalworking operations
as the operation is
performed on special
performed.
equipment.
4. Objectives
Analyze part data to determine suitable jig
types to perform specified tasks
Specify locating, supporting and clamping
methods and details to suit sample parts
Design two plate type jigs to suit specified
sample parts and construct the required tool
drawings
5. 3K’s
Don’t Need to
Know
Know Know
Classify jigs Function of jigs Function of
and fixtures and fixtures open jigs
Usage in Characteristics Types of open
industrial of each jigs jigs
6. Overview of Open Drill Jigs
The work piece is placed on top and
widely exposed
Easily to be used.
Cheap in cost.
7. Various Types of Jigs
Table
Plate
Sandwich
Angle (Modified and Normal)
Template
8. Table Jigs
Table jig is plain plate jig with legs.
Main purpose is holding irregular or non-
symmetrical work pieces that cannot be held
in other plate jig forms.
The part is referenced by the surface being
machined rather than the opposite side.
Table jigs can accommodate almost any
shape work piece.
Limitations are the size of the part and
availability of clamping surfaces.
9. Sample of a Table Jig
The
part is clamped between jig plate and the
clamping device
10. Angle Jigs
Angle plate jigs are used to hold parts
that are machined at right angles to their
mounting locators.
A variation is the modified angle plate jig,
which is used for machining angles other
than 90 degrees.
Allow the drill to complete the hole .
avoid drilling the relieved portion of the
locator.
11. Sample of Angle Jigs
Additional clearance here would allow the drill to complete
the hole and avoid drilling the relieved portion of the locator.
12. Plate Jigs
plate jigs are basically modified or improve
template jigs.
while performing the same locating function
as template, they also incorporate a mean of
securing the part.
this added feature, clamping, is what allow
plate jigs to locate part with a high degree of
accuracy and repeatability.
plate jigs are actually a family of jigs rather
than a single type of tool.
13. Sample of Plate Jigs
It
is moveable on big plate type objects as a
guide.
14. Sandwich jigs
the sandwich jig is almost identical to a
plain plate jigs.
the only difference is the backup plate
found on the sandwich jigs.
this back up plate allows the jigs to hold
very thin part that could bend or distort
under tool pressure.
another use of a sandwich jig is as a
combination jig
16. Template Jigs
Template jigs are the simplest and most basic jig type used in
production
Guide for locating holes and contours or as a jig for low speed
production of accurate workpieces
Generally made without clamps and depend on pins nests or part
shapes to refrence them to the part.
Variation of template jigs
To accommodate the many types of parts.
Made to suit each part
Layout template
-used as a rapid refrence tool for laying out several identical parts
Used as for locating holes contours and external part details
Material used for templates is normally determined by the projected
tool life. Made from plastic or soft aluminium sheet.
17. Sample Of Template Jig
Thickness of material should be sufficient to maintain the proper
relationship between template elements
18. Conclusion
Open Jigs are convenient and simple.
Cheap to produce which is good for
economical reasons.
Suitable for home and industrial
