Page 63

Preview Taipei International Machine Tools Show

Introduction to Jigs and Fixtures Whilst both jigs and fixtures hold, support and locate a workpiece, fundamental differences exist in their correct definition and utilization. For a manager of a metal working

the two. Both jigs and fixtures hold,

clamped manually or automatically by

production shop, the critical know-how

support and locate the workpiece. A jig,

vacuum suction, hydraulic power or

about high productivity with the highest

however, guides the cutting tool and a

magnetically.

efficiency is not just which machine

fixture references it. The differentiation

Designing a multi-station fixture

tools are selected but also the jigs and

between these two types of workholders

for precision parts requires unique

fixtures designed to be incorporated

is in their relation to the cutting tool.

e x p e r t i s e i n m e t a l l u r g y, t o o l i n g ,

with the machines. It is said that the

There are two general types of jigs.

cutting strategies and even machine

real secret weapon of making good

“Open jigs” are simple and only used on

structures. The challenging point is

profit relies on the cutting tools together

one side of the part. “Closed jigs”, or

how to provide proper clamping force

with jigs and fixtures, not the machines

so-called “box jigs” are used when the

at the right position without deforming

themselves. In some cases, the jigs

machining is done on more than one

the workpiece and without interfering

and fixtures are considered as the most

side. Fixtures are classified according

in the cutting path. The efficiency

confidential equipment in a factory.

to the machine on which they are

and accuracy performed by the fixture

Jigs and fixtures are production

used. For example, a fixture designed

tremendously affects the cost of parts.

workholding devices. They are closely

for use on a machining center is a

The technology of producing a car is

related and often the terms "jigs"

milling fixture and for use in a welding

well-known. The threshold is how to

and "fixtures" are confused or used

process is a welding fixture. Different

mass produce within an acceptable cost,

interchangeably. However, there are

types of fixtures such as plate, angle-

and that cost is often decided by the

clear distinctions between these two

plate, vise-jaw, indexing, multi-station

efficiency of the machining processes.

tools. Although many people have their

and profiling are commonly seen in the

Eventually it is the humble fixture that

own definitions for a jig or a fixture, there

workshop. Depending on the required

makes the difference!

is one universal distinction between

job efficiency, the workpieces can be

Image Courtesy: SY

65

Show Preview of Taipei Int'l Machine Tool Show (TIMTOS 2013)  

TIMTOS 2013 will be held next March, from the 5th to 10th. It will be one of the biggest showcase on mahine tool products in Asia.

Show Preview of Taipei Int'l Machine Tool Show (TIMTOS 2013)  

TIMTOS 2013 will be held next March, from the 5th to 10th. It will be one of the biggest showcase on mahine tool products in Asia.

Advertisement