NUST

Production Tooling & Automation Project

SUBMITTED TO:

SIR REHAN AHMED KHAN

SUBMITTED BY:

NS ZULKEEFAL DAR (170)

NS M.TALAL JAMEEL (143)

NS SUFYAN AWAN (155)

NS M.TAHA SAFDAR (142)

NS USAMA WAHEED (164)

DE-32 (MECHANICAL ENGINEERING) SYNDICATE : B

JIG:

A jig is a device to which a component is fastened for a specific operation in such a way that it

will guide one or more cutting tools to the same position or any number of similar components

which may be used upon it.

PROJECT OBJECTIVE:

Our project is to design a Jig for below mentioned part for mass production of drilling

operation.

DESIGN:

The main function of a jig is to support and hold the part on which machining has to be

performed. Degrees of freedom of the part is restricted by using different locators. To hold the

part at a specific position during machining, a clamping force is applied through clampers. The

details of these location and clamping devices is given below

LOCATION:

The locating system must (in conjunction with the clamping system) completely constrain the

work piece to perform the required operation with accuracy. We have used four flat locators

for support and four more flat locators for profile grabbing to restrict all degrees of freedom

except the required motion in vertical direction for loading and unloading the component.

More over two of these locators are also provided with threads to be used in clamping

mechanism as well. This integration of location and clamping will result in compact design for

jig.

CLAMPING:

The purpose of clamping system is to hold the work piece against cutting forces and torques

without causing any damage to it. To avoid any damage to the part, clamper is applied at thick

sections of the work piece and the contact surfaces of drill plate are rounded as shown in figure

This clamper design can easily incorporate small changes in work piece drilling area, height due

to threaded nuts.

TOOL GUIDING:

Drilling tool can be guided directly by the plate but to increase the life of the drilling plate, we

have designed a case hardened steel bush which will fit in the drilling plate as shown in

following figure.

ERGONOMICS:

To make sure the safe handling of the jig during machining operations, we have avoided any

sharp edges in the design and a worker can easily perform the drilling operation.

ALLOWANCES:

The width of drilling plate is less than the distance between the work piece slanted edge and its

ending edge. This arrangement will facilitate the clamping of work pieces which are not

dimensionally accurate on the slanting edge. Moreover, our clamper design will incorporate the

slight changes in the drilled area height.

FINAL DESIGN:

The finalized design with all the components is shown below in figure