Indexing Drill Jig

Parmeshwar NagrePrashant BadakHarsh RawlaniSomesh Patil

F.E. (Mechanical) 2014

Under the guidance of

Prof. N. K. Patil

DRILL JIG:A jig guides the tool during an operation in addition to locating and supporting the work piece

PURPOSE AND ADVANTAGES OF JIGS: It reduces or sometimes eliminates

the efforts of marking, measuring setting of work piece on a machine

It maintains the accuracy of performance

The work piece and tool are relatively located at their exact positions before the operation automatically within negligible time thus reducing product cycle time

The operating conditions like speed, feed rate and depth of cut can be set to higher values due to rigidity of clamping of work piece by jigs

Semi-skilled operators can be assigned the work

Different types of jig: 1.Template Jig

2.Open type jig

3. Box type jig

4.Index jig

INDEX JIG:This jig is used for quick drilling of equidistant holes on the circular surface of the work piece. By means of indexing device a hole is drilled then the work piece is moved (indexed) to next position under the drill bush for drilling automatically.

IMPORTANT CONSIDERATIONS WHILE DESIGNING JIGS

1. Study of work piece and finished component size and geometry

2. Type and capacity of the machine, its extent of automation

3. Provision of locating devices in the machine

4. Available clamping arrangements in the machine

5. Available indexing devices, their accuracy

6. Evaluation of variability in the performance results of the machine

7. Rigidity and of the machine tool under consideration

8. Study of ejecting devices, safety devices, etc.

9. Required level of the accuracy in the work and quality to be produced

PRINCIPLES OF LOCATIONS The location refers to the establishment of a desired relationship between the work piece The jigs are desired to restrict all undesirable movements of the work piece

DIFFERENT METHODS USED FOR LOCATION Flat locators are used for location of flat machined surfaces of the component A cylindrical and conical locator is used for locating components having drilled holes Jack pin locator is used for supporting rough work pieces from the button Vee locators is used for locating the circular and semi-circular type of work pieces

PRINCIPLES OF CLAMPING To restrain the work piece completely a clamping device is required in addition to locating device and jigs and fixtures. The clamping pressure should be enough to over come the operating pressure applied on the work piece without damaging it It should also be user friendly i.e. clamping and releasing should be easy and less time consuming

DIFFERENT METHODS USED FOR LOCATION Heel Clamp Bridge Clamp Latch Clamp Screw Clamp

Thanks

National Science Day to mark the discovery of the Raman effect 

by Indian physicist Sir Chandrasekhara Venkata Raman on 28 February 1928