Jigs and Fixtures

The productivity and economics of machining workpiece in a large quantity is greatly affected with the use of tools and workholding devices like jigs and fixtures. These devices reduce the production cost and ensure interchangeability of machined workpieces.

They are defined as under:

Tool

It is a device which removes material from a workplace under stable conditions and gives it desired shape and size.

These may be of the following types:

a. Single-point tools.

b. Multiple-edge tools.

c. Non-mechanical or noncontact tools.

d. The press which is used to handle these tools itself is called machine tools.

Jig

It is a device which holds and locates a work piece and guides and controls one or more cutting tools.

Fixture

It is a device which only, holds and locates a workpiece during an inspection or for a manufacturing operation.


    


Types of Jigs and Fixtures

The type of jig and fixture totally depends on the type of work to be machined and its quality required. Some simple drill jigs are as below:

1. Template jig
2. Plate jig
3. Diameter jig
4. Channel jig
5. Ring jig
6. Box jig
7. Leaf jig

Advantages of Jigs and Fixtures

(i) They eliminate the marking out, measuring and other setting methods before machining.

(ii) They enable production of identical parts which are interchangeable.

(iii) They increase the machining accuracy of the workpiece.

(iv) They increase the production capacity of the man and machine.

(v) They reduce the operator's labour and consequent fatigue to him.

(vi) They enable semi-skilled operator to perform the operation, which saves the labour cost.

(vii) They minimize the expenditure on the quality control of finished products.

(viii) They reduce the overall cost of machining by fully or partly automatizing the processes.




Next Chapters

Estimating Procedure
Costing
Difference between Estimating & Costing
Depreciation & Obsolescence
Material Cost Calculation
Calculating Labor Cost
Direct and Indirect Expenses
Component Cost
Machine Shop Estimating
Forging and Forging Types
Starting an Organization
Welding Cost Estimation
Jigs and Fixtures
Forecasting
Qualities of an Entrepreneur
Starting Small Scale Industries
Budget and Budgetary Control
Supply & Law of Supply
Exchange and Barter Exchange
Classification of Market
Money and Types of Money
Trade Cycle
Break Even Analysis
Financial Management
Profit
Pricing
 


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