Transfer Caliper – Construction and Uses

In the ITI Turner trade, accurate measurement and transfer of dimensions are essential for producing precise components. In certain situations, direct measurement using standard tools is not possible due to obstruction or limited space. In such cases, a transfer caliper is used. This chapter explains the construction, working, and uses of the transfer caliper in detail.

Introduction to Transfer Caliper

A transfer caliper is a special type of caliper used to transfer measurements from one place to another, especially where direct measurement is difficult. It is commonly used in machining and fitting operations.

It allows accurate measurement of internal or external dimensions even in restricted areas.

Construction of Transfer Caliper

The transfer caliper consists of the following main parts:

• Main Legs: Two legs used for measuring
• Transfer Arm: Additional arm that helps in transferring measurement
• Pivot Joint: Connects the legs and allows movement
• Adjusting Screw: Used for fine adjustment
• Locking Screw: Holds the measurement in position

The transfer arm is the key feature that distinguishes it from ordinary calipers.

Working Principle

The transfer caliper works by setting the measurement at the required location and then transferring that measurement to a measuring tool such as a steel rule or micrometer.

The transfer arm allows the caliper to be removed from the workpiece without disturbing the measurement.

Types of Transfer Calipers

• Inside Transfer Caliper: Used for internal measurements
• Outside Transfer Caliper: Used for external measurements

Uses of Transfer Caliper

• Measuring dimensions in restricted areas
• Transferring measurements to other instruments
• Checking internal and external sizes
• Used in fitting and machining work

Advantages

• Useful in inaccessible locations
• Maintains measurement accuracy
• Simple and easy to use

Limitations

• Does not provide direct reading
• Requires additional measuring tools

Precautions While Using Transfer Caliper

• Ensure proper locking of measurement
• Avoid excessive force
• Handle carefully to prevent damage
• Check alignment before use

Maintenance of Transfer Caliper

• Keep clean and dry
• Lubricate pivot joints
• Store properly
• Avoid rust and corrosion

Application in Turner Workshop

In the Turner trade, transfer calipers are used when direct measurement is not possible due to obstruction or complex shapes. They help in transferring accurate measurements for further processing.

They are commonly used in fitting, assembly, and inspection work.

Difference Between Ordinary and Transfer Caliper

Importance in Measurement

• Ensures accurate transfer of dimensions
• Improves measurement flexibility
• Useful in complex machining tasks

Conclusion

The transfer caliper is a useful measuring tool in the ITI Turner trade, especially for transferring dimensions from inaccessible areas.

Understanding its construction and uses helps trainees perform measurement tasks accurately.

In conclusion, proper use of transfer caliper ensures precision and efficiency in machining operations.