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Chapter:

machine-tool-metrology

1. What is effect of axial slip in screw cutting?

Pitch will not be uniform Pitch will be uniform Pitch will be short Pitch will be high

Pitch will not be uniform

Due to axial slip, pitch will not be uniform in case of screw cutting. It is due to periodic movement of spindle. However this is not of so much importance while turning.

Hint Answer

2. What is anor name of axial play?

Full play Front play Back play End play

End play

Anor name of axial play is end play. End play is important especially on machines of high speed and it should be within prescribed limits. It is freedom of spindle moving in axial direction.

Hint Answer

3. How many reference gauges are measured for volumetric length measuring accuracy in CMM?

2 3 4 5

3

It is defined as difference between reference length of gauges, oriented freely and corresponding results from machine. 3 reference gauges are measured. Their lengths corresponding to approx. 1/3, 1/2 and 3/4 of full travel of longest axes.

Hint Answer

4. What is permissible error for internal taper for true running nearest to spindle nose?

0.02mm – 0.045mm 0.04 mm 0.01mm – 0.025mm 0.03 mm 0.1mm – 0.25mm 0.02 mm 0.0mm – 0.025mm 0.01 mm

0.01mm – 0.025mm 0.03 mm

Permissible error for testing internal taper for true running is 0.01 mm nearest to spindle nose and this permissible error is 0.025 millimeter at a distance of 300 millimeter.

Hint Answer

5. In how many planes, y test for parallelism of spindle axis with its vertical movement is performed?

In two planes 60° to each other In two planes 30° to each other In two planes 45° to each other In two planes 90° to each other

In two planes 90° to each other

The test for parallelism of spindle axis with its vertical movement is performed in two planes right angle to each or. The dial indicator is fixed on table with its feeler touching mandrel and test mandrel is fitted in tapered hole of spindle.

Hint Answer

6. In leveling of machine, which direction is more important in horizontal plane?

Longitudinal Transverse Both longitudinal and transverse Both longitudinal and transverse direction is not important

Both longitudinal and transverse

Both longitudinal and transverse directions are equally important in horizontal plane. It will produce a simple bend and undesirable stresses; if any long la bed is not installed truly horizontal n re will be a deflection in bed.

Hint Answer

7. What is cause of translational errors in CMM?

Error in scale division Error in straightness Twisting error Roll error

Error in straightness

Translational errors result from errors in division of scale and straightness error perpendicular to corresponding axis direction. Errors in scale division are known as positional errors. Error in straightness is cause of translational errors.

Hint Answer

8. Which type of CMM is most suited for large heavy workpieces?

Cantilever type Bridge type Horizontal boring mill type Floating bridge type

Horizontal boring mill type

Bridge type CMM is more difficult to load. It less sensitive to mechanical errors. Horizontal boring mill type is best suited for heavy and large workpieces. Highly accurate type is vertical bore mill type but is usually slower to operate.

Hint Answer

9. What is maximum error for Flatness of clamping surface?

0.1/1000 mm 0.1/100 mm 0.5/100 mm 0.01/1000 mm

0.1/1000 mm

The maximum error allowed for Flatness of clamping surface is 0.1/1000 mm clamping surface. The surface should be concave only for correct results.

Hint Answer

10. In testing of true running of spindle taper, what is position of dial indicator?

Dial indicator is fixed on the base Dial indicator is placed on the table Dial indicator is fixed on the sleeve Dial indicator is fixed on the table

Dial indicator is fixed on the table

For true running of spindle taper test, test mandrel is placed in tapered hole of spindle and a dial indicator is fixed on table and its feeler made to scan mandrel.

Hint Answer

Nexttt

All Chapters

View all Chapter and number of question available From each chapter from engineering-metrology

Linear Measurements

Linear Measurements

Standards of Measurements

Standards of Measurements

Limits, Fits and Gauges

Limits, Fits and Gauges

Comparators

Measurement by Light-Wave Interference

Measurement by Light-Wave Interference

Straightness, Flatness, Squareness, Parallelism, Circularity and Rotation

Straightness, Flatness, Squareness, Parallelism, Circularity and Rotation

Angular Measurement and Circular Division

Angular Measurement and Circular Division

Miscellaneous Measurements (EM)

Miscellaneous Measurements (EM)

Testing and Calibration of Gauges and Dynamic Measurement

Testing and Calibration of Gauges and Dynamic Measurement

Measurement of Surface Finish

Measurement of Surface Finish

Dial Indicators and Indicating Gauges

Dial Indicators and Indicating Gauges

Metrology of Screw Thread, Gauges for ISO Metric Screw Threads

Metrology of Screw Thread, Gauges for ISO Metric Screw Threads

Measurement and Testing of Gears

Measurement and Testing of Gears

Machine Tool Metrology

Machine Tool Metrology

Measuring Machines & Total Quality Management

Measuring Machines & Total Quality Management

Machine Vision Systems

Machine Vision Systems

Evaluating Uncertainty in Measurement

Evaluating Uncertainty in Measurement

Topics

This Chapter machine-tool-metrology consists of the following topics

Machine Tool Metrology

What is effect of axial slip in screw cutting?

What is anor name of axial play?

How many reference gauges are measured for volumetric length measuring accuracy in CMM?

What is permissible error for internal taper for true running nearest to spindle nose?

In how many planes, y test for parallelism of spindle axis with its vertical movement is performed?

In leveling of machine, which direction is more important in horizontal plane?

What is cause of translational errors in CMM?

Which type of CMM is most suited for large heavy workpieces?

What is maximum error for Flatness of clamping surface?

In testing of true running of spindle taper, what is position of dial indicator?

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