Engineering Metrology Questions and Answers – Alignment Tests on Pillar Type Drilling Machine

This set of Engineering Metrology Questions and Answers for Entrance exams focuses on “Alignment Tests on Pillar Type Drilling Machine”.

1. How Flatness of clamping surface of the base test is performed?
a) By placing a straight edge on one gauge block
b) By placing a straight edge on four gauge blocks
c) By placing a straight edge on two gauge blocks
d) By placing a straight edge on three gauge blocks

Explanation: The Flatness of clamping surface test is performed by placing a straight edge on two gauge blocks on the base plate in various positions and the error is noted down by inserting the feeler gauges.

2. What is the maximum error for Flatness of clamping surface?
a) 0.1/1000 mm
b) 0.1/100 mm
c) 0.5/100 mm
d) 0.01/1000 mm

Explanation: 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.

3. How perpendicularity of drill head guide to the base plate is performed?
a) By placing the frame level with graduations from 0.03 to 0.05 mm/m on spindle table
b) By placing the frame level with graduations from 0.05 to 0.1 mm/m on guide column
c) By placing the frame level with graduations from 0.05 to 0.1 mm/m on spindle table
d) By placing the frame level with graduations from 0.03 to 0.05 mm/m on guide column

Explanation: The perpendicularity of drill head guide to base plate test is performed by placing the frame level (with graduations from 0.03 to 0.05 mm/m) on guide column and base plate and the error is noted by noting the difference between the readings of the two levels.

4. In the perpendicularity of drill head guide to base plate test, what is the position of guide column?
a) Inclined at the upper end towards the front only
b) Declined at the upper end towards the front only
c) Inclined at the upper end towards the back only
d) Declined at the upper end towards the front only

Explanation: The error should not exceed 0.25/1000 mm guide column for a vertical plane passing through the axes of both spindle and column and the guide column should be inclined at the upper end towards the front only, and 0.15/1000 mm for a horizontal plane passing through the axes of both spindle and column.

5. What is the maximum error for perpendicularity of spindle sleeve with a base plate?
a) 0.15/1000 mm for plane vertical to plane passing through the axes of both spindle and column
b) 0.15/1000 mm for plane horizontal to plane passing through the axes of both spindle and column
c) 0.5/1000 mm for plane vertical to plane passing through the axes of both spindle and column
d) 0.5/1000 mm for plane horizontal to plane passing through the axes of both spindle and column

Explanation: The error should not exceed 0.25/1000 mm for plane vertical to plane passing through the axes of both spindle and column and the sleeve should be inclined toward column only ; and 0.15/1000 mm for plane horizontal to plane passing through the axes of both spindle and column.
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6. In testing of the true running of spindle taper, what is the position of dial indicator?
a) Dial indicator is fixed on the base
b) Dial indicator is placed on the table
c) Dial indicator is fixed on the sleeve
d) Dial indicator is fixed on the table

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

7. What is the error for the true running of spindle taper for machines with taper larger than Morse No. 2?
a) 0.03/100
b) 0.01/100
c) 0.04/300
d) 0.04/100

Explanation: The error for the true running of spindle taper should not exceed 0.04/300 mm for machines with taper larger than Morse No. 2 and 0.03/100 mm for machines with taper upto Morse No. 2.

8. In how many planes, they test for parallelism of the spindle axis with its vertical movement is performed?
a) In two planes 60° to each other
b) In two planes 30° to each other
c) In two planes 45° to each other
d) In two planes 90° to each other

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

9. For testing squareness of spindle axis with table, when was reading taken down?
a) At every 90° rotation of spindle
b) At every 180° rotation of spindle
c) At every 60° rotation of spindle
d) At every 120° rotation of spindle

Explanation: The dial indicator is fixed in the spindle tapered hole and its feeler touch the straight edge At A and then, reading is noted down. The spindle is rotated by 180° so that the feeler touches at point A’ and again reading is noted down.

10. What is the permissible error for squareness of spindle axis with table test?
a) 0.05/300 mm
b) 0.08/300 mm
c) 0.1/300 mm
d) 0.01/300 mm

Explanation: The difference of two readings gives the error in squareness of spindle axis with table. The permissible errors are 0.08/300 mm with lower end of spindle inclining towards column only to first plane and 0.05/300 mm for plane perpendicular to the previous plane.

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