This set of Machine Tools Multiple Choice Questions & Answers (MCQs) focuses on “Milling Machine Basics – 2”.
1. Difficulty is experienced in pouring coolant just on the cutting edge from where the chip begins. This is the disadvantage of______ process.
a) upmilling
b) downmilling
c) can’t say anything
d) none of the mentioned
View Answer
Explanation: This is the disadvantage of upmilling. Use of cutting fluid is difficult in upmilling.
2. The work is pulled by cutter teeth and hence the job may get spoiled or breakaway. This is the disadvantage of _____ process.
a) upmilling
b) downmilling
c) can’t say anything
d) none of the mentioned
View Answer
Explanation: This is the disadvantage of downmilling.In downmilling, job and tool movements are in same direction.
3. As the cutter progress, the chip accumulate at the cutting zone, spoils the work surfaces. This is the disadvantage of ______ process.
a) upmilling
b) downmilling
c) can’t say anything
d) none of the mentioned
View Answer
Explanation: This is the disadvantage of upmilling. Cutter turns against the direction in which work is being fed.
4. Cutter teeth wears out soon as in the beginning itself the teeth comes in contact with the hard surface of the workpiece. This is the disadvantage of _______ process.
a) upmilling
b) downmilling
c) can’t say anything
d) none of the mentioned
View Answer
Explanation: This is the disadvantage of downmilling. Cutter turns in similar direction in which the work is being fed.
5. The burr on the surface cleans during the cutting operation. This is the advantage of _______ process.
a) upmilling
b) downmilling
c) can’t say anything
d) none of the mentioned
View Answer
Explanation: This is the advantage of downmilling. Its surface finish can be improved if it is free.
6. Upmilling is the process of removing metal by a cutter which is rotated _______ direction of the travel of the workpiece.
a) in the same
b) against the
c) can’t say anything
d) none of the mentioned
View Answer
Explanation: As per the definition of upmilling process. This upmilling process is also known as conventional process.
7. Downmilling is the process of removing metal by a cutter which is rotated _______ direction of the travel of the workpiece.
a) in the same
b) against the
c) can’t say anything
d) none of the mentioned
View Answer
Explanation: As per the definition of downmilling process.This downmilling process is also known as climb milling.
8. The thickness of the chip is ______ when the tooth begins its cut in downmilling.
a) maximum
b) minimum
c) zero
d) can’t say anything
View Answer
Explanation: The cutting force vary from maximum to zero in downmilling so at the starting thickness of chip is maximum.
9. The thickness of the chip is ______ when the cut terminates in downmilling.
a) maximum
b) minimum
c) zero
d) can’t say anything
View Answer
Explanation: From the working of downmilling, the cutting force vary from maximum to zero. So at the end thickness of chip is minimum.
10. For downmilling, _______ machines are used.
a) light
b) moderate
c) rigid
d) none of the mentioned
View Answer
Explanation: Rigid machines are used in this process so that no clamping difficulty is there in downmilling.
11. In downmilling, the machine must have fixed on it a backlash error eliminator.
a) true
b) false
View Answer
Explanation: As per the construction of this machine. This is done to make the forces strong enough on job to press down.
12. In downmilling, more springing actions are there in cutter.
a) true
b) false
View Answer
Explanation: This is false. In downmilling, less springing actions are there in cutter.
13. Narrow slots can be milled in _________ milling process.
a) upmilling
b) downmilling
c) can’t say anything
d) none of the mentioned
View Answer
Explanation: This is the advantage of downmilling process. In upmilling, it is difficult to mill narrow slots.
14. Downmilling is easily used on flexible, thin and flat jobs.
a) true
b) false
View Answer
Explanation: There is no clamping issue in downmilling. Use of cutting fluid is easy. Job and tool movements are in same direction. Due to this and many other advantages, downmilling is easily used on flexible, thin and flat jobs.
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