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Arm of a radial drilling machine is being raised at a speed of 3.9m/min by single start square threads of 6 mm pitch and 30mm diameter. The speed of the screw is a) 650 rpm b) 180 rpm c) 130 rpm d) cannot be determined?
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Arm of a radial drilling machine is being raised at a speed of 3.9m/mi...
Calculation of Speed of Screw in Radial Drilling Machine

Given:

  • Speed of raising arm = 3.9 m/min

  • Pitch of single start square threads = 6 mm

  • Diameter of screw = 30 mm



Calculation:


The linear speed of the arm is given by the formula:


Linear Speed = (π × Diameter × Number of revolutions) / (Pitch × Time)


The number of revolutions of the screw can be calculated as follows:


Number of revolutions = Linear speed × Pitch × Time / (π × Diameter)


Substituting the given values in the above formula, we get:


Number of revolutions = 3.9 × 6 × 60 / (π × 30) = 46.8 rpm


Therefore, the speed of the screw is 46.8 rpm.

Answer:


The correct option is d) cannot be determined.


Explanation:


The calculated speed of the screw is 46.8 rpm which is not given in any of the options. Hence, the correct option is d) cannot be determined.
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Arm of a radial drilling machine is being raised at a speed of 3.9m/min by single start square threads of 6 mm pitch and 30mm diameter. The speed of the screw is a) 650 rpm b) 180 rpm c) 130 rpm d) cannot be determined?
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