Manufacturing And Production Technology - Study Mode

[#181] In a CNC program block, N002 GO2 G91 X40 Z40......, GO2 and G91 refer to
Correct Answer

(C) Circular interpolation in clockwise direction and incremental dimension

Explanation

Solution: G02 – Circular interpolation in a clockwise direction G91 – incremental dimension

[#182] In an interchangeable assembly, shafts of size 25.000 -0.0100⁺⁰∙⁰⁴⁰ mm mate with holes of size 25.000 -0.010⁺⁰∙⁰²⁰ mm. The maximum possible clearance in the assembly will be
Correct Answer

(C) 30 microns

[#183] In determining the various forces on the chip, Merchant assumed that the
Correct Answer

(D) All of the above

Explanation

Solution: Assumption in Merchant's Force Circle: - The chip is considered in equilibrium under action of two equal and opposite collinear forces. -The stress is maximum at the shear plane and it remains constant. - The shear takes place in a direction in which the energy required for shearing is minimum

[#184] In order to achieve a specific surface finish in single point turning, the most important factor to be controlled is
Correct Answer

(B) Cutting speed

Explanation

Solution: In order to achieve a specific surface finish in single-point turning, the most important factor to be controlled is Cutting Speed other parameters will impact on the surface finish: -Minimize Deflection and Chatter, Keeping Tool Rigidity Up -Use Balanced Tooling to Reduce Vibration -Minimize Runout

[#185] The factor responsible for the formation of continuous chips with built up edge is
Correct Answer

(B) Low cutting speed and small rake angle

Explanation

Solution: -continuous chip with built up edge. a built up edge (BUE) is an accumulation of material against the rake face, that seizes to the tool tip, separating it from the chip
- Discontinuous chips are formed during machining of brittle metals while continuous chips with built up edge are formed during machining of ductile materials at low cutting speed