Question

A cylinder liner is manufactured by first casting a hollow cylinder and then machining it on the inner and outer surfaces, as well as the two ends of the hollow cylinder. You have been given the responsibility to manufacture a liner with following final dimensions:

ID: 90 mm
OD: 100 mm
L: 200 mm

The casting required to make this liner should have 5 mm machining stock on ID and OD and 15 mm machining stock on length. The foundry cost for making the casting is Rs. 45 per kg of casting weight. Machining cost is Rs. 50 per liner and the value of scrap recovered during machining is Rs. 18 per kg. One-time machine setup cost of Rs. 10,000 is incurred every time a batch of this liner is produced. What is the unit cost of producing a batch of a) 500 liners, and b) 1500 liners.

Hint: Machining stock on a casting refers to extra material added in the areas that will require machining after the casting is poured. Machining is simply the removal of material to make the part meet the final dimensions. As you can guess, to machine a casting there must be excess material there to be removed. If there is no excess material whatsoever, then machining simply cannot be performed​

Answer 1

Answer:

cylinder liner is a cylindrical part to be fitted into an engine block to form a cylinder. It is one of the most important functional parts to make