A Machine Shop Requires a Specific Hardness Range on Purchased

question 36

Essay

A machine shop requires a specific hardness range on purchased iron blocks.A machine is used to test the hardness.To be acceptable,the hardness readings need to be between a UTL of 366 and an LTL of 335.The supplier reports that the mean hardness is 350,with a standard deviation of 7.The Z-score is 2.33 for a defective rate of less than 1%.What standard deviation is required if the UTL is used to compute the process sigma?

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Definitions:

Control Coils

Electromagnetic coils used within devices like relays and contactors to control the opening and closing of circuits.

Momentary-Contact

Momentary contact refers to an electrical switch or relay contact designed to close or open a circuit briefly, usually for as long as the actuating mechanism is held.

Jog Circuit

A control circuit method used to momentarily energize a motor or device, allowing for short movements or adjustments without continuous operation.

Jog Function

A control feature that enables a brief activation of a motor to adjust its position without initiating a full start cycle.