Final answer:
Whether the machine tool's 5 hp motor with 85% efficiency has sufficient power for a machining cut depends on the required power, which is not provided, but most critically on the type of material being machined as tougher materials will have higher power requirements. Option c is the correct answer.
Step-by-step explanation:
To determine whether a machining operation can be carried out by a given motor, we need to assess if the motor has sufficient power to perform the task. The power requirement for machining is a factor of the chip load, which is a product of the feed rate and depth of cut, as well as the material's properties and the cutting speed that must be maintained for a given tool life.
The formula to estimate the power required for cutting can be written as:
Power (hp) = (Force (lbs) x Cutting Speed (ft/min)) / (33,000).
Now, without the specific material properties and the cutting force, we cannot determine the exact power required. However, we are provided with the mechanical efficiency of the motor which is 85%. This means that the actual power that can be utilized for cutting is only 85% of the motor's rated power. Therefore, the usable power from a 5 hp motor is:
Usable Power (hp) = 5 hp x 0.85 = 4.25 hp.
Even without knowing the specific power requirement for the job, we can infer the following:
- If the required power for the cutting operation is less than or equal to 4.25 hp, then the motor will have sufficient power to perform the task.
- If the power required exceeds 4.25 hp, the motor will lack the power required and the operation cannot be performed safely or effectively.
- The required power is heavily dependent on the type of material being machined, as tougher materials will require more power for the same cutting conditions.
Therefore, based on the information provided, the correct answer would be:
(c) It depends on the material being machined.