Question

In Computer Aided Quality Control (CAQC), the coordinate measuring machine

• A. Uses radiation techniques
• B. Is a scanning laser beam device
• C. Is a noncontact inspection method
• D. Is a contact inspection method

Hint:

A Coordinate Measuring Machine (CMM) in CAQC typically uses a contact probe to measure a workpiece’s geometry, making it a contact inspection method.

Answer 1

The Correct Option is D

Step 1: Understand Coordinate Measuring Machines (CMM) in CAQC.
A Coordinate Measuring Machine (CMM) is a device used in Computer Aided Quality Control (CAQC) to measure the physical geometrical characteristics of an object. It is commonly used in manufacturing to ensure parts meet design specifications by measuring dimensions and tolerances. Step 2: Analyze the operation of a CMM.
A CMM typically consists of a probe that interacts with the surface of the workpiece to collect data points in a 3D coordinate system (X, Y, Z).
Contact CMMs: The most common type, where the probe physically touches the workpiece to measure points. The probe can be a mechanical tip that triggers upon contact, recording the position.
Noncontact CMMs: Use technologies like laser scanning or optical imaging to measure without touching the workpiece. These are less common in traditional CMM setups but are used for delicate or complex surfaces.
In CAQC, CMMs are often integrated with computer systems to automate measurement, compare results to CAD models, and generate inspection reports. Step 3: Determine the inspection method of a typical CMM.
Traditional CMMs, especially those widely used in CAQC, are contact inspection methods. The probe physically touches the workpiece to measure points, making it a contact method.
Noncontact methods (e.g., laser scanning, vision systems) exist, but they are not the standard for most CMMs in CAQC, especially in older or conventional setups.
Radiation techniques are not typically associated with CMMs (they are more relevant in processes like X-ray inspection).
A CMM is not specifically a scanning laser beam device, though some modern CMMs may incorporate laser scanning as an option. Step 4: Evaluate the options.
(1) Uses radiation techniques: Incorrect, as CMMs typically do not use radiation for measurement (radiation is used in methods like X-ray tomography). Incorrect.
(2) Is a scanning laser beam device: Incorrect, as a traditional CMM uses a contact probe, not a laser beam. Some modern CMMs may use laser scanning, but this is not the standard definition. Incorrect.
(3) Is a noncontact inspection method: Incorrect, as traditional CMMs in CAQC use contact probes to measure the workpiece. Incorrect.
(4) Is a contact inspection method: Correct, as the standard CMM in CAQC uses a probe that physically contacts the workpiece to measure coordinates. Correct.
Step 5: Select the correct answer.
In Computer Aided Quality Control (CAQC), the coordinate measuring machine is a contact inspection method, matching option (4).