What are the types of CMM?
There are four main types of coordinate measuring machine (CMMs): bridge, cantilever, gantry and horizontal arm. The one you choose will be determined by what you wish to use it for. All CMMs have three orthogonal axes, X, Y and Z which operate in a 3D coordinate system.
Which of the following is the important feature of CMM?
Co-ordinate Measuring Machines are built rigidly and are very precise. Important features of the CMMs are : (i) To give maximum rigidity to machines without excessive weight, all the moving members, the bridge structure, Z-axis carriage, and Z-column are made of hollow box construction.
What are the 5 levels of CMM?
There are five levels of the CMM:
- Level 1 – Initial. Processes are usually ad hoc and the organization usually does not provide a stable environment.
- Level 2 – Repeatable. Software development successes are repeatable.
- Level 3 – Defined.
- Level 4 – Managed.
- Level 5 – Optimizing.
What is CMM and its levels?
The Software Engineering Institute (SEI) Capability Maturity Model (CMM) specifies an increasing series of levels of a software development organization. The higher the level, the better the software development process, hence reaching each level is an expensive and time-consuming process.
What is the difference between CMM and Umm?
1. What is the difference between CMM and UMM? Explanation: Co-ordinate measuring machine doesn’t inspect the geometric features of the part but universal measuring machine does it. Co-ordinate measuring machine is less accurate than a universal measuring machine.
Which of the following numerical controlled CMM is used?
In which of the following numerical controlled CMM used? Explanation: CMMs are designed originally for the measurement of high-precision on relatively few workpieces in the metrology labs but are now used both in the workshop and on the production floor.
What is the accuracy of present day Coordinate Measuring Machine?
10 microns
Why retooling is fast and less expensive in automatic inspection machines?
Explanation: Retooling is fast and not much expensive because no hardware changes are required and the software program is able to achieve these. Electronic gauging machines provide information that can be interfaced with computers or CRT or analysers.
Which of the following machine is used for rolling tests?
8. Which of the following machine is used for rolling tests? Explanation: Rolling test is generally performed on Parkson Gear Tester. This test reveals any errors in pitch, tooth form and concentricity of pitch line.
Which of the following is another name of Radius gauge?
Fillet gauges
Is used for measuring tooth thickness?
The chordal tooth thickness measurement method uses a tooth caliper that is referenced from the gear’s tip diameter. The thickness is measured at the reference circle as detailed in Figure 1.
What is the clearance of gear?
Clearance is the distance between the outside diameter of a gear and the root diameter of its mate. This margin compensates for the thermal expansion that occurs during operation, and prevents the top of a gear tooth from interfering with the root of its mating gear tooth.