IMPROVING CNC PART QUALITY INCLUDING ACCURACY OF CNC MACHINES

The quality of every component produced on a CNC machine is highly dependent on the machine’s performance. The accuracy of machined components would depend upon inherent accuracy of the machine tool as well as the machining system as whole including process, Tooling, Work holding and Programming. One of the major contribution for the machine tool’s repeatability and, as a consequence, the accuracy of the parts being produced is the thermal effects generated by internal heat sources or environmental changes. With the proper implementation of direct position measurement feedback systems, on linear and angular axes, most thermal errors in the position loop can be eliminated. Regular testing of the machines using Ball bar and Laser equipment will highlight the present condition of the CNC machines and suitable corrective actions can be followed thereafter. The correct process also plays a vital part in achieving the desired results.

FOCUS AREAS

• Improving CNC part quality :
• Turned components :- Roundness/cylindricity errors
• Dimensional variations
• Chatter & vibrations
• Prismatic components:- Positioning errors
• Roundness errors in boring
• Concentricity errors between bores
• Accuracy of CNC machined parts – Role of Machine tools and machining process

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