High Precision in CNC Machining and the Factors Affecting It

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CNC machining is a crucial part of the manufacturing sector used to create metal and plastic parts, two of the most popular elements of every industry. These parts have specific dimensions, including shape, size, length, etc., which need to be precise and consistent throughout the manufacturing cycle. Even more so if the parts are used for industries like healthcare, electronics, defense, sports, etc.To maintain the high precision and consistency of parts, manufacturers and design engineers use CNC machining, that’s automated according to the specific dimensions. These machines help produce consistent parts in high volumes, which wouldn’t have been possible manually.

Factors Affecting High Precision in CNC Machining

CNC Machine’s Deviation

There can be three types of deviations in a CNC machine that affects its precision, such as spindle rotation deviation, drive chain deviation, and rail deviation. These deviations occur due to uneven wear, rotation, or assembly of the machine and directly affect its manufacturing accuracy.

Tool Geometric Deviation

Tools are prone to wear during the continuous cutting process, which can change the shape or size of the parts. The deviations vary according to the tool type. For example, a faulty fixed-size tool will affect high-precision machining, whereas general tools won’t.

Fixture and Jigs Deviation

Fixtures and jigs help manufacturing parts correspond to the accurate position of the machine; any deviation in their position or performance can cause machining errors.

Position Deviation of Manufacturing and Machining

Multiple geometric elements are selected as a positioning reference to cut tools according to their specified dimensions. When these elements (or positioning reference points) are inaccurate, they cause misalignment and positioning inaccuracy. As a result, you’ll get irregular-sized or shaped parts.

Measurement Deviation

CNC machines and manufacturers require accurate measurements during or after processing. Things like gauge accuracy, measurement methods, etc., can cause measurement deviation and show inconsistent results.

Other Factors

Besides machine deviation or misalignment, there are other factors that affect the high precision of CNC machining. These factors include materials used, machined objects, and vibration (because it can produce variation). While you can control many factors, some changes are inevitable, which affect accuracy and precision by a few microns. That’s why manufacturers define a certain level of acceptable tolerance.

Get High-Precision CNC Machined Parts from Connekt

Connekt LLC is an engineering design firm in Northern California, offering many solutions, including CNC machined parts. All our parts adhere to precision and accuracy requirements. Check out our portfolio here.

CNC machined parts at Connekt

We also offer other services such as rapid prototyping, FEA consulting, 3D printing, and electro-mechanical design services in Auburn, CA. Contact us to get started.

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