Looking for a CNC machine? Things to consider

May 26, 2014 8:45 am

Selecting the right CNC machine for an application is an important task to perform before making an investment. This article summarises the key parameters one must consider before purchasing a CNC equipment
 With a large variety of CNC (computer numerically controlled) machines available in the market today, loaded with advanced features and multitasking capabilities; it is really a critical task to select the right machine. The machine should have the ability to boost productivity and profitability, and hence one must look beyond just comparing the technical specifications and initial cost. 
According to Vikas Taneja, Vice President (Marketing), Jyoti CNC Automation Ltd., “Future plans have to be kept in mind while making the selection as the machine should not only fulfil current requirement but also should be capable of handling future challenges.” Mr Taneja underlines following considerations which would help in making the wise selection:
Define need:  The machine type and work envelop are defined based on the operations to be performed on components to be machined.  Multitasking / 5-axis machines can also be considered if the component geometry and relative accuracies demand complete machining in a single set-up.
Machine structure: Cast iron is considered to be the most vibration damping material for machine tool casting.  Machine base should be heavily ribbed, thus increasing the rigidity and strength for better performance and reliability. Advanced machine features like servo motor turret, torque motor driven rotary tables, LM guideways, efficient chip management, etc. greatly compliment productivity, hence require important consideration.
Accuracies: CNC machines are equipped with high-resolution rotary encoders for position feedback, and the option of precision glass scales can be opted for achieving better geometrical accuracies on the component.
Spindle: Spindle power and torque, spindle taper, high-speed electro-spindles, selection largely depends on application, component material and cutting tools used. High speed machining (HSM) is the buzzword today, and helps in high material removal and better surface finish using high cutting parameters.

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