Overview Of:
CNC & Machine Controls

The CNC (computer numerical control) system of a machine tool includes the control unit itself, as well as less visible parts of the motion-control system such as the servomotors, drives and axis positioning devices. These components are part of any CNC machine tool, but they might be bought separately and retrofitted later on older machines that are upgraded or refurbished.

Also part of the control system are sensors that may allow the control to make certain real-time decisions during unattended or lightly attended machining processes. These can include probes for measuring the position of the part or machined features, as well as monitoring systems for detecting the presence of the tool or the force that is being exerted in the cut.

Zone: CNC & Machine Controls

Move The Program Instead Of The Part

This part has taken eight setups A complex five-axis part with hard-to-reach datums is machined in two setups instead of eight, thanks to a process that rewrites the tool paths to match the part's position.

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Accuracy Gain From Linear Encoders

open loop machining If the position of a machine tool’s axis is measured using a rotary encoder, then potentially the ballscrew is being asked to perform two contradictory functions. The ballscrew both drives the axis into position and indicates that position—because the ballscrew lies in between the encoder and the moving element of the machine. Control technology supplier Heidenhain calls this “semiclosed-loop” operation.

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Most Recent Content in this Zone:

Automating Machine Monitoring And Data Collection
10/13/2009 Modern Machine Shop: This automated machine data collection software automatically collects a wealth of information specific to machining processes and presents it in an intuitive format so users can quickly analyze the data and implement changes.
Probing for Part Inspection and Crash Avoidance
10/1/2009 Modern Machine Shop: A reader uses “Ask an Expert” to explore various potential uses of the machining center’s probe.
Machine Control Aimed At Job Shops And Beyond
9/23/2009 Modern Machine Shop: The Sinumerik 828D control is said to bring to the "job shop machine tool" a range of features and functionality typically reserved for high-end machine tools.
Upgrading Rotary Transfer Machines on the Shop Floor
9/18/2009 Production Machining: Smart manufacturers are using slower production demand to upgrade efficiency of their rotary transfer machines. This story looks at a Cleveland area integrator that can do the job in weeks and without removing machines from the shop.
How to Improve Machining Center Accuracy
8/26/2009 Modern Machine Shop: Accuracy is not just inherent to the machine—it also depends on how the machine is used. Try these techniques to let a new or existing CNC machining center achieve its potential precision.