Section 8 Glossary

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Relative Coordinates - The XYZ position of the tool on the CNC machine relative to the point at which the Relative Coordinates were zeroed. The relative coordinate system is general purpose and may be used for anything you choose.

Resonant Speeds - Rotational speeds at which a stepper motor will vibrate excessively. Quite often, the motor will stall if run at these speeds. This is dependent on the size of the motor, the size of the load it is driving, and the power of the controller. Typically, increasing loads and reducing controller current will reduce resonance.

Screw Thread - The number of turns per inch of travel of the helical drive screw for each axis.

Serial Port - A communications port on both the PC and the Controller used to exchange commands and information.

Setup File - A file containing the CNC Setup Parameters for a machine tool. These files have a “.STP” extension by default.

Step Mode - The number of mini, or micro steps between each full motor step. The default step mode in LC is Quarter-Step, or four micro steps between each full motor step.

Stepper Motor - A motor that moves a precise amount when given an electrical pulse. Stepper motors typically have 200 full steps per revolution, or 1.8° per full step. Other popular stepper motors have 0.9° and 7.5° per step.

Text Boxes - Areas in which you type either a name or a value.

Tool Path - The path that a machine tool moves as a G-Code program is executed.

Tool Path View Port - The area of the main screen that graphically displays the tool path in real time.

Tool Position Box - The area of the main screen that shows the current coordinates of the tool on the machine tool. You can display any one or all of the four coordinate systems in this box.

Tool Positioning Resolution - The amount of machine tool movement on a given axis that corresponds to one step of the stepper motor. Note that one step is either one Full-Step, one Half-Stepor one Quarter-Stepdepending on the step mode of the Stepper Motor Driver. Tool Positioning Resolution (TPR) depends on 4 factors: Step Mode (SM), Gear Ratio (GR), Motor Resolution (MR), and Screw Thread (ST), where

TPR = 1 / (SM * GR * MR * ST)

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Anaheim DPJ72LC3, DPJ72LC2, DPJ72LC4 manual Glossary