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78 - Appendix - Section 10 Microrouter CNC Machine User's Manual

10: Understanding Offsets

What are offsets?

Offsets are a collection of numerical values used to describe the

location of the workpiece datum. The moveable workpiece datum

defines the zero point on our workpiece (the material we want to

machine). This is the starting point for any cutting co-ordinates

supplied by the machine controller.

Two types of offset file are used, in combination, to describe this

location:

i) The workpiece offset file - This file allows global offset values to

be set for the X, Y and Z axes. In other words, every tool profile

will use the workpiece offset values.

ii) The tool length offset files - Every tool has its own individual tool

length offset file, containing a single Z offset value. They are

used to compensate for the differences in length between tools.

How is a workpiece datum calculated?

The X position of the workpiece datum is defined by the X value

entered into the workpiece offset file.

The Y position of the workpiece datum is defined by the Y value

entered into the workpiece offset file.

The Z position of the workpiece datum is defined by the combination

of the Z value entered into the workpiece offset file and the value

entered into the tool length offset file belonging to the tool profile

currently in use.

How is the workpiece datum used?

The software uses the workpiece datum as the starting point (zero

reference) for any co-ordinate movements it receives. These co-

ordinate movements are read from our loaded CNC file. In other

words, the position of the workpiece datum will determine the place

on the CNC machine where our part is manufactured.

What actually happens when I program my workpiece datum

position?

Configuring the workpiece datum position shifts, or offsets, the entire

three dimensional co-ordinate grid system used by the CNC

machine. The workpiece datum will now be read by the CNC

machine as its zero position, rather than the machine datum. The

machine datum is a fixed point, defined when you first switch on and

home the CNC machine.

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Compatible Systems MicroRouter 900i Manual de usuario Pagina 78