Compatible Systems MicroRouter 900i Manual de usuario descargar pdf (Pagina 79)

Section 10 - Appendix - 79Microrouter CNC Machine User's Manual

10: Understanding Offsets

Where should I position the workpiece datum on my billet?

This depends on the position of the part datum set in your CNC

program. The part datum is the zero reference, or starting point,

used when plotting all the co-ordinates that describe the shape of

your design.

The part datum could have been set by the programmer, when

manually writing the CNC program from a traditional engineering

drawing, or automatically set by a CAD/CAM software package.

For example, if you used the CAD/CAM software package, Denford

MillCAM Designer, your design would have been drawn within a

fixed area, representing the size of the billet you intend to use. The

software would then have generated the CNC program,

automatically setting the front, left upper corner of this imaginary

billet as the part datum. In this case, you would need to position the

workpiece datum in the front, left upper corner of the real billet on

the machine table.

What happens if I don’t use any offsets with my CNC file?

If no offset is programmed, the machine controlling software will use

the machine datum as the starting point (zero reference) for any co-

ordinate movements it receives. Since it is unlikely that the position

of the machine datum is the place where you want any machining to

begin, your CNC machine will attempt to manufacture your design in

the wrong place in its working area. Offsets are very important

because without them, the CNC machine will not know where to

begin cutting on your billet. Offsets must always be configured

before manufacturing the part.

Are standard offset files supplied?

No, you must set your own. We DO NOT supply any standard offset

files with your CNC machine controlling software. However, once

you have configured and saved your offset files, the same files may

be used over and over again, so long as the following holds true:

• The same cutting tools are used.

• The next billet to be machined is the same size as the last billet

used.

• The next billet to be machined is placed in the working area in

exactly the same position as the last billet used.

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Compatible Systems MicroRouter 900i Manual de usuario Pagina 79