Acu-Rite CNC 3500i Benutzerhandbuch

2 Machining Fundamentals

A production drawing identifies a certain form element of the work 
piece, usually a corner, as the absolute zero datum. When setting the 
datum, you first align the work piece along the machine axes, and then 
move the tool in each axis to a defined position relative to the work 
piece. Set the display of the CNC either to zero or to a known position 
value for each position. This establishes the reference system for the 
work piece, which will be used for the CNC display and your part 
program.

If the production drawing is not dimensioned for that particular CNC, 
set the datum at a position or corner on the work piece which is 
suitable for deducing the dimensions of the remaining work piece 
positions.

The fastest, easiest and most accurate way of setting the datum is by 
using a 3-D touch probe from HEIDENHAIN Corp. Refer to chapter "7.3 
Probing Cycles on page 197”.

Example 1: Offset

See "Fixture Offset (Work Coordinate System Select):" on page 136 for 
more information on using the Offset cycle. Use the Offset command 
to apply a Fixture Offset of the absolute zero datum to the corner of 
WorkPiece #1.

Format: Offset Fixture #1 X10  Y10

Offset Fixture #1

Machining positions are now referenced from the lower left corner of 
WorkPiece #1.

Use the Offset command to apply a Fixture Offset of the absolute 
zero datum to the corner of WorkPiece #2.

Format: Offset Fixture #2 X60  Y10

Offset Fixture #2

Machining positions are now referenced from the lower left corner of 
WorkPiece #2.