Acu-Rite CNC 3500i user manual T1 * Special THD-TOOLS3500

11.5 Four Axis Programming

Example 3: Mill

Mount a fourth axis as described above. Mount a part 4” in diameter and 8” long on the face of the rotary table. Support the part on the X+ end by a live center. The part has a 0.25”, 45° chamfer on one end. Shortest Distance is set to on. This prevents the need to unwind the U-axis, saving operation time.

Table 15-3 shows a thread-milling example. Assume that a 4-8 UN 2A thread must be milled from the right end, 6” long. The tool is tapered to conform to the thread. Set X0 at the right end, Y0 at the cylinder's center line, U0 at a pre-milled keyway on the cylinder. Measure the tool offset from the top of the part (with Y axis at 0).

The X start position is one pitch (0.125 in.) to the right of X0, so that the tool enters the work smoothly.

*4-AX-THD

*SET Shortest Distance TO "on" G90 G70 G0 M5

G28 Z0

G53 O1

G0 X0 Y0 U0

T1 * SPECIAL THD-TOOLS3500

S3500

M3

G0 X.125 Y0 U0

Z.1

G1 Z-.075 F20

*SET Shortest Distance TO "on"

*THIS IS TO PREVENT THE NEED TO UNWIND U

*U AXIS MOVE IS

*(360 X 8 PITCH X 6" LONG)

*+ 360 FOR 1 TURN X.125 LEAD-IN

*U MOVE WILL BE 17,640.00 DEGREES

*OR 49 TURNS

G91 G1 X-6.125 U((360*8*6)+360)

G90 G0 M5

G28 Z0

X0 Y0 U0

M2

434 11 G-Code Edit, Help, & Advanced Features