Acu-Rite CNC 3500i user manual 171

Continued:

Field	Code	Description
Max XY	V	Maximum XY tool stepover. Used if angle is
Step		so great that the amount of XY step per Z
		step exceeds 70 % of the tool diameter.
Z Step	Q	Z-axis finishing step-down.
Finish
Finish STK	S	XY finish stock amount, sides only.
XY
Finish	K	Finish-pass feedrate.
Feed
Rough	J	Roughing feedrate.
Feed
Tool Type	W	Flat or Ball end mill.

G-code format: G73

Draft Angle Pocket Example:

This program cuts the draft angle pocket shown in the figure. The drawing does not show the finish pass. Assume an existing rectangular pocket (4 in. long x 2 in. wide x 1 in. deep) with a theoretical sharp lower-left corner at X2 Y2. The following program machines a draft angle onto the existing pocket.

The tool performs the following operations:

Position the tool above the center of the lower-left corner radius. The tool path starts and ends at the center of the lower-left corner radius (after each perimeter pass) for all roughing passes. During finish passes, the tool steps down the draft angle and makes passes around the perimeter.

If a ball-end mill is programmed (W), the following points must be considered: the length (X) and width (Y) at the bottom of the pocket is measured at the tangency point of the ball radius, and the draft angle. The start height (H) must be set to (0.1 + ball radius) above surface to be cut. Set the tool-length offset so that the ball is buried up to its centerline when at the part surface (touch off the tip and add the ball radius, or touch off tip and use a negative length wear equal to the ball radius).

7.2 Canned Cycles

ACU-RITE 3500i 171