Acu-Rite CNC 3500i user manual Using the Feeds & Speeds Table

4.1 Tool Table

Using the Feeds & Speeds Table

The 3500i can calculate spindle speed, rough feed and finish feed for each tool.

To calculate the spindle speed enter the tool's diameter and the desired surface speed. The initial diameter shown is from the tool table. Changing the diameter in the Feeds & Speeds table also changes it in the Tool.

The surface speed is in feet/min in inch mode or meters/min in metric mode.

The calculated spindle speed is shown for the entered surface speed.

The spindle speed in inch mode is calculated using: rpm=surfaceSpeed*12÷(*toolDiameter). For example, with a tool diameter of 0.5" and surface speed of 250 ft/min the resulting spindle speed is 1910 (RPM).

The spindle speed in metric mode is calculated using: rpm=surfaceSpeed*1000÷(*toolDiameter)

Feedrates can be calculated once the Spindle Speed is known.

Enter the number of teeth for the tool and a desired chip load for roughing and finishing.

The corresponding feedrate is calculated for each chip-load.

The feedrate is calculated using:

feedrate = spindleSpeed * numberOfTeeth * chipLoad. For example, with the previously calculated spindle speed, a 4 tooth tool and chipload of 0.007 the resulting feedrate is 53.4 (in/min).

The calculated spindle speed can be overridden. In this case the feedrate calculations use the new value. The calculated feedrates can also be overwritten.

After doing all the needed feeds and speeds calculation, touch the USE button to save changes, or CANCEL to exit without saving. In both cases the Feeds and Speeds table closes.

70 4 Tool Management