Acu-Rite CNC 3500i User Manual

4 Tool Management

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.