Acu-Rite CNC 3500i User Manual

7 Programming: Canned Cycles, sub-programs

When you activate a drilling cycle, it executes after each programmed 
position, until you cancel it. 

The following reminders are for drill cycles:



F feedrate is optional. If it is not given, the current feedrate is used.



All start heights (R) and finish heights (P) as well as Z dimensions are 
absolute dimensions.



For all peck drill cycles, R (start height) must be 0.1" (or 2 mm) above 
the work surface.



Tapping uses S word for Spindle Yes/No. Your machine must be 
equipped with spindle M-functions.



Z-axis depth can be changed by placing a new Z depth on the same 
line as the X- and/or Y-axis location of the hole you want the new 
depth applied. A Z address on a line of its own causes the control to 
drill the new depth at the current location.

Modal cycles remain active until canceled. Use Drilloff (G80) to cancel 
drill, tap, and bore canned cycles.



Basic drilling cycle is generally used for center drilling or hole drilling 
that does not require a pecking motion. It feeds from the start height 
(R) to the specified hole depth (Z) at a given feedrate (F), then rapids 
to the return height (P).



G-code format: G81

The P entry (return height) is optional, and you do not need 
to provide it. If you do not specify P, the CNC sets it to R.  
If P is provided, it must be greater than R, or an alarm is 
given.

ZDepth

Z

Absolute hole depth. (Required)

StartHgt

R

Initial Z start point, in rapid. (Required)

ReturnHgt

P

Z return point after hole depth, in rapid.

Feed

F

Feedrate