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descriptions below) is determined by the setting of the retract_mode: either to

the original Z position (if that is above the R position and the retract_mode is

G98, OLD_Z), or otherwise to the R position. (See G98/G99 below)

10.1 Preliminary Motion

Preliminary motion may be confusing on first read. It should come clear as you

work through the examples in G80 and G81 below. Preliminary motion is a set

of motions that is common to all of the milling canned cycles. These motions

e computed at the time the canned cycle block is encountered by the inter-

preter. They move the tool into the proper location for the execution of the

canned cycle itself.

These motions will be different depending on whether the canned cycle is to be

executed using absolute distances or incremental distances. These motions will

also be affected by the initial position of the z axis when the canned cycle block

is encountered in a program.

If the current Z position is below the R position, the Z axis is traversed to the R

position. This happens only once, regardless of the value of L.

In addition, for each repeat as specified by L, one or two moves are made

before the rest of the cycle: 1. a straight traverse parallel to the XY-plane to the

giv

en XY-position 2. a straight traverse of the Z-axis only to the R position, if it

is not already at the R posi

tion.

10.2 G80

G80 turns of

f all motion. You should think of it as the off position on a rotary

switch where the other positions are the different possible motion modes. In

the EMC interpreter, G80 is one of the modal codes so any other code will

replace it. The result of the following lines of code is the same.

N1000 G90 G81 X1 Y1 Z1.5 R2.8 (absolute distance canned cycle)

N1001 G80 (turn of

f canned cy

cle motion)

N1002 G0 X0 Y0 Z0 (turn on rapid traverse and move to coordinate home)

produces the same final position and machine state as

N1000 G90 G81 X1 Y1 Z1.5 R2.8 (absolute distance canned cycle)

N1001 G0 X0 Y0 Z0 (turn on r

apid traverse and move to coordinate home)

The adv

antage of the first set is that, the G80 l

ine clearly turns of

f the G81

SmithyCNC Programmer’s Reference Manual: Mill Canned Cycles

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