CNC Machines
Turning Cycles
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CANNED (FIXED) CYCLES
 Canned cycles, usually, contains a mix of the following:
-Standard canned cycles that appear on almost every CNC
control.
-Special canned cycles that the CNC control manufacturer
offers with the machine control.
 Canned cycle can be grouped as follows: - Hole making cycles
 - Milling making cycles
 - Turning cycles
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CNC Turning Cycles
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Hole Making Cycles
 Drilling cycle
 Drilling with dwell
 Peck drilling cycle
 Right hand tapping cycle
 Left hand tapping cycle
 Boring / Reaming cycle
 Boring with rapid retract cycle
As canned cycles are designed by the CNC manufacturers, they differ
from a machine to another. They, also, may have different G’s code
number
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Drilling cycle
 Hole Operations
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 Most hole canned cycles work with the same fashion
- It moves fast in X and Y axes to the location of the center
line of the hole
- It moves fast in Z axis to the approach plane (rapid plane).
This level “R” is predetermined by the programmer as a safe
distance from the part surface that permits rapid tool travel
without hitting the surface.
- It moves with the feed rate in Z axis to make the hole up to
the depth
- It retracts back in a fast motion in Z axis to the rapid plane
or to the initial plane
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 The Format of the drilling cycle varies from machine to
another. Some manufacturer retracts the tool after drilling to
the approach plane. Some others retract the tool to the initial
plane and, some requests to program the depth “Z” as
absolute i.e. from the initial plane, and others request to
program as incremental i.e. from the approach plane.
Thus the idea is to follow exactly the Format as stated
by the Machine tool manufacturer
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Rough and finish Profile turning cycles
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End
Thank You and Good Luck
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