Canned Cycle Turning Programming | G71 | Example IV | Jignesh Shah

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Canned Cycles in G-Code

The last aspect of G-code to touch on is canned cycles. These are similar to methods or functions in computer programming. They allow you to perform a complicated action in only a few lines of code without having to type out all of the details.

Take, for example, the canned cycle below. Here we are telling the CNC tool to create a hole with a peck drill in only two lines of code on the left. This same action takes over 20 lines of regular G-code.

 

Some common drill cycles includes:

G81 – Simple Drill Cycle

This cycle will make a hole by plunging to a specific Z-axis coordinate and then retracting. Programming this cycle requires a depth, feed rate, XY coordinates, and plane to drill on.

 

G83 – Peck Drill

This cycle is used for quickly drilling deep holes. A tool will first drill a defined distance and then retract, which clears any material out of the hole and allows coolant to flush away chips. This cycle’s simplest implementation requires an initial height, feed plane, peck increment, and depth.

 

G98 – Return to Initial Rapid Height

This cycle will retract a tool to a clearance plane between holes, which helps to avoid clamps. Programming this cycle requires an initial height and feed plane to drill on.

 

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