Before we start milling away our stock we first need to get down to the required depth.

This is not a problem with external features when we can plunge outside.

When machining closed pockets, however, we need to find a way to get down to the machining depth first.

As usual there are several ways to get the job done. The plunging methods listed here are not ordered by their preference.

For various machining operations on different materials some may be more preferable than others.

Straight Plunging into a larger Pre-Drilled hole

This is one the best ones in my opinion.
Very few machining modes can compete in effectiveness with drilling and this method will get you the best combined tool life on most materials and (in case of many deep pockets) the least machining time, even when tool change time is factored in.

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Canned cycles are used every time we need to drill, ream or tap holes on our CNC machine

Standard Fanuc G-Code language supports more than a dozen canned cycles.

The most common cycles that will cover 99.9% of your g-Code CNC programming work are:

Subsequent holes

You can drill additional holes After your canned cycle has been initiated.
Any line with X Y position will be treated as another hole position.

Each position can have its own Retract value, feed rate and retract height modifier.

G80 - Canned Cycle Cancel Code

After all the holes of the canned cycle have been drilled, it is required to call G80 code in order to cancel the current cycle.

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Optimizing Peck Drilling for Deep Holes

Peck drilling is often necessary when machining deep holes. However, with the correct feed and speed settings, pecking is unnecessary for depths up to:

• 3× diameter for standard drills
• 5× diameter for high-performance parabolic drills

For deeper holes:

• Up to 10× diameter → Up to 5 pecks for regular drills, and up to 3 pecks for parabolic drills
• Beyond 10× diameter → Constant pecking is required:
  • 0.5–1× diameter per peck for regular drills
  • 1.5–2× diameter per peck for parabolic drills

Since programming requires specifying a peck amount, here are the recommended values:

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