PARAMETRIC BOLT CIRCLE HEX POCKET, THROUGH-BORE & CHAMFER CYCLE

Complete Multi-Feature Milling From One Reusable Parametric CNC Cycle

Machining repeated hex pockets around a bolt circle normally requires separate hole milling, pocket clearing, profiling, chamfering and repeated positioning for every feature.

The Parametric Bolt Circle Hex Pocket, Through-Bore & Chamfer Cycle combines the complete operation into one reusable parametric milling cycle.

Enter the required bolt-circle diameter, number of positions, hex size, bore diameter, machining depths, cutter size and feed settings — the cycle automatically controls the complete machining sequence.

Helical mill the bore. Machine the hex pocket. Chamfer the hex. Index around the bolt circle.

Define the job. Run the cycle. Reuse it.

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⚙️ CYCLE CAPABILITIES

✅ 3-axis X/Y/Z CNC milling

✅ Parametric bolt-circle / PCD machining

✅ Automatic multi-position indexing

✅ Parametric number of HEX pockets

✅ Editable PCD / BHC diameter

✅ Editable bolt-circle start angle

✅ Editable bolt-circle center X/Y position

✅ Parametric HEX across-flats size

✅ Parametric HEX pocket depth

✅ Parametric through-bore diameter

✅ Independent through-bore depth

✅ Helical bore milling

✅ Adjustable bore depth per revolution

✅ Same cutter used for complete machining sequence

✅ Automatic HEX pocket clearing

✅ Multiple depth passes

✅ Finished HEX wall profile

✅ Same-tool HEX chamfer machining

✅ 45° stepped chamfer generation

✅ Adjustable chamfer width

✅ Adjustable chamfer depth

✅ Adjustable chamfer step

✅ Automatic cutter-radius calculations

✅ Automatic HEX geometry calculations

✅ Automatic bolt-circle rotation

✅ Reusable for different PCD sizes and quantities

✅ Simple operator-editable parameters

✅ Multi-controller versions included

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🔩 COMPLETE MULTI-FEATURE MACHINING STRATEGY

The cycle combines several machining operations into one automated sequence.

At every programmed bolt-circle position, the cycle automatically performs:

✅ Helical through-bore milling

✅ HEX pocket machining

✅ Internal pocket clearing

✅ Finished HEX wall profiling

✅ Same-tool 45° HEX chamfer machining

✅ Safe retract

✅ Automatic indexing to the next bolt-circle position

The entire operation is then repeated automatically until all programmed positions are complete.

Instead of programming every hole, pocket and chamfer individually, the complete machining strategy remains stored inside the cycle.

You define the feature dimensions — the macro controls the machining process.

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🌀 HELICAL THROUGH-BORE MILLING

The first operation at each bolt-circle position is the parametric circular bore.

The bore diameter and final depth are independently controlled from the HEX pocket dimensions.

This allows the bore to continue deeper than the HEX pocket and can be used for through-hole machining applications.

Editable settings include:

✅ Bore diameter

✅ Bore depth

✅ Cutter diameter

✅ Helical radius

✅ Depth per revolution

✅ Helical cutting feed

The tool enters the material using a controlled helical milling movement instead of a direct plunge.

The bore is automatically positioned at every bolt-circle location before the HEX machining operation begins.

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⬡ PARAMETRIC HEX POCKET MILLING

After the bore is completed, the same cutter machines the HEX pocket.

The cycle automatically calculates the HEX geometry from the programmed across-flats dimension and cutter diameter.

The HEX pocket is machined using:

✅ Multiple Z depth passes

✅ Controlled internal clearing

✅ Calculated HEX boundaries

✅ Automatic cutter-center geometry

✅ Finished six-sided profile

The HEX pocket depth is completely independent from the through-bore depth.

For example:

Bore depth = 20 mm

HEX pocket depth = 8 mm

The bore can therefore continue through the component while the HEX pocket remains at the required controlled depth.

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🔻 SAME-TOOL 45° HEX CHAMFER

After the HEX pocket is completed, the same cutter automatically machines the chamfer.

No separate chamfer tool is required.

The cycle creates the angled HEX surface using repeated six-sided profile passes.

Each pass progressively changes the XY size and Z position to generate the programmed chamfer.

Editable settings include:

✅ Chamfer width

✅ Chamfer depth

✅ Chamfer step

✅ Chamfer feed

The complete HEX profile becomes progressively larger toward the top surface, producing the required 45° chamfer geometry.

One cutter can therefore complete:

Bore → HEX pocket → HEX finish → Chamfer

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🔄 AUTOMATIC BOLT-CIRCLE INDEXING

The complete machining operation is automatically repeated around the programmed bolt circle.

Enter:

✅ PCD / BHC diameter

✅ Number of positions

✅ Start angle

✅ Bolt-circle center X

✅ Bolt-circle center Y

The cycle automatically calculates the angular spacing:

360° ÷ Number of Features

The complete bore, HEX pocket and chamfer sequence is then rotated to every position around the bolt circle.

For example:

6 positions = 60° spacing

8 positions = 45° spacing

12 positions = 30° spacing

There is no need to manually calculate every feature coordinate.

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🚀 FANUC PARAMETRIC CUSTOM CYCLE

The Fanuc package includes the complete parametric BHC machining version.

The machining strategy uses reusable macro logic to automatically control:

✅ Bolt-circle indexing

✅ Helical bore generation

✅ Depth progression

✅ HEX clearing

✅ HEX profile generation

✅ Chamfer step progression

✅ Rotation to each machining position

The complete machining sequence remains stored inside one reusable cycle.

Change the required feature dimensions without rebuilding the complete CNC program.

One reusable macro for multiple PCDs, HEX sizes, bore sizes and machining depths.

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🌐 MULTI-CONTROLLER PACKAGE

The complete package includes versions developed for multiple CNC control families.

✅ FANUC

✅ SIEMENS

✅ HAAS

✅ MITSUBISHI

✅ MAZAK

✅ HEIDENHAIN

✅ OKUMA

✅ GSK

✅ FAGOR

Controller-specific variable formats and programming structures are supplied where required.

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📦 COMPLETE DOWNLOAD PACKAGE

Included:

✅ Parametric Bolt Circle HEX Pocket, Through-Bore & Chamfer Cycle

✅ Fanuc macro version

✅ Example machining program

✅ Editable parameter section

✅ Bolt-circle parameter explanation

✅ HEX geometry explanation

✅ Bore milling parameter explanation

✅ Chamfer parameter explanation

✅ Siemens version

✅ Haas version

✅ Mitsubishi version

✅ Mazak version

✅ Heidenhain version

✅ Okuma version

✅ GSK version

✅ Fagor version

✅ Controller-specific user guides

✅ Parameter explanations

✅ Setup information

✅ First-run and prove-out guidance

✅ Reusable production-ready cycle structure

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💡 WHY USE A PARAMETRIC MULTI-FEATURE CYCLE?

Different PCD? Change the bolt-circle diameter.

Need more HEX pockets? Change the quantity.

Different HEX size? Change the across-flats dimension.

Need a different through-hole? Change the bore diameter.

Different material thickness? Change the bore depth.

Different HEX depth? Change the pocket depth.

Larger or smaller chamfer? Change the chamfer settings.

Different cutter? Change the tool diameter.

The underlying machining strategy remains inside the cycle.

There is no need to manually rebuild the bore, HEX pocket, chamfer and bolt-circle positions every time the component changes.

Less repetitive programming. Fewer duplicated toolpaths. More reusable CNC automation.

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🏭 BUILT FOR REAL CNC PRODUCTION

The Parametric Bolt Circle HEX Pocket, Through-Bore & Chamfer Cycle is designed as a reusable machining tool rather than a one-job program.

Once configured for the machine, the same cycle can be reused across different components simply by changing the required parameters.

Ideal for:

✅ HEX socket features

✅ Bolt-circle HEX pockets

✅ Through-bore and counter-feature machining

✅ Fastener recesses

✅ Fixture plates

✅ Flanges

✅ Repetitive production components

✅ Parametric CNC programming

✅ Custom canned-cycle applications

✅ Multi-feature machining operations

✅ Production environments requiring reusable machining logic

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⚙️ ONE TOOL — MULTIPLE OPERATIONS

One of the main advantages of the cycle is the ability to complete several different machining operations using the same cutter.

The cycle can automatically perform:

1. Helical bore milling
2. HEX pocket roughing
3. HEX pocket finishing
4. 45° HEX chamfering
5. Bolt-circle indexing
6. This reduces unnecessary tool changes and keeps the complete machining strategy contained inside one automated cycle.
7. Load the cycle.
8. Set the parameters.
9. Run the operation.
10. Reuse it for the next component.
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🛒 AVAILABLE AS A STANDALONE CYCLE OR INSIDE CNC AUTOMATION PRO

Purchase the Parametric Bolt Circle HEX Pocket, Through-Bore & Chamfer Cycle as a standalone downloadable package, or access it through CNC Automation Pro together with hundreds of custom canned cycles, CNC macros, programming modules, software and CNC training resources.

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PARAMETRIC BOLT CIRCLE HEX POCKET, THROUGH-BORE & CHAMFER CYCLE

Bore the hole. Machine the HEX. Chamfer the profile. Index the bolt circle.

MacroMill CNC

www.macromillcnc.com