BOLT HOLE CIRCLE THREAD MILLING CYCLE
PARAMETRIC BOLT HOLE CIRCLE THREAD MILLING CYCLE
Professional Parametric Thread Milling Across a Complete Bolt Hole Circle From Simple Editable Parameters
Turn repetitive bolt-hole-circle thread milling into a compact, reusable parametric CNC cycle.
The Parametric Bolt Hole Circle Thread Milling Cycle provides a flexible solution for machining multiple threaded holes automatically around a programmed PCD / BHC using calculated hole positions, helical thread milling and automatic indexing.
Define the PCD. Define the number of holes. Define the thread. Define the cutter. Define the pitch and depth. Run the cycle. Reuse it.
⚙️ CYCLE CAPABILITIES
✅ 3-axis CNC milling
✅ X / Y / Z-axis thread milling
✅ Parametric bolt hole circle thread milling
✅ Automatic PCD / BHC hole positioning
✅ Automatic equal hole spacing
✅ Adjustable bolt hole circle diameter
✅ Adjustable number of holes
✅ Adjustable start angle
✅ Adjustable thread major diameter
✅ Adjustable thread minor diameter
✅ Adjustable thread mill diameter
✅ Adjustable thread pitch
✅ Adjustable thread bottom Z
✅ Adjustable thread top Z
✅ Adjustable cutting feed
✅ Adjustable spindle speed
✅ Automatic X-axis hole-position calculation
✅ Automatic Y-axis hole-position calculation
✅ Automatic angular indexing
✅ Automatic cutter-center radius calculation
✅ Automatic radial machining progression
✅ Three automatically equalized thread-milling passes
✅ Smooth calculated helical lead-in
✅ Smooth calculated helical lead-out
✅ Continuous helical thread generation
✅ Automatic pitch-controlled Z progression
✅ Automatic complete thread-depth calculation
✅ Automatic hole-to-hole indexing
✅ Automatic complete BHC machining
✅ Automatic machining of every programmed hole
✅ Automatic thread-path scaling for different diameters
✅ Automatic adaptation for different cutter diameters
✅ Automatic adaptation for different PCD sizes
✅ Automatic adaptation for different hole quantities
✅ Automatic adaptation for different thread pitches
✅ Automatic adaptation for different thread depths
✅ Reduced repetitive CNC programming
✅ Reduced manual coordinate calculation
✅ Reduced CAM-generated program size
✅ Reusable across multiple thread sizes
✅ Reusable across different bolt patterns
✅ Reusable across different thread mills
✅ Suitable for flanges, plates, manifolds, covers, tooling plates and production components
✅ Compact reusable custom canned-cycle structure
✅ Controller-specific versions supplied
🚀 CUSTOM CANNED CYCLE
The complete bolt-hole-circle thread-milling operation is contained inside the reusable custom cycle.
The operator or programmer simply enters the required PCD, number of holes, thread dimensions, cutter diameter, pitch and Z machining values.
The cycle handles the complete thread-milling operation automatically.
No manually calculating every X/Y hole coordinate.
No manually programming each threaded hole.
No copying and editing the same helical thread path repeatedly.
No manually calculating cutter-center radii.
No manually indexing each position around the bolt circle.
No rebuilding the complete thread-milling program for every new PCD.
No rebuilding the program when the hole quantity changes.
No rebuilding the program when the thread size changes.
Change the required dimensions and reuse the same cycle for the next component.
🔄 PARAMETRIC BOLT HOLE CIRCLE STRATEGY
The cycle automatically calculates every threaded-hole location from the entered bolt hole circle diameter, number of holes and starting angle.
Each hole is positioned mathematically around the complete 360° bolt pattern.
The cycle moves to the first calculated hole position, performs the complete thread-milling operation, retracts and automatically indexes to the next hole.
This process continues until every threaded hole around the BHC is complete.
Different PCD? Enter the new diameter.
Different number of holes? Enter the new quantity.
Different starting position? Enter the new start angle.
The complete bolt-hole pattern automatically recalculates.
🌀 AUTOMATIC HELICAL THREAD MILLING
Each threaded hole is machined using synchronized circular X/Y interpolation with controlled Z-axis progression.
The programmed pitch determines the vertical movement of the helical path.
The cutter enters through the pre-machined hole, moves to the calculated thread-milling position and machines upward through the programmed thread depth.
The complete helical thread path is generated automatically from the entered thread data.
No manually programming repeated helical circles.
No manually calculating Z movement for every revolution.
No manually calculating every arc endpoint.
Define the thread. The cycle handles the helical motion.
🔵 SMOOTH HELICAL LEAD-IN AND LEAD-OUT
The cycle uses calculated lead-in and lead-out movements to provide smooth cutter engagement with the thread profile.
The tool transitions progressively from the hole-center area into the thread-milling path before beginning the main helical cut.
At the top of the thread, the cycle performs the calculated exit movement before returning safely toward the hole center.
Smooth engagement. Controlled helical cutting. Smooth exit.
This reduces sudden cutter engagement and avoids simply feeding directly into the finished thread wall.
📐 AUTOMATIC THREAD-PATH CALCULATION
The programmer does not need to manually calculate the cutter-center radius for each thread size.
The cycle automatically determines the required thread-milling path from the entered:
✅ Thread major diameter
✅ Thread minor diameter
✅ Thread mill diameter
✅ Required radial machining progression
The toolpath automatically scales when the thread size or cutter diameter changes.
Different major diameter? Enter the new value.
Different minor diameter? Enter the new value.
Different thread mill? Enter the new tool diameter.
The machining path automatically adapts.
↔️ AUTOMATIC RADIAL PASS CONTROL
The standard cycle generates three progressive thread-milling paths automatically.
The first path begins from the calculated inner cutter-center position.
The intermediate path is automatically equalized.
The final path reaches the calculated finished thread diameter.
No manually calculating individual radial passes.
No manually editing three separate helical programs.
The radial machining strategy automatically adjusts when the thread or cutter diameter changes.
🔢 AUTOMATIC BHC INDEXING
The cycle automatically calculates the angular spacing between every hole.
The complete 360° pattern is divided by the programmed number of holes.
Each new position is calculated automatically using the entered PCD and starting angle.
The programmer does not need to calculate:
✅ X coordinates
✅ Y coordinates
✅ Angular spacing
✅ Individual hole positions
✅ Repeated index movements
The complete pattern is generated automatically.
🎯 ADJUSTABLE START ANGLE
The complete bolt-hole-circle pattern can be rotated using a single start-angle value.
Start at 0°.
Start at 45°.
Start at 90°.
Or enter the required angular position.
The complete BHC pattern automatically rotates while maintaining equal spacing between every threaded hole.
⬆️ AUTOMATIC THREAD-DEPTH CONTROL
Define the thread bottom Z.
Define the thread top Z.
Define the pitch.
The cycle automatically generates the required helical progression between the programmed Z positions.
The cycle also checks the programmed depth against the thread pitch to help prevent incompatible thread-height settings.
No manually calculating the number of revolutions.
No manually programming each Z increment.
No rebuilding the thread path when the depth changes.
📦 COMPLETE DOWNLOAD PACKAGE
✅ Parametric Bolt Hole Circle Thread Milling Cycle
✅ Fanuc custom canned-cycle version
✅ Fanuc standalone macro version
✅ Siemens R-variable version
✅ Heidenhain Q-parameter version
✅ Okuma V / VC-variable version
✅ Fagor P-parameter version
✅ GSK version
✅ Haas version
✅ Mazak EIA / ISO version
✅ Mitsubishi version
✅ Controller-specific CNC programs
✅ Controller-specific parameter formats
✅ Fanuc calling example
✅ Standalone editable-variable program
✅ Parameter mapping guides
✅ Quick-reference information
✅ Installation guidance
✅ Machine setup information
✅ Work-zero setup guidance
✅ Tool setup information
✅ PCD setup guidance
✅ Thread setup information
✅ First-run and prove-out guidance
✅ Full controller-specific user guides
✅ Editable CNC programming files
🎛️ SIMPLE EDITABLE INPUTS
✅ PCD diameter
✅ Number of holes
✅ Start angle
✅ Thread major diameter
✅ Thread minor diameter
✅ Thread mill diameter
✅ Thread pitch
✅ Thread bottom Z
✅ Thread top Z
✅ Cutting feed
✅ Spindle speed
The cycle automatically calculates the remaining bolt-hole-circle positions, thread-milling geometry and machining sequence.
Different PCD? Enter the new diameter.
Different hole quantity? Enter the new number.
Different thread size? Enter the new major and minor diameters.
Different cutter? Enter the new cutter diameter.
Different pitch? Enter the new pitch.
Different thread depth? Enter the new Z values.
The complete BHC thread-milling strategy automatically adapts to the new job.
💡 WHY USE THIS CYCLE?
Bolt-hole-circle thread milling normally requires the same machining sequence to be programmed repeatedly at multiple X/Y positions.
Different PCD means different hole coordinates.
Different number of holes means different angular spacing.
Different start angle changes every position.
Different thread diameter changes the cutter path.
Different cutter diameter changes the machining radius.
Different pitch changes the complete helical movement.
Different thread depth changes the required number of revolutions.
The Parametric Bolt Hole Circle Thread Milling Cycle handles these calculations automatically.
No manually calculating every BHC coordinate.
No manually indexing every hole.
No copying the same thread program repeatedly.
No manually calculating cutter-center radii.
No manually programming every helical revolution.
No manually recalculating the thread path when the cutter changes.
No rebuilding long repetitive thread-milling programs.
Less repetitive programming. Faster setup. Consistent thread machining. Reusable CNC automation.
🏭 SUITABLE APPLICATIONS
✅ Flanges
✅ Circular plates
✅ Manifolds
✅ Valve bodies
✅ Covers
✅ Bearing housings
✅ Tooling plates
✅ Machine components
✅ Fixtures
✅ Production components
✅ Multi-hole threaded patterns
✅ Regular bolt-hole-circle thread patterns
🛒 AVAILABLE STANDALONE OR INSIDE CNC AUTOMATION PRO
Purchase the Parametric Bolt Hole Circle Thread Milling Cycle as a standalone downloadable module, or access it through CNC Automation Pro together with 100s of custom canned cycles, CNC macros, programming modules, software and training resources.
PARAMETRIC BOLT HOLE CIRCLE THREAD MILLING CYCLE
Define the PCD. Define the holes. Define the thread. Define the cutter. Run the cycle. Reuse it.
MacroMill CNC