PARAMETRIC RADIUS GROOVE & FILLET BLEND CYCLE

Complete Round-Bottom Groove Machining, Automatic Fillet Blending & Full-Retract Chip-Control From One Reusable CNC Cycle

Machining round-bottom grooves becomes considerably more complex when the finished profile requires a controlled main radius, smooth corner fillets, repeated groove positions and reliable chip control.

The Parametric Radius Groove & Fillet Blend Cycle combines the complete machining strategy into one reusable CNC lathe cycle.

Enter the required component diameter, groove depth, main groove radius, corner fillet radius, groove position and quantity — the cycle automatically controls the complete machining sequence.

Machine one groove or an entire repeated groove pattern from the same reusable cycle.

Rough the profile. Break the chips. Blend the corners. Finish the radius. Repeat automatically.

Define the job. Run the cycle. Reuse it.

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⚙️ CYCLE CAPABILITIES

✅ 2-axis X/Z CNC lathe machining

✅ Parametric round-bottom groove machining

✅ Single or multiple groove capability

✅ Editable stock outside diameter

✅ Editable groove root diameter

✅ Editable main groove radius

✅ Editable corner blend fillet radius

✅ Editable first groove center position

✅ Editable number of grooves

✅ Editable center-to-center groove spacing

✅ Automatic groove-position calculation

✅ Automatic repeated-groove progression

✅ Automatic main-radius geometry

✅ Automatic corner-fillet blending

✅ Smooth tangent transition from OD into groove

✅ Left and right blend geometry automatically controlled

✅ Full-retract chip-control peck machining

✅ Complete tool withdrawal after every roughing peck

✅ Controlled return through previously machined material

✅ Progressive groove roughing

✅ Automatic roughing across the complete groove width

✅ Reduced final finishing load

✅ Automatic left-side profile finishing

✅ Automatic right-side profile finishing

✅ Outside-to-center finishing strategy

✅ Full retract between finishing sides

✅ Controlled round-bottom finishing

✅ Automatic progression to the next groove

✅ Independent roughing and finishing cutting conditions

✅ Reusable for different groove radii

✅ Reusable for different corner fillets

✅ Reusable for different groove depths

✅ Reusable for different groove quantities

✅ Reusable for different groove spacing

✅ Designed for repetitive CNC production

✅ Multi-controller packages available

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🔵 COMPLETE RADIUS-GROOVE MACHINING STRATEGY

The cycle automatically controls the complete machining sequence for each programmed groove.

Every groove is produced using a stored machining strategy combining progressive roughing, full-retract chip control, calculated radius geometry, blended corner finishing and automatic repositioning.

For every groove the cycle performs:

✅ Safe outside positioning

✅ Progressive profile roughing

✅ Full-retract chip-control pecking

✅ Automatic roughing across the groove width

✅ Complete chip-clearance retracts

✅ Controlled return for the next cut

✅ Left corner-blend finishing

✅ Main radius finishing to center

✅ Full retract

✅ Right corner-blend finishing

✅ Main radius finishing to center

✅ Full clearance before repositioning

✅ Automatic movement to the next groove

The complete sequence is repeated automatically until the programmed groove quantity has been completed.

No need to manually program every plunge, arc, blend and groove position individually.

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🔨 FULL-RETRACT CHIP-CONTROL MACHINING

Round-bottom grooves can create difficult chip conditions because the cutting tool progressively becomes surrounded by material as the groove deepens.

Continuous cutting can increase:

✅ Chip packing

✅ Heat concentration

✅ Tool loading

✅ Coolant restriction

✅ Insert stress

✅ Risk of chips becoming trapped inside the groove

The cycle uses a controlled full-retract peck machining strategy.

After each roughing cut, the tool completely withdraws outside the component before returning for the next cutting movement.

This provides:

✅ Improved chip evacuation

✅ Better coolant access

✅ Reduced chip packing

✅ Improved cutting-zone clearance

✅ Controlled deeper grooving

✅ More manageable chip formation

✅ Reduced continuous tool engagement

✅ Reliable repetitive roughing

Chip-control behavior remains built directly into the machining strategy.

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🔄 CONTROLLED RE-ENTRY

After every full retract, the tool returns through the previously cleared machining area before beginning the next cutting movement.

The strategy becomes:

Cut → Fully retract → Clear chips → Return through cleared area → Cut deeper → Fully retract

This allows the tool to clear the component completely while still returning efficiently for the next peck.

The material-removal movement remains controlled rather than rapidly entering uncut stock.

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📐 PARAMETRIC MAIN RADIUS GEOMETRY

The primary groove profile is controlled by the required finished groove radius.

Change the main groove radius and the cycle automatically recalculates the profile required to produce the new geometry.

The same reusable cycle can therefore be adapted to different:

✅ Round-bottom groove sizes

✅ Groove depths

✅ Component diameters

✅ Groove locations

✅ Production components

No need to manually recreate the circular groove profile every time the radius changes.

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✨ AUTOMATIC CORNER FILLET BLENDING

The groove does not terminate against the outside diameter with a sharp intersection.

Both upper corners of the round-bottom groove include controlled fillet blends.

The finished profile transitions smoothly:

OD → Corner fillet → Main groove radius

The same blended transition is automatically produced on both sides of the groove.

This provides:

✅ Smooth profile transitions

✅ Controlled corner geometry

✅ Adjustable blend radius

✅ Reduced sharp-profile transitions

✅ Professional finished groove geometry

✅ Automatic left and right blending

The operator defines the required fillet size and the cycle adapts the finished profile automatically.

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🔗 TANGENT PROFILE TRANSITIONS

One of the key features of the cycle is the controlled transition between the outside diameter, corner fillet and main groove radius.

Rather than treating each radius as an unrelated feature, the machining strategy produces a continuous blended profile.

This creates a smooth progression through:

Outside diameter

→

Corner blend

→

Main radius

→

Groove center

The same geometry is mirrored on the opposite side.

This allows the complete round-bottom groove to be produced as one continuous finished profile.

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🔵 ROUND-BOTTOM GROOVE MACHINING

The cycle is designed specifically for curved groove profiles rather than conventional square-bottom grooving.

The finished groove can include:

✅ Controlled groove depth

✅ Main concave radius

✅ Left corner fillet

✅ Right corner fillet

✅ Smooth OD transitions

✅ Controlled groove center

✅ Symmetrical finished profile

The resulting geometry is suitable for components requiring smooth radiused grooves rather than sharp-bottom or straight-wall groove forms.

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🔨 PROGRESSIVE PROFILE ROUGHING

The final curved profile is not left for one large finishing cut.

Before finishing, the cycle progressively removes material across the groove.

The roughing strategy follows the required groove shape while leaving a controlled amount of material for the final profile.

This helps reduce:

✅ Heavy final cuts

✅ Sudden tool loading

✅ Excessive finishing engagement

✅ Heat generation

✅ Finishing-pass stress

✅ Unnecessary insert loading

The final radius and blend finishing passes therefore remove only the controlled remaining material.

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✨ OUTSIDE-TO-CENTER FINISHING

The final profile is machined from each side independently.

The first side is finished:

Outside diameter → Corner blend → Main radius → Groove center

The tool then completely retracts.

The opposite side is finished:

Outside diameter → Corner blend → Main radius → Groove center

The tool then retracts completely again.

This finishing strategy avoids forcing the tool continuously through the entire groove from one outside edge to the other.

Each side is independently controlled and finishes toward the groove center.

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↔️ SINGLE OR MULTIPLE GROOVE MACHINING

The same cycle can machine one groove or automatically produce multiple identical grooves.

The operator defines:

✅ First groove position

✅ Number of grooves

✅ Groove center spacing

Need one groove?

Set the quantity to 1.

Need three grooves?

Set the quantity to 3.

Need five grooves?

Set the quantity to 5.

The complete roughing, chip-control, blending and finishing sequence is automatically repeated for every programmed groove.

One cycle handles both single components and repeated groove patterns.

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🔄 AUTOMATIC GROOVE POSITIONING

When multiple grooves are required, there is no need to manually calculate every Z-axis position.

Define the first groove center and the required center-to-center spacing.

The cycle automatically positions every additional groove.

This makes the same cycle reusable for:

✅ Single grooves

✅ Double grooves

✅ Triple grooves

✅ Multiple repeated grooves

✅ Equal-spacing groove patterns

✅ Custom production components

Different groove spacing?

Change the job setting.

The complete groove pattern automatically adjusts.

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🧠 AUTOMATIC PROFILE CONTROL

From a compact set of component dimensions, the cycle automatically manages:

✅ Main groove geometry

✅ Groove depth

✅ Corner blend geometry

✅ Left-side profile

✅ Right-side profile

✅ Groove center

✅ Roughing positions

✅ Peck progression

✅ Full tool clearance

✅ Controlled re-entry

✅ Final finishing sequence

✅ Groove quantity

✅ Groove positioning

✅ Groove spacing

✅ Automatic repeated machining

The operator concentrates on the required finished component rather than manually creating the complete toolpath.

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⚙️ DESIGNED AROUND THE CUTTING TOOL

The machining strategy also accounts for the effective cutting geometry of the grooving tool when generating the finished curved profile.

This allows the cycle to maintain the required relationship between:

✅ Main finished radius

✅ Corner fillet radius

✅ Groove root

✅ Outside diameter

✅ Cutting-tool geometry

The result is a reusable machining strategy designed specifically for producing controlled blended-radius profiles.

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💡 WHY BLENDED RADIUS GROOVING?

Many groove applications require more than a simple semicircular plunge.

The transition between the groove and outside diameter can be equally important to the finished component.

A controlled corner blend can provide:

✅ Smoother geometric transitions

✅ Reduced sharp corners

✅ Better finished-profile consistency

✅ More controlled component geometry

✅ A more complete machined profile

The Parametric Radius Groove & Fillet Blend Cycle combines the main groove and its corner transitions into one stored machining strategy.

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🏭 BUILT FOR REUSABLE PRODUCTION

The Parametric Radius Groove & Fillet Blend Cycle is designed as a reusable production tool rather than a one-job CNC program.

Once configured and proven, the same cycle can be reused across different component configurations by changing the required job dimensions.

Ideal for:

✅ Round-bottom external grooves

✅ Radiused groove profiles

✅ Blended groove profiles

✅ Roller components

✅ Pulley-style components

✅ Guide components

✅ Formed groove applications

✅ Maintenance components

✅ Replacement components

✅ Prototype machining

✅ Repetitive production parts

✅ CNC automation applications

✅ Single-groove production

✅ Multiple-groove production

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⚙️ ONE CYCLE — MULTIPLE COMPONENT CONFIGURATIONS

Different stock diameter?

Change the job dimensions.

Different groove depth?

Change the root diameter.

Different main radius?

Change the groove radius.

Different corner blend?

Change the fillet radius.

Need one groove?

Set one.

Need multiple grooves?

Change the quantity.

Different groove spacing?

Change the center spacing.

The complete machining strategy remains stored inside the cycle.

No need to rebuild the entire CNC program every time the component changes.

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🌐 MULTI-CONTROLLER SUPPORT

Controller-specific packages are available for:

✅ FANUC

✅ SIEMENS

✅ HAAS

✅ MAZAK

✅ MITSUBISHI

✅ OKUMA

✅ HEIDENHAIN

✅ FAGOR

✅ GSK

Controller-specific versions maintain the same core machining concept while adapting the program structure to supported CNC systems.

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📦 COMPLETE DOWNLOAD PACKAGE

Package includes:

✅ Parametric Radius Groove & Fillet Blend Cycle

✅ Reusable CNC machining cycle

✅ Standalone controller version

✅ Callable cycle version where supported

✅ Complete user guide

✅ Complete training module

✅ Setup instructions

✅ Parameter explanation

✅ Main-radius setup guidance

✅ Corner-fillet setup guidance

✅ Chip-control strategy explanation

✅ Full-retract peck explanation

✅ Groove-spacing setup guidance

✅ Single-groove setup guidance

✅ Multiple-groove setup guidance

✅ Outside-to-center finishing explanation

✅ First-run setup guidance

✅ Prove-out procedure

✅ Controller-specific packages

✅ Reusable production-cycle structure

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🔨 CHIP-BREAK CONTROL BUILT INTO THE CYCLE

The machining strategy is designed to repeatedly interrupt the roughing cut and completely clear the tool from the component.

Instead of relying on one continuous deep cutting movement, the cycle automatically manages the cutting progression.

This gives the operator a reusable chip-control strategy for every component programmed with the cycle.

Full retract.

Clear the groove.

Return through the machined area.

Continue cutting.

The process repeats automatically until the rough profile is complete.

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🛒 AVAILABLE STANDALONE OR INSIDE CNC AUTOMATION PRO

The Parametric Radius Groove & Fillet Blend Cycle is available as a standalone downloadable package or as part of CNC Automation Pro.

CNC Automation Pro provides access to reusable custom CNC cycles, CNC macros, programming modules, software and CNC training resources.

CNC Automation Pro:

https://payhip.com/b/9IpYU

MacroMill CNC:

www.macromillcnc.com

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PARAMETRIC RADIUS GROOVE & FILLET BLEND CYCLE

One reusable cycle.

Single or multiple grooves.

Full-retract chip control.

Parametric main radius.

Automatic corner fillet blending.

Outside-to-center finishing.

Built for reusable CNC production.