Product Positioning

Purpose-Built for Inside Corners, Concave Areas and Root Blending

Cup/Bell shape flap wheels are positioned as specialized wheels for inside corners and concave surfaces, addressing limitations of cylindrical/conical wheels where contact is insufficient or unstable at inner roots, concave areas, and groove bottoms.
They are widely used for root blending, inside-corner brushing, and texture unification on concave profiles—ideal for applications demanding high accessibility and cosmetic consistency.

 

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Technical Specifications

Configurable by Cup Geometry, Bore and Abrasive System

Item	English Specification
Product Type	Cup/Bell shape flap wheels
Abrasive	AO / Zirconia / Ceramic options
Construction	Radial flap construction (Cup/Bell)
Outer Diameter	1.25″–10″(30–250 mm) (Extendable)
Width / Cup Depth	Customizable
Arbor Hole	1/4″–2″ (Customizable)
Grit Range	P60 – P240 (Extendable)
Max RPM	Marked per size & Standard

 

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Processing Logic

The Advantage is Contact Direction Control

The key is not more aggressiveness, but controlling contact direction via geometry:

• Standard wheels often “edge hit” inside roots, increasing gouging risk;
• Cup/bell wheels allow flaps to engage the root more conformably, reducing deep scratches;
• On concave radii, contact becomes more uniform and scratch patterns are easier to unify.

 

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Backing Structure & Performance Limits

Specialized Profile Tool, Not a General Flat-Sanding Wheel

• Strengths: superior access to inside corners/concave areas; smoother root blending
• Limits: not for large flat leveling or heavy stock removal

More sensitive to angle/feed: excessive pressure, dwelling, or incorrect posture increases gouging and overheating risk

 

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Machine Compatibility & Operating Conditions

Bore-Mounted Wheels for Profile Finishing Stations

• Machines: finishing machines, sanders/polishers, dedicated arbors (bore-mounted)
• Recommended conditions: medium to low pressure, stable surface speed, continuous movement along profiles
• Must match: bore/arbor size, cup geometry (diameter/depth), and RPM rating (never overspeed)

 

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Engineering Comparison

Cup/Bell vs Conical vs Cylindrical: Inside-Corner Capability

Comparison	Cup/Bell Wheels	Conical Wheels	Cylindrical Wheels
Inside-root access	★★★★★	★★★★	★★
Concave conformity	★★★★★	★★★	★★★
Large flat efficiency	★★★	★★★	★★★★★
Scratch consistency	Excellent	Excellent	Excellent
Forgiveness	Medium	Medium–High	High
Typical use	roots/concaves	corners/angles	flats/OD

 

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Typical Applications & Industries

Root Blending and Inside-Corner Finishing for Metal Profiles

Inside-corner brushing and root texture blending on stainless

Root blending for fillet welds and inner-corner welds

Groove bottoms, concave surfaces, internal radii finishing

Internal dressing for hardware parts, profiles, and frame structures

 

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Grit Range & Recommended Use

Grit Strategy for Inside-Corner Blending

Typical recommendation

• P60–P80: root blending and profile dressing (balanced)
• P100–P120: general inside-corner brushing and scratch unification (most common)
• P150–P240: cosmetic refinement and rework repair at roots

 

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OEM & ODM Capability

Geometry-Driven Customization for Inside-Corner Work

OEM/ODM supported: cup/bell geometry (diameter, depth, lip angle), OD/width/bore standards, flap density & hardness, abrasive system, core material & balance grade, private label/packaging—engineered for inside-corner roots and concave finishing.

 

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Why Choose Us

Root Finishing Needs Geometry Accuracy and Batch Stability

Inside-corner root work quickly reveals structural instability:

Geometry deviation leads to uneven contact, gouging, and inconsistent texture. We control cup geometry consistency, dynamic balance, and layup/bond stability to deliver repeatable blending and scratch results in root finishing.

 

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Usage & Storage Recommendations

Keep the Root Cool—Use Controlled Pressure and Continuous Motion

• Never over speed; follow rated RPM and ensure secure mounting with guarding
• For roots, use medium to low pressure with continuous motion to avoid heat spots and gouging
• For cosmetic parts, step through grits to minimize deep scratches and rework
• Store dry and shaded; avoid moisture and compression; reseal after opening