Pocket/Cavity: Cavity Diameter 10-200 mm, Depth 5-100 mm

Component Specifications

Definition

A pocket or cavity is a precisely machined recess in a starwheel or pocketed disc component, designed to securely hold and transport individual items during automated manufacturing processes. These cavities maintain consistent product orientation and spacing as the disc rotates, enabling synchronized transfer between stations in packaging, assembly, or sorting systems. Critical dimensions include depth, diameter, and angular positioning relative to the disc's center.

Working Principle

The pocket/cavity operates on rotational indexing principles. As the starwheel or disc rotates, each cavity sequentially aligns with infeed and discharge points. Products are deposited into the cavity at the loading station, carried through the rotation arc, and released at the unloading station. The cavity's geometry ensures product stability during transport, while precise machining allows for high-speed operation with minimal vibration or misalignment.

Materials

Typically manufactured from hardened tool steel (e.g., AISI D2, H13), stainless steel (304 or 316), aluminum alloys (6061-T6), or engineering plastics (POM, UHMW-PE) depending on application requirements. Surface treatments may include nitriding, chrome plating, or PTFE coatings to reduce friction and wear.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Depth	5-100 mm
Hardness	45-60 HRC for steel
Tolerance	±0.05 mm
Surface Finish	Ra 0.8 μm or better
Cavity Diameter	10-200 mm
Operating Speed	Up to 300 cycles/minute

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 2768, DIN 7168

Parent Products

This component is used in the following industrial products

Starwheel or Pocketed Disc

A rotating disc with precisely shaped pockets that receives, orients, and transfers bottles in an unscrambling system.

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Engineering Analysis

Risks & Mitigation

Wear leading to dimensional inaccuracy
Product jamming due to cavity contamination
Fatigue failure from cyclic loading

FMEA Triads

Trigger: Abrasive product contact
Failure: Cavity diameter expansion beyond tolerance
Mitigation: Implement hardened steel surfaces with wear-resistant coatings

Trigger: Improper cleaning procedures
Failure: Material buildup causing product jamming
Mitigation: Establish automated cleaning cycles and inspection protocols

Trigger: High-cycle operation
Failure: Fatigue cracks at cavity edges
Mitigation: Design with radiused edges and regular non-destructive testing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 1101, dimensional tolerances per ISO 2768-m

Test Method

Coordinate measuring machine (CMM) verification, surface profilometry, hardness testing per ASTM E18

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Pocket/Cavity

Manufacturer profiles associated with Pocket/Cavity.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What factors determine cavity material selection?

Material choice depends on product abrasiveness, required precision, operating speed, and sanitation needs. Steel offers durability for heavy items, aluminum reduces inertia for high-speed applications, and plastics prevent product damage for fragile items.

How are cavities maintained in production environments?

Regular inspection for wear, cleaning to prevent material buildup, and lubrication of bearing surfaces. Replacement is recommended when dimensional tolerances exceed ±0.1 mm or surface defects appear.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Pocket/Cavity