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White Wool Pen Brush Ø19-25mm × 42mm
White Wool Pen Brush Ø19-25mm × 42mm - Image 2

White Wool Pen Brush Ø19-25mm × 42mm

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The WanHu pen brush in White Wool. Specifications: Diameter: 19/22/25mm · Length: 42mm · Rod Diameter: 2.35mm · Core Diameter: 10.5mm.

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    SKU: WANHU-PB-33 Category: Tags: , ,

    Description

    Product description

    This WanHu pen brush is made from natural wool fibre. Part of the Pen Brush range, it comes in several colours and sizes so you can match it to your machine and finish requirement.

    Uses

    Suitable for cleaning, deburring and polishing metal, jewellery, moulds and woodwork. Mount the pen brush at moderate speed and let the bristles do the work — excess pressure shortens service life.

    Specifications

    Diameter 19/22/25mm
    Length 42mm
    Rod Diameter 2.35mm
    Core Diameter 10.5mm

    More colours & sizes in this range

    Additional information

    Diameter

    19/22/25mm
    Length

    42mm
    Rod Diameter

    2.35mm
    Core Diameter

    10.5mm

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    Safe Operating Speed

    A bigger wheel must run slower. The limit is set by peripheral speed (how fast the rim travels), not by a fixed RPM number — so the safe RPM drops as the diameter grows.

    Recommended peripheral speed20–30 m/sGeneral standard for metal mirror finishing
    Above 30 m/sDo not runWheel can shed or burst, and the workpiece burns black
    Safe maximum speed by wheel diameter
    Wheel diameterSpec codeMax. safe speedPeripheral speed at that limit
    Ø 100 mm4"4 × 50≤ 6,000 RPMMaker rating on small wheels — the arbor and guard set the real ceiling31.4 m/s
    Ø 150 mm6"6 × 50≤ 3,000 RPMMost common size — many makers rate it at 2,800 RPM23.6 m/s
    Ø 200 mm8"8 × 50≤ 2,200 RPM23.0 m/s
    Ø 250 mm10"10 × 50≤ 1,800 RPM23.6 m/s
    Ø 300 mm12"12 × 50≤ 1,400 RPM22.0 m/s

    Spec code format: diameter (inch) × ply count — 4 × 50, 5 × 50, 6 × 50, 7 × 50, 8 × 50, where 50 ply means 50 cotton layers. Finished thickness is 12 mm across the whole range.

    Check your own setup

    Peripheral speed = π × diameter (m) × RPM ÷ 60

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