Custom Disc Brushes

A disc brush is a round backing, or hub, with tufts, abrasive filament, foam or pads set into one face. The machine drives it through the center and holds the face against the work, so the fill touches the surface across a full circle at once.

A roller brush turns on an axis parallel to the surface and touches it along a single line. That line contact is good at flicking loose debris forward into a hopper or off a conveyor. A disc gives broad, even pressure on a flat area, which is what scrubbing, polishing and surface finishing need.

The two are often used together. A street sweeper runs side discs to pull debris out of the curb and a cylindrical main brush to lift it. A glass washing line runs rows of discs on the face of the sheet and rollers elsewhere on the line.

A disc is the wrong shape when the surface cannot take circular scratch marks, when debris has to be lifted rather than scrubbed, or when the brush has to reach inside a bore. Those jobs belong to roller, strip and tube brushes.

Most disc brushes fall into five groups. These are the jobs our own disc brushes are built for:

Car wash side brushes are disc brushes too, with long, soft PP fill. So are the foam discs that wipe liquid off a process line between stations.

Across the disc brushes we have built, outside diameters run from 20 mm for small glaze-line discs to 700 mm for solar panel cleaning. Most floor machine discs sit between 250 and 500 mm.

The other dimensions follow the machine rather than a catalog:

• Trim, the visible length of the fill: 10–60 mm on PCB and finishing discs, 30–35 mm on floor scrubber discs, and up to 180 mm on car wash side brushes. A shorter trim is stiffer and more aggressive; a longer one follows uneven surfaces.
• Filament diameter: from 0.05 mm on carbon fiber wafer discs to 2.5 mm on coarse diamond deburring discs. Floor scrubbing usually runs 0.3–1.0 mm.
• Bore or arbor: 6–25.4 mm on small spindle discs and 10–50 mm on PCB and tile-line discs, plain, keyed or with a set screw.
• Operating speed: about 150–350 rpm for floor pads, 200–400 rpm for solar discs, 1,000–3,000 rpm for diamond deburring and 3,500–4,500 rpm for abrasive glass discs, depending on diameter.

We build to your drawing, to a sample, or to the machine model. If all you have is the worn brush, its outside diameter, bore and a photo of the back are usually enough to start.

The fill decides what the disc can do. The machine only decides how hard and how fast it is pressed.

• Nylon (PA6, PA66, PA612): the general-purpose fill for floor scrubbing and industrial cleaning, with good wear life and bend recovery. Standard nylon softens a little in water.
• PBT: keeps its stiffness wet and recovers well, so it suits wet floor scrubbing, glass edge cleaning and solar panels. UV-stabilized grades hold up longer outdoors.
• PP: the economical choice for wet, chemical and outdoor work such as pools, car washes and sweeper side brushes. It wears faster than nylon on abrasive debris.
• Abrasive nylon: nylon loaded with silicon carbide, aluminum oxide or diamond. It cuts rather than sweeps, for deburring, glass frosting, tile glaze drips and heavy floor soil. Grit runs from 24# for burr removal to 1000# for pre-polish.
• Carbon fiber and conductive filament: for wafer and PCB equipment where the brush has to drain static rather than build it.
• Foam and melamine: not bristles at all. Open-cell PU foam wipes and absorbs liquid; melamine foam lifts scuffs and stains from sealed floors.

The hub matters too. PP and PVC hubs are light and resist water and many chemicals, but a standard PP hub is limited to about 80°C and PVC to about 60°C. Aluminum, stainless steel and PEEK hubs take higher speeds or temperatures.

The mount is the part buyers most often get wrong, and a disc that does not fit cannot be tested at all. There are four common interfaces:

• Snap-fit or clutch plate: floor scrubbers and many sweepers. The lugs have to match the machine’s drive block, so we need the machine make and model, or the old brush.
• Quick-change coupling: car wash arms, solar cleaners and pool poles, matched to the bolt circle, pilot bore or pole taper.
• Bore with keyway, set screw or hub: spindle-mounted discs on PCB, tile and glass lines, machined to the shaft diameter and drive feature.
• Drive plate or bolt circle: larger finishing discs bolted to a plate, drilled to the customer’s pattern.

Tell us the rotation direction too. Some fill patterns and angled tufts only work one way round.

A full-face disc spreads pressure evenly and suits general scrubbing and washing. An open-center ring disc leaves room for a hub, a spray nozzle, a sensor or a feature on the part, while the outer ring does the work.

Segmented and open-row layouts leave channels between the tuft groups. Water, slurry and detergent can escape through them instead of building up under the brush, which is why our wet floor discs use an open-row layout. Concentric rings give a dense, even face for car wash and solar discs.

Side or edge discs are flared or angled so the fill reaches past the machine’s own footprint, into curbs, wall edges and corners. Replaceable-segment discs let a worn sector be changed without discarding the whole backing.

Most early failures come from how the disc is run rather than how it was made. These are the usual causes:

• Too much pressure. Pressing harder splays the fill, heats it and loads the drive, so the disc wears faster without cleaning better. Set the contact to the lightest pressure that gives the result.
• Too much speed for the diameter. High-speed discs are balanced for a rated speed. Never run a disc above the speed marked on its hub.
• Imbalance. Discs on tile, PCB and glass lines are statically or dynamically balanced to their running speed. An unbalanced disc chatters and leaves marks on the surface.
• Running dry when it should run wet. Abrasive glass discs last longer and raise less dust with water. Floor discs need detergent flow to carry the slurry away.
• The wrong direction. Rotation decides where debris and liquid are thrown: toward the collection point, or back onto clean surface and into the bearings.

A short description and a photo are enough to start. These details let us quote without a second round of questions:

• The machine make and model, or a drawing of the hub, bore and drive feature.
• Outside diameter, trim length and, if known, the filament diameter.
• What the disc cleans or finishes, and the surface material.
• Wet or dry use, the chemicals or coolant, and the working temperature.
• Running speed and rotation direction.
• For abrasive discs, the grit and the finish you need.
• The quantity per order.

If you are replacing a disc that wears too fast or marks the surface, tell us what it is doing wrong. That usually points to the change: a different fill, a different trim, or a different pattern.