Power brushes
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Frequently asked questions
How do knotted and crimped wire brushes differ?
Knotted wire is twisted into tufts, stiff and aggressive, suiting weld slag, heavy rust and mill scale. Crimped wire is more flexible and covers the surface evenly, suiting light cleaning and surface texturing. Knotted brushes also shed fewer wires under heavy load.
Can carbon steel brushes be used on stainless steel?
It is best not to. Carbon steel wire leaves iron particles on stainless that later cause rust staining. Use stainless wire brushes reserved only for stainless work. For aluminium, stainless or non-metallic filaments avoid contamination.
How do you choose between wheel, cup and end brushes?
Wheel brushes work with the edge, suiting grooves, fillet welds and edges. Cup brushes cover large flat areas. End brushes on a grinder shank or drill reach into holes and tight corners. The arbor thread must match the tool, commonly M14 or 5/8-11 on angle grinders.
Why does wire brushing need extra eye and face protection?
Wires fatigue and break during use and are thrown off at high speed, able to penetrate thin clothing. Wear Z87+ eyewear plus a face shield and covering clothing, and do not stand in line with the brush's plane of rotation. Pressing harder does not clean faster; it bends the wires over and breaks them sooner.
Is it normal for a new brush to shed wires?
Some loose wires flying off in the first seconds is normal, so run the brush unloaded behind the guard for about a minute before use. Continuous shedding usually means overspeed, excessive pressure or fatigued wire that needs replacing. The tool speed must not exceed the maximum marked on the brush.
How does wire diameter affect brushing results?
Thicker wire is stiffer and more aggressive, suiting rust, weld slag and heavy paint removal. Finer wire is more flexible, gives a smoother finish and leaves fewer marks. Brush life also depends on wire diameter and the free length of the filaments.
How much pressure should be applied with a power brush?
Only light pressure is needed so the wire tips meet the surface, since the tips do the work. Pressing hard bends the wires over, fatigues them and causes early breakage while reducing brushing action. If more aggression is needed, change to a thicker wire or a knotted brush.
How does rotational speed affect a power brush?
A brush must run no faster than the maximum speed marked on it. Below that limit, higher speed makes the wire tips act stiffer and brush more aggressively, while lower speed suits light finishing. Overspeeding causes wires to be thrown out dangerously.
