JAZ Messageboard

he solution for your problems

Take part in our forum and we will attend to your inquiries.

Home
Technical information / Brushes

Technical information: Brushes

The selection of the right type of brush depends on the type of finishing required (fine or coarse), and the characteristics of the surface to be brushed (stainless steel, carbon steel, wood, etc…).

Besides that, in the case of the brushes fixed in a machine, it is necesary to know the main features of the machine in order to choose the right brush type:

The maximum diameter allowed.
The machine speed or RPM.
The arbor hole diameter or the thread type (M14, 5/8”-11, etc…).

Trim Length

A short trim length makes the brush face rigid and consequently the brush removal capacity is higher.
With a longer trim length the brush becomes flexible and it provides a uniform brushing even on irregular surfaces.

Crimped Vs. Knotted wire

Crimped wire brushes, because of their higher flexibility, are appropiate to work on uneven surfaces and they obtain a more regular and fine finishing.
Twist knot wire, offers longer life and a higher removal capacity but a more rough finishing.

Wire Diameter

Wire gauge of a brush determines the type of surface finishing:

A thicker wire provides for a more aggressive brushing action.
A finer wire provides for a less aggressive brushing action with a finer finishing.

MACHINE (Normal Speed)	MOST COMMON BRUSHES	MODEL	BRUSH DIAMETER
Bench Grinders	Crimped & Knotted Wheels	CT, CU, CAM, CCA, DNA, CTP	75 mm (3”) TO 350 mm (14”)
Angle Grinders (5.000 - 8.500 RPM)	Crimped & Knotted Wheels	CT, CAM, CPL, CCA,CTP	100 mm (4”) TO 175 mm (7”)
	Crimped & Knotted Cups	TO, TT, TCA, TOG, TTG, TCAG, TNA, TOP, TTP	80 mm (3.1/4”) TO 150 mm (6”)
	Flap Discs	DLZ, DLO.
Mini Angle Grinders (10.000 - 12.500 RPM)	High Speed Cups, Discs & Wheels	HSC, HST, HSD, HSK, HSP, HSR, HCA, HSCG, HSTG, HCAG, HSKG, HSDG, HSCP, HSTP, HSRP	65 mm (2.9/16”) TO 115 mm (4.1/2”)
Mini Angle Grinders (10.000 - 12.500 RPM)	Flap Discs	DLZ, DLO
Drill & Pneumatic Tools (15.000 - 20.000 RPM)	Wheels & End Brushes with Shank	CDE, CAE, B.	12 mm (1/2”) TO 75 mm (3”)
Drill & Pneumatic Tools (15.000 - 20.000 RPM)	Flap Wheels	AL
Drills (4.500 RPM)	Wheels, Cups & End Brushes with Shank	BDER, BTE, BBC, BDOR, CNA	26 mm (1”) TO 100 mm (4”)
Drills (4.500 RPM)	Flap Wheels	AL

Wire Brushes Vs. Hard Abrasives

Wire brushes act as an impact tool removing oxide, paint or other adherence from the surface without damaging the base material, as opposed to hard abrasives which will remove the base material along with the surface adherence. Wire brushes are much more flexible allowing the ability to clean difficult areas to reach and adapt to irregular surfaces, which bonded and coated abrasives can not.

Safety Warnings

The European Standard EN 1083-2 about Safety Requirements in the use of Power-driven brushes states the safety instructions that all brush operators must observe. These requirements and common safety practices will reduce the likelihood of physical injury and brush fail:

Wear safety goggles, protective clothing and equipment.
Observe all speed restrictions indicated on the brushes, packaging or catalogue. And do not exceed Maximum Safe Free Speed (Max. R.P.M.) under any circumstances.
Keep all machine guards in place.
Do not use deteriorated brushes.
Oxidation or any other chemical alteration in the wire may cause malfunctioning.
Store brushes in original packaging, in a clean and dry location protected from dust, humidity and other environmental effects.

Brush Usage Recommendations

The brushing must be performed with wire ends.
Excessive pressure causes over-bending of the wires, increasing their fatigue and therefore, causing a premature breaking, reducing significantly their working life.
If you need a higher removal capacity, instead of higher pressure on the brush, we suggest the following:

Use a more aggresive brush: A brush with a thicker wire, with less trim lenght or twist knot wire instead crimped wire.
Increase the brushing speed with a model who can work faster or with a bigger diameter, in the case of the wheel brushes.

Recommended Vs. Maximum R.P.M.

The power tool speed influences the performance of the brush and the safety of the operator. If load speed marked on the power tool is higher than the brush MAXIMUM R.P.M., do not mount brush. Maximum R.P.M. are indicated on brush side-plates and shall never be exceeded.

MAXIMUM R.P.M. are the maximum R.P.M. at which the brush could be run with no work applied (spinning free). It is merely a safety indication for the user, not the recommended operating speed.

MAXIMUM and RECOMMENDED R.P.M. are specified in each chart, according to the brush model, diameter, etc.
For most brushing applications optimum results are achieved at the RECOMMENDED R.P.M.

Jaz Zubiaurre S.A.

Technical information: Brushes