NAMPOWER ™ 

Nylon Abrasive Material Brushing Tools

Resource Guide for information on Tool selection, Grit selection, suggested RPM’s and More.

RESOURCE GUIDE
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Nampower ™ Disc Brushes

ChipX is proud to offer the highest quality professional grade tools for deburring, edge radiusing and surface finishing applications on the market today.

Nampower™ Disc Brushes are easily integrated into today’s automated machinery, CNC machining centers, transfer lines and robotic cells.

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What are they?

Composed of flexible abrasive nylon filaments bonded to a fiber reinforced thermoplastic base.

These abrasive disc brushes contain a unique combination of both ceramic and silicon carbide abrasive, that produce maximum burr removal rates and provides an optimum surface finish at the same time.

Available in 2 different styles

Heavy deburring & general purpose finishing

TURBINE / DOT

DOT STYLE

Used for general purpose edge deburring and surface finishing applications. Dot style brushes provide greater flexibility and allow entry into small holes and spaces with ease.

TURBINE STYLE

Ideal for medium and heavy deburring applications. The Turbine style brush has a high density fill that is ideal for short cycle times and long tool life.

Easily Integrated

INTO TODAY’S AUTOMATED MACHINERY, CNC MACHINING CENTERS, TRANSFER LINES AND ROBOTIC CELLS

Typical NAMPOWER ™ Applications

  • Deburring
  • Rust Removal
  • Gasket Cleaning & Removal
  • Roughing
  • Finishing prior to painting and plating
  • Removal of silicon glue, paper gaskets and flash from rubber and plastic
  • Pre-cast  concrete mold cleaning
  • Spot finishing
  • Improve surface finish
  • Weld cleaning
  • Plastic automotive parts

Typical NAMPOWER ™ Applications

For More Aggression

More Info
  • Reduce trim length
  • Use larger diameter brush
  • Increase grit size
  • Use heavy density bristle brush
  • Increase spindle RPM
  • Increase depth

For Less Aggression

More Info
  • Increase trim length
  • Use smaller diameter brush
  • Use finer grit size
  • Use medium less density bristle brush
  • Reduce pressure

For Contouring

More Info
  • Increase trim length
  • Use fine grit bristle
  • Use light density bristle brushes
  • Increase pressure

For Fine Finishing

More Info
  • Use brush with a coolant
  • Use long bristle brush
  • Increase spindle RPM

For Coarse Finishing

More Info
  • Use brush without coolant
  • Increase grit size
  • Use smaller diameter brush
  • Reduce spindle RPM

For Smear Free

More Info
  • Use brush with a coolant work piece
  • Use smaller diameter brush
  • Reduce spindle RPM
  • Decrease pressure

Trim Length Selection

The Nampower disc brush is available in 18mm and 38mm trim lengths. Trim length selection is about flexibility versus aggressiveness. Longer trim lengths are less aggressive and more flexible while shorter trim lengths are less flexible and more aggressive. Burr size, part shape and conformity, radius requirements and final finish requirements are all factors affecting trim length selection.

Grit Selection

Grit selection is highly dependent on the starting surface finish and the amount of material refinement required. The general rule of thumb is to choose the coarsest grit possible that will still yield the required surface finish. A fine grit tool used on a coarse starting finish will have less effect on the overall finish improvement as a coarse grit tool followed by a finer grit tool. Coarse grits are recommended for use on heavier burrs or where a fine surface
finish is not required.

Grit

80

120

180

320

Starting RA

50-60

40-50

30-40

20-30

Part Coverage & Brush Diameter Selection

The brush diameter should ideally be larger than the cutting tool used to machine the part. If a smaller brush is required due to fixture restrictions, the centreline of the brush tool should be aligned with the targeted edge with a minimum of 25mm of overlap.

Tool Path & Rotation

Tool Path

The brush should be rotating at full speed and start and finish its path completely off the part.

Rotational Direction

The brush should be rotated in the direction opposite of the cutting tool that created the burr on its initial pass.

Suggested operating parameters

Disc Speeds

The speeds listed in the table above are a guide to be used in establishing the optimum operating RPM. Many factors affect optimum RPM including the brush diameter, trim length, filament diameter, fill pattern, cut depth and if the brush is being run dry or with fluid. The maximum RPM marked on the brush may not be the optimum working speed. It is recommended to stay under 720 m/min in dry applications and 1060 m/min in wet applications. A 150mm diameter brush running at 1400 RPM is much more effective than one running at 2800 RPM. Excessive speed, especially with longer trim length, causes the filament to flair and bounces off the work piece. Coarse grit filaments can spin faster than fine grit filaments without flaring. Turbine style fill can spin faster than dot style without flaring. Filaments used with coolant can spin faster than dry applications without overheating and smearing. Typically, higher spindle speeds improve the finish and lower speeds enhance deburring.

Diameter

50mm

60mm

80mm

100mm

125mm

150mm

80 Grit

6500rpm

5500rpm

4500rpm

1850rpm

1600rpm

1350rpm

120 Grit

6250rpm

5000rpm

4250rpm

1800rpm

1550rpm

1300rpm

180 Grit

4000rpm

4000rpm

3500rpm

1750rpm

1750rpm

1250rpm

320 Grit

3500rpm

2750rpm

2500rpm

1700rpm

1450rpm

1200rpm

Brush Depth

Cut depth should be set up to 10% penetration of the available trim length on the finer filament grits (180, 320) and up to 5% penetration on coarser grit filaments (80, 120). Dot Style brushes can be set for a deeper penetration than Turbine Style brushes. Spindle speed is usually decreased with increased depth of interference so the filaments can conform smoothly to part contours.

Brush Style

Dot Style
Turbine Style

Cut Depth

0.4 – 3.8mm
0.1 – 2.4mm

Feed rate

Feed rate is affected by many factors including burr size, work piece material, surface contours and finish requirements. Contoured surfaces are processed at slower speeds and greater depth of interference than flat surfaces. Starting feed rates between 760 and 2030 mm/min are recommended, but the final feed rate is application specific and must
be developed through deburring trials.

Material

Non-Ferrous
Cast Iron
Mild Steel and Ductile Iron
Stainless and Alloy Steels
Titanium and High Nickel Alloys

Feed Rate

2030 mm/min
1520 mm/min
1270 mm/min
760 mm/min
760 mm/min