Coated Abrasive Tools
General Information
Advantages
Factors influencing the grinding
result
■■High flexibility.
■■High stock removal due to aggressive
■■Tool wear and workpiece temperature
coated abrasive product.
load:
■■Flaps wear off uniformly and without
The heat load on the workpiece material and
residue on the workpiece surface, ensuring
the tool wear can be reduced substantially
adequate availability of sharp grit at all
by working with reduced contact pressure
times.
and adding a cooling lubricant (grease/oil).
■■Due to the special mounting system, the
■■Material removal rate:
face of the wheel can be worked up very
To achieve higher stock removal it is recom-
close to the edges and corners.
mended to use coarser grit rather than more
The coated abrasive elements are arranged
contact pressure, which may result in prema-
radially around the tool axis in a fan-type con-
Application examples
ture tool wear and workpiece overheating.
figuration. Due to their flexibility, they adapt
■■Surface roughness:
■■Fine grinding on large radii, e.g. during
ideally to the contours of the workpiece. The
Use of a higher peripheral speed will pro-
assembly of tanks, kitchens and process
abrasive grain is embedded in a resinoid bond
duce a slightly finer surface finish. Increasing
equipment.
on the strong flexible backing cloth.
the contact pressure will produce a some-
■■Removal of major surface irregularities (e.g.
Flap wheels are designated “Element grinding
what coarser surface.
weld dressing).
discs” according to ISO 5429.
The surface roughness obtained increases
■■Production of homogeneous surface pat-
Flap wheels ø 100, 150 and 165 mm are sup-
with the softness of the material (for tools of
terns on large surfaces and contours with
plied with a 25,4 mm centre hole.
identical grit size).
handheld tool drives.
Flap wheels ø 200 and 250 mm are supplied
■■Fine-grinding in preparation of high-gloss
with a 44,0 mm centre hole.
Safety notes
polishing.
■■Also suitable for robotic and stationary
Flap wheels must always be used with match-
usage.
ing clamping flanges.
The maximum permissible circumferential
Recommendations for use
speed is
Safety recommendations
■■50 m/s for the FR flap wheels
■■Flap wheels perform best at the recom-
■■and 80 m/s for the FR-WS flap wheels.
mended peripheral speed of 15-30 m/s,
= Wear eye protection!
where the optimum balance between stock
For safety reasons, it is imperative to remain
removal, surface finishing quality, work-
within the stated RPM limit at all times.
piece temperature loads and tool wear is
achieved.
= Wear hearing protection!
■■Suitable drive systems include flexible
shafts, straight grinders and bench grinders.
■■The drive system must provide an output of
= Wear gloves!
1.000 to 1.500 watts.
■■Use of the correct grinding oil on each
different material can substantially increase
the service life and abrasive performance of
= Read the instructions!
flap wheels. For detailed information and
order data on grinding oils, please refer to
page 110.
Cutting speed flap wheels
10.000
9.000
In this diagram, the cutting speeds are repre-
8.000
sented using blue diagonal lines. The vertical
7.000
line representing the tool dia. meets the given
cutting speed (diagonals). From its point of
6.000
intersection with the diagonal line for a given
peripheral speed, proceed horizontally to the
5.000
4.500
left margin where you will find the corre-
sponding rotational speed [RPM] of the flap
4.000
wheels.
3.500
3.000
Example:
2.750
FR 16550 / 25,4 A 80
2.500
Cutting speed: 15-30 m/s
2.250
Speed range: 1.700-3.500 RPM
2.000
1.750
1.500
1.250
1.000
100
150
165
200
250
Tool diameter D [mm]
62
I
204
