ANSI B7.1-2010
Explanatory Information
(NOT PART OF ANSI STANDARD)
5 Flanges
E 5.1 General requirements
5.1 General requirements
All abrasive wheels shall be mounted between
flanges which shall not be less than one-third
the diameter of the wheel.
Exceptions:
1.
Mounted
page 25.)
wheels
(section
1. 4 . 1 9 ,
2. Portable cup, cone or plug wheels with
threaded inserts or projecting studs. These
wheels shall be mounted against a straight
unrelieved flange. (See table 17, page
83.)
3. Abrasive disc wheels (inserted nut, inserted
washer and projecting stud type).
The major stresses produced in operating
abrasive wheel tend to combine and become
greatest at the hole. It is, therefore, important
that stresses due to mounting and driving act
as far from the holes as practicable.
This is best accomplished by using flanges
at least as large as those listed in tables 14
through 21, pages 81 through 86.
Flanges should be at least the minimum diameters specified, identical in diameter and
radial bearing surface to avoid cross bending
pressures and stresses in the wheel structure.
In many cutting-off operations, better results
may be obtained by using flanges larger than
the minimum requirement.
5. Cylinder, cup or segmental wheels that are
mounted in chucks.
Blotters (compressible washers) should always
be used between metal flanges and abrasive
wheel surfaces for uniform distribution of flange
pressure.
6. Types 27, 28 and 29 wheels (See section 5.4, page 77).
See section 5.6, page 78, for exceptions regarding the use of blotters.
7.
Flanges must be checked periodically for flatness, burrs and wear.
4. Plate mounted wheels.
Internal wheels less than 2″ in diameter.
8. Modified Types 6 and 11 wheels (Terrazzo).
9. Cutting-off wheels, Types 1 and 27A (see
sections 5.1.1 and 5.1.2.1, pages 73
and 74).
Illustration 62 – Note the flanges used here are at
least 1/3 the wheel diameter, finished all over, and
free of rough or sharp edges
72
ANSI B7.1-2010
5.1.1 Type 1 cutting-off wheels
E 5.1.1 Type 1 cutting-off wheels
Type 1 cutting-off wheels shall be mounted
between properly relieved flanges which have
matching bearing surfaces. Such flanges shall
be at least one-fourth the wheel diameter. See
table 14, page 81, column C, for proper bearing surface.
Exceptions to the standard requiring that flanges
be 1/4 of the wheel diameter have been made
for steel-centered diamond abrasive cutting-off
wheels. This is because these steel-centered
wheels are not only stronger, but also more
ductile than bonded abrasive wheels. Exception
A allows for flanges to be 1/5 the diameter of
the wheel, while exception B allows flanges to
be 1/6 the diameter. Exception D for wall saws
allows flanges smaller than 1/6 the diameter for
wheels larger than 30″, but only when proper
step cutting procedures are used. The reason
for this is that wall saws are rigidly anchored
to the wall that they are cutting and that by
step cutting, the larger diameter wheels are
always in the cut and supported by the cut
whenever they are experiencing cutting loads.
The combination of both of these substantially
reduces side forces on and deflection of the
wheel, thereby eliminating the requirement of
having large diameter flanges for wheel support
to resist these side forces.
Exception A:
Machines specifically designed and used for
masonry cutting (see section 1.3.12, page 13),
using only reinforced bonded abrasive cuttingoff wheels and steel centered diamond cuttingoff wheels, shall use flanges not less than 4″
diameter for wheels 18″ and 20″ diameter.
Exception B:
Machines specifically designed and used for
concrete sawing (see section 1.3.4, page 12),
using only steel centered diamond abrasive
cutting-off wheels 20″ diameter and larger,
shall use flanges not less than 1/6 the wheel
diameter.
Exception C:
On portable saws using reinforced bonded
abrasive cutting-off wheels up to and including
8 1/4″ diameter, the diameter of the flanges may
be less than one-fourth of the wheel diameter,
providing the flanges are in conformance with
table 15, page 82.
Exception D:
Machines specifically designed and used for
wall sawing (see section 1.3.26, page 16),
using only steel centered diamond abrasive
cutting-off wheels, 20″ diameter and larger,
up to and including 60″ diameter, shall use
flanges of not less than 5″ diameter, providing
a step-cutting procedure is followed during the
sawing operation.
The core thickness minimums given are only
minimum guidelines if the wheel in question is
the largest wheel in use. But, in step cutting, the
smaller diameter diamond abrasive wheels must
cut sufficient clearance for the larger wheels.
For example: if the 48″ wheel has diamond segment of .210″ wide with a core of .180″ thick,
then the 24″ wheel usually has segments of
.250″ wide with a core of .155″, while the 30″
through 42″ wheels have segments of .210″
wide with cores of .155 – .165″ thick.
The step-cutting procedure shall proceed as
follows:
A. Start initial cutting pass with a maximum
24″ diameter wheel.
B. After this initial diamond wheel has cut to
its full depth, subsequent passes are made
with wheels of 6″ incrementally increased
diameters, i.e., 30″, 36″, 42″, etc.
73
ANSI B7.1-2010
C. The steel centered diamond cutting-off
wheel’s core thickness must comply with
the following chart:
Wheel Diameter
Minimum Thickness
24″
.130″
30″
.130″
36″
.135″
42″
.148″
48″
.148″
54″
.148″
60″
.175″
E 5.1.2.1 Type 27A cutting-off wheels
A specific warning shall be provided on all wall
sawing equipment and on all wall saw diamond
wheels stating that the above step-cutting
procedure must be followed whenever flange
diameters in use are less than 1/4 the diameter
of the diamond wheel in use.
5.1.2 Flanges — Types 27, 27A, 28, 29
wheels
5.1.2.1 Type 27A cutting-off wheels
Type 27A cutting-off wheels are designed to be
mounted by means of flat, unrelieved flanges
having matching bearing surfaces and which
may be less than one-third, but shall not be
less than one-fourth the wheel diameter.
5.1.2.2 Types 27, 28 and 29 wheels larger
than 5″ diameter
Type 27, 28 and 29 wheels larger than 5″ require
specially designed adaptors because of their
shape and usage. (See section 1.4.14, page
22 and section 1.4.17, page 23.) The adaptor
(back flange) shall extend beyond the central
hub, or raised portion, and contact the wheel
to counteract the side pressure on the wheel
in use. The adaptor nut, which is less than the
minimum one-third diameter of the wheel, fits
in the depressed side of the wheel to prevent
interference in side grinding. These specially
designed adaptors shall be used to mount only
Types 27, 28 and 29 reinforced organic bonded
wheels. The adapters are exempt from the flange
test specified in section 5.2.1.
74
Illustration 63 – The Type 27A wheel
is mounted between flat unrelieved
flanges of equal bearing surfaces
E 5.1.2.2 Types 27, 28 and 29 wheels larger
than 5″ diameter
Illustration 64 – 7″ and 9″ diameter Types 27
and 28 wheels, because of their shape,
require specially designed adaptors
ANSI B7.1-2010
Mounts which are affixed to the wheel by the
manufacturer may not require an inside nut and
shall not be reused.
5.1.2.3 Type 27 wheels 5″ diameter and
smaller
Type 27 wheels 5″ diameter and smaller with
3/8″ arbor holes shall be mounted with adapters
as described in section 5.1.2.2 (see illustration
64). Type 27 wheels with 5/8″ or 7/8″ diameter
arbor holes shall be mounted with either adapters as described in 5.1.2.2 or matched flanges
(see illustration 65) provided the matched
flanges have outside diameters of at least 1/3
the diameter of the wheel or the outside flange
diameters equal to the K dimension (minus
machining tolerance required).
E 5.1.2.3 Type 27 wheels 5″ diameter and
smaller
Illustration 65 – Mounting condition shown must
have flanges at least one third wheel diameter
E 5.1.3 Flange types
5.1.3 Flange types
There are four general types of flanges (see
illustration 66):
J = Df – 2C (Min.)
A. Straight Relieved. See figure 34, table 14,
page 81; figure 35, table 15, and figure 36,
table 16, page 82.
B. Straight Unrelieved. See figure 37, table 17,
page 83.
C. Adaptor. See figures 38, 39, 41, and 42,
tables 18, 19, and 20, pages 83 to 86.
D. Sleeve Adaptor. See figures 40 and 43,
tables 19 and 21, pages 84 and 86.
Regardless of flange type used, the wheel shall
always be guarded as listed in section 4, page
50. Blotters shall be used as listed in section
5.6, page 78.
T is effective thickness
T=E+F
5.1.3.1 Straight flanges, relieved and unrelieved
The following tables show minimum dimensions
for straight relieved (tables 14, 15, and 16, pages
81 and 82) and unrelieved flanges (table 17,
page 83) for use with wheels with small holes
that fit directly on the machine spindle.
T is effective thickness
T=E+F
Illustration 66 – Four general types of flanges
75
ANSI B7.1-2010
5.1.3.2 Adaptor flanges
E 5.1.3.2 Adaptor flanges
Tables 18, 19, 20, and 21, pages 83 to 86,
show minimum dimensions for adaptor flanges
for use with wheels having holes larger than
the spindle.
Flanges of this type are frequently used with
organic bonded snagging wheels having large
holes.
5.1.3.3 Sleeve adaptor flanges
E 5.1.3.3 Sleeve adaptor flanges
Tables 19 and 21, pages 84 and 86, show
minimum dimensions for flanges that are an
integral part of wheel sleeves.
In mounting large hole wheels, it is most important that equipment and mounting procedures
are satisfactory to avoid distortion of the flanges.
Careful mounting procedures, using new clean
blotters and gradual crisscross tightening of
the mounting screws, are important. Excessive
tightening beyond that necessary to drive the
wheel without slippage results in abnormal
stress near the hole. This must be avoided.
5.2 Design, material and dimensions
E 5.2 Design, material and dimensions
Flanges shall be of such design as to satisfactorily transmit the driving torque from the
spindle to the abrasive wheel.
Flanges must be at least the minimum diameter
specified, identical in diameter and radial bearing surface to avoid cross bending pressures
and stresses in the wheel structure. Flanges
must be of sufficient rigidity to resist “springing”
from mounting pressure. This “springing” can be
detected by inserting a feeler gauge between
bearing area of the flange and the wheel.
Flanges shall be designed with respect to rigidity and flatness so that when tightened, the
radial width of bearing surface of contact on
the wheel shall be maintained.
Note: See section 5.8, page 80, for maintenance
of flanges.
Flanges shall be designed in accordance with
the materials and dimensions shown in tables
14 through 21, pages 81 through 86.
Exception:
If material other than that specified in the listed
tables is used, the resulting flange shall have
strength and rigidity equal to or greater than a
flange made according to the tables; flanges for
bench, pedestal, and portable electric grinders
shall be acceptable when tested in accordance
with section 5.2.1.
5.2.1 Flange test for bench, pedestal and
portable electric grinders
A flat steel plate having a diameter of at least 2″
more than that of the flanges being investigated
is to be mounted as shown in figure 33, page 77,
and loaded in accordance with table 13. Blotters
or other compressible materials are not to be
employed between the steel and the flanges.
A 0.002″ feeler gauge is then to be applied
76
Inorganic wheels with large holes are not recommended for rough snagging operations.
Care must be taken to clean the flanges thoroughly before mounting a wheel. On certain
operations, blotters have a tendency to adhere
to the flange.
ANSI B7.1-2010
between each flange and the steel plate at all
locations on the periphery of each flange. The
flange is acceptable if the feeler gauge cannot
be inserted. (See table 13, page 78.)
E 5.3 Finish and balance
Flanges that are out of balance can increase
the imbalance of the abrasive wheel, spindle,
and flange assembly beyond acceptable limits.
This could create a condition which may cause
unsatisfactory wheel performance or in extreme
cases contribute to wheel breakage.
On precision grinding machines equipped with
balance adjustment devices, wheel/spindle assemblies should be corrected for imbalance by
utilizing such devices.
E 5.4 Uniformity of diameter
Figure 33
If flanges are not of uniform diameter (except
as noted) dangerous cross-bending stresses
in the wheel will be created when flanges are
tightened.
5.3 Finish and balance
Flanges shall be dimensionally accurate and in
balance. They shall be flat and have no rough
surfaces or sharp edges.
5.4 Uniformity of diameter
Both flanges, of any type, between which a
wheel is mounted, shall be of the same diameter and have equal bearing surface.
Exceptions:
A. Types 27, 28 and 29 wheels with adaptors.
B. Modified Types 6 and 11 wheels with tapered K dimension. See section 1.4.22,
page 26.
Illustration 67 – Proper and improper method of
mounting wheels having small holes
C. Internal wheels less than 2″ in diameter.
D. Plain, non-threaded hole, 8″ diameter T-6
cup wheels where the back flange is a flat,
unrelieved flange larger than the relieved
flange in the recess of the cup. Blotters on
the back of the wheel must equal or exceed
the flange diameter.
Illustration 68 – Proper and improper method of
mounting wheels having large holes
77
ANSI B7.1-2010
5.5 Recess and undercut
E 5.5 Recess and undercut
Relieved flanges made according to figures
34 and 35, and tables 14 and 15, pages 81
and 82, shall be recessed (at least as listed)
on the sides of the flanges which are placed
next to the wheel.
The undercut, dimension U in figures 38, 39,
40, 41, 42 and 43, insures there is no binding between the flange and the wheel due
to a chamfer remaining when the flange is
machined.
Flanges of the adaptor or sleeve type (figures
38, 39, 40, 41, 42 and 43, pages 83-86) shall
be undercut so that there will be no bearing
on the sides of the wheel within 1/8″ of the
arbor hole.
Table 13 – Test load for determining flange rigidity for bench, pedestal, and portable electric grinders
Diameter of Spindle
Thread in Inches
Maximum Diameter
of Flange in Inches
Through 1/2
2
Over 1/2 through 3/4
2 11/16
Over 3/4 through 1
3 3/8
Load P
Pounds
720
960
1700
The above values of clamping force are sufficiently high that normal tightening of
spindle nuts will not cause force in excess of values given.
5.6 Blotters
E 5.6 Blotters
A blotter (compressible washer) shall always
be used between each flange and the abrasive
wheel surface to ensure uniform distribution of
flange pressure. Blotters shall cover the entire
flange contact area.
Care must be taken to clean the flanges thoroughly before mounting a wheel, since blotters
will occasionally adhere to the flange.
New blotters shall be used each time a wheel
is mounted unless blotters are affixed to the
wheel by the grinding wheel manufacturer.
Loose blotters shall not be reused when mounting a new wheel or remounting a partly used
wheel. Scuffed or damaged blotters shall not
be used.
Exceptions:
Blotters need not be used with the following
types of wheels:
1.
Mounted wheels.
2. Abrasive disc and Type 2 wheels which
are mounted by means of inserted nuts,
inserted washers, or projecting studs.
3. Plate mounted wheels.
78
Blotters are used for several reasons. They tend
to cushion the pressure of the flanges against
high points or uneven surfaces and distribute
the pressure evenly. They prevent damage to
the surfaces of the flanges from the abrasive
surface of the wheel. They provide a better
coefficient of friction than would be obtained
between the flange and the wheel, thereby
providing better transmission of the driving
power to the wheel.
Blotters are not required on cutting-off operations, however it is permissible to use them
and it is preferred that blotters be used on dry
cutting-off applications.
ANSI B7.1-2010
4. Wheels that are mounted in chucks such
as cylinders and segmental wheels.
5. Types 27, 28 and 29 wheels.
6. Cutting-off, Type 1 and Type 27A wheels.
7.
Internal wheels less than 2″ in diameter.
8. Diamond and cubic boron nitride wheels
with metal or carbon fiber cores.
9. Modified Types 6 and 11 wheels (Terrazzo),
blotters applied to flat side of wheel only.
5.7 Driving flange
E 5.7 Driving flange
The driving flange shall be integral with the
spindle, or shall be mounted on the spindle
in a manner to provide a positive rotational
driving action.
The driving flange must be checked on a regularly maintained schedule for any damage or
runout.
Exception:
On bench grinders with wheels 8″ or less in
diameter and with rated outputs not greater
than 3/4 horsepower, the flange need not be
secured other than by friction.
The bearing surface of the driving flange shall
run true.
5.7.1 Spacers, multiple wheel mounting
E 5.7.1 Spacers, multiple wheel mounting
When more than one wheel is mounted between
a single set of flanges, wheels may be cemented
together or separated by specially designed
spacers. When used, such spacers shall be
equal in diameter to the mounting flanges and
have equal bearing surfaces.
In certain multiple wheel operations where
wheel slippage may be a problem it may be
necessary to key or otherwise securely fasten
both the spacers and the outside flange to the
spindle.
Spacers less than .050″ thick, used between
wheels which are mounted between a single
set of flanges, shall be equal in diameter to the
flanges. They shall be made of low compressibility material such as brass or soft copper.
Blotter material shall not be used in place of
or in conjunction with thin spacers.
Soft compressible blotter material is not generally satisfactory for use as a spacer. Spacers
should be of material rated as low compressibility such as soft copper or brass.
Spacers thicker than .050″ may be steel and
spacers thicker than 3/8″ shall be made of steel.
When steel spacers are used, their diameters
shall equal flange diameters, and the spacers
shall be relieved so that bearing surfaces equal
flange bearing surfaces. Blotters shall be used
between steel spacers and wheels.
Spacers used between flanges and wheels to
reduce the effective spindle length shall be
made of steel. These spacers shall have the
79
ANSI B7.1-2010
same outside and relief diameters as the flanges
and shall be flat and parallel. Blotters shall be
used between spacers and wheels.
A spacer used between a driving flange and
abrasive wheel shall be securely fastened to
the spindle or driving flange to transmit the
driving torque from the spindle. (This section
does not apply to steel-centered diamond
cutting-off wheels used in grooving and grinding applications.)
When mounting wheels which have not been
cemented together, or ones which do not utilize
separate spacers, care must be exercised to
use wheels specifically manufactured for that
purpose. (This section does not apply to steelcentered diamond cutting-off wheels used in
grooving and grinding applications.)
5.8 Repairs and maintenance
E 5.8 Repairs and maintenance
All flange bearing surfaces shall be maintained
in good condition. None of the following conditions shall exist on the mounting surface:
An improperly maintained flange is an unsafe
and ineffective flange. It is unsafe because uneven pressures may cause excessive stress in
the wheel and cause it to brake. It is ineffective
because the flange pressure is not distributed
uniformly over the contact (gripping) area. This
is especially true of wheel sleeves or adapter
flanges.
1.
Warpage
2. Burrs on the bearing surface
3.Excessive wear (thickness or diameter)
4. Out of truth (runout)
If any or all of these conditions exist, the flange
shall be replaced or remachined to correct the
above conditions before reuse.
When refacing or truing flanges, care shall be
exercised to make certain that the minimum
dimensions are maintained.
Flanges that do not conform to tables 14 through
21, pages 81 through 86, shall be replaced.
5.9 Recessed wheels
Flanges used on recessed wheels shall never
interfere with the corner radius of the grinding
wheel recess. For sleeve adaptor type flanges,
the recess should be at least 3/8″ larger than
the flange.
80
ANSI B7.1-2010
J = Df – 2C (Min.)
T
E
Df
C
G
Figure 34 – Driving flange
secured to spindle. See section
5.7, page 79.
NOTE: If there is no taper, then effectively T=E
Table 14 – Minimum dimensions for straight relieved flanges (machined)
D*
Df
Diameter
of Wheel
Minimum
Outside
Diameter of
Flanges (1)
inches
1
2
3
4
5
6
7
8
10
12
14
16
18
20
22
24
26
28
30
36
42
48
60
72
inches
3/8
11/16
1
1 3/8
1 11/16
2
2 3/8
2 11/16
3 3/8
4
4 11/16
5 3/8
6
6 11/16
7 3/8
8
8 11/16
9 3/8
10
12
14
16
20
24
C
Radial Width of Bearing
Surface
Minimum
inches
1/16
1/8
1/8
1/8
3/16
1/4
1/4
1/4
5/16
5/16
3/8
1/2
1/2
5/8
5/8
3/4
3/4
7/8
7/8
1
1
1 1/4
1 1/4
1 1/2
Maximum
inches
1/8
3/16
3/16
3/16
1/4
1/2
1/2
1/2
5/8
5/8
3/4
1
1
1 1/4
1 1/4
1 1/4
1 1/4
1 1/2
1 1/2
2
2
2
2
2 1/2
T
E
G
Minimum
Thickness
of Flange at
Bore
Minimum
Thickness
of Flange
O.D.
(Recess)
inches
1/16
3/32
3/32
1/8
1/8
3/16
3/16
3/16
1/4
5/16
5/16
5/16
3/8
3/8
7/16
7/16
1/2
1/2
5/8
3/4
3/4
1
1 1/8
1 1/4
inches
1/16
3/32
3/32
1/8
1/8
3/16
3/16
3/16
1/4
5/16
5/16
5/16
3/8
3/8
7/16
7/16
1/2
1/2
5/8
3/4
3/4
1
1 1/8
1 1/4
inches
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
1/16
* Flange for wheels under 2″ may be unrelieved and shall be maintained flat and true.
(1)
For exceptions to minimum outside diameter of flanges see section 5.1 and 5.1.1, pages 72 and 73. Flange material: Steel, minimum tensile strength 60,000 psi
The recommendations listed in the above table are guides for the conditions stated. Other material, designs or
dimensions affording equal or superior strength and rigidity are also acceptable.
81
ANSI B7.1-2010
J = Df – 2C (Min.)
T
E
C
G
Df
NOTE: If there is no taper, then effectively T=E
Figure 35 – Driving flange secured to spindle. See section 5.7, page 79.
Table 15 – Minimum dimensions for straight relieved flanges for reinforced
cutting-off wheels 8 1/4 inches in diameter or less used on portable saws
H
Df
C
T
E
G
Major Diameter or Major Dimension*
of Wheel Arbor Hole
Minimum
Outside
Diameter of
Flanges
Radial Width of
Bearing Surface
maximum
Minimum
Thickness
of Flange at
O.D.
Recess
minimum
Minimum
Thickness
of Flange at
Bore
inches
5/8 or smaller
Over 5/8 through 3/4
Over 3/4 through 1 1/4
inches
1 1/8
1 1/4
1 3/4
inches
1/4
1/4
1/4
inches
1/2
1/2
1/2
inches
1/8
1/8
5/32
inches
1/16
3/32
1/8
inches
1/16
1/16
1/16
*Without reduced bushings, see section 6.5, page 90.
The recommendations listed in the above table are guides for the conditions stated. Other material, designs or dimensions
affording equal or superior strength and rigidity are also acceptable.
T
C
T
G
Df
Figure 36 – Stamped or Formed Steel Flanges for Bench Grinders
Table 16 – Minimum dimensions for straight relieved steel flanges stamped
or formed, used on bench grinders 3/4 horsepower or less
D
Diameter of Wheel
inches
4
4 1/2
5
6
7
8
Df
Minimum Outside
Diameter of Flanges
inches
1 3/8
1 1/2
1 11/16
2
2 3/8
2 11/16
C
T
G
Radial Width of
Bearing Surface
Recess
inches
1/32
1/32
1/32
1/32
1/16
1/16
minimum
maximum
Minimum
Thickness
of Flange
inches
1/8
3/16
3/16
1/4
1/4
1/4
inches
3/16
1/4
1/4
1/2
1/2
1/2
inches
0.067
0.067
0.067
0.093
0.123
0.123
Flange material: Steel, minimum tensile strength 60,000 psi
The recommendations listed in the above table are guides for the conditions stated. Other material, designs or
dimensions affording equal or superior strength and rigidity are also acceptable.
82
ANSI B7.1-2010
Table 17 – Minimum dimensions for straight unrelieved
flanges for wheels with threaded inserts
T
Df
D
Df*
T
Diameter of
Wheel
Minimum Outside
Diameter of Flange
Minimum Thickness
of Flange
inches
1
2
3
4
5
6
inches
5/8
1
1
1 3/8
1 3/4
2
inches
1/8
1/8
3/16
3/16
1/4
3/8
NOTE: T is effective thickness.
If there is no taper, then
this is overall thickness
Figure 37 – Driving flange secured to spindle for
use on portable wheels with threaded inserts
Df
T is effective thickness
T=E+F
E
C
F
*NOTE: Must be large enough to extend beyond the bushing.
Where prong anchor or cupback bushings are used, this
footnote does not apply.
The recommendations listed in the above table are guides for the
conditions stated. Other material, designs or dimensions affording
equal or superior strength and rigidity are also acceptable.
U
H
C = Df – (H + 2U)
corner undercut, U = 1/8" min.
Figure 38 – Dr­iving flange secured to spindle.
See section 5.7, page 79.
Table 18 – Minimum dimensions for adaptor flanges for organic bonded
snagging wheels over 1 1/4 inch thick up to and including 9500 SFPM
D
Wheel Diameter
inches
12 through 14
Larger than 14
through 18
Larger than 18
through 24
Larger than 24
through 30
Larger than 30
through 36
(1)
H
Df
T
Wheel Hole
Diameter
Minimum
Flange
Diameter
Minimum
Thickness
of Flange at
Bore
inches
E
F (1)
C
Minimum Thickness
of Flange at Edge
of Undercut
(T-E)
Minimum
Thickness
Minimum
Radial
Bearing
Width
inches
inches
inches
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
inches
inches
3 1/2 or 4
5
6
4
5
6
7
8
6
7
8
10
12
6
7
8
6
7
8
9
10
8
9
10
12
14
1
1
1
1
1
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
1/2
1/2
1/2
1/2
1/2
12
15
1
1/2
1/2
1 1/8
12
15
1 3/8
7/8
1/2
1 1/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
For wheels under 1 1/4″ thick the sum of the F dimensions of the flange assembly shall not exceed 80% of the wheel thickness.
Flange material: Steel, minimum tensile strength of 60,000 psi
The recommendations listed in the above table are guides for the conditions stated. Other material, designs or dimensions
affording equal or superior strength and rigidity are also acceptable.
83
ANSI B7.1-2010
Df
T is effective thickness
T=E+F
T is effective thickness
T=E+F
E
C
F
U
H
C = Df – (H + 2U)
corner undercut, U = 1/8" min.
C = Df – (H + 2U)
corner undercut, U = ⅛" min
Figure 39 – Adaptor Flange - Central Nut Mounting
Figure 40 – Sleeve Adaptor Flange - Multiple Screw
Mounting
Driving flange secured to spindle. See section 5.7,
page 79.
Driving Flange secured to spindle. See section 5.7,
page 79.
Table 19 – Minimum dimensions for flanges for semi-automatic snagging grinders
at speeds over 9500 SFPM up to and including 16,500 SFPM
D
H
Df
T
Wheel
Diameter
Wheel Hole
Diameter
Minimum
Flange
Diameter
Minimum Thickness
of Flange at Bore
inches
inches
inches
inches
(1)
E
F (1)
Minimum Thickness
(T-E)
of Flange at Edge Minimum Thickness
of Undercut
Fixed Flange Only
inches
inches
16
6
8
1
1/2
1/2
20
6
8
1
1/2
1/2
20
8
10
1 1/2
3/4
3/4
20
10
12
1 1/2
3/4
3/4
24
12
15
1 1/2
3/4
3/4
30
12
15
1 1/2
3/4
3/4
36
12
15
1 1/2
3/4
3/4
For wheels under 1 3/4 inches thick the sum of the F dimensions of the flange assembly shall not exceed 80% of the wheel
thickness.
FLANGES shall be of steel, quality SAE 1040 or equivalent, annealed plate, heat treated to Rc 25-30.
The recommendations listed in the above table are guides for the conditions stated. Other material, designs or dimensions
affording equal or superior strength and rigidity are also acceptable.
84
ANSI B7.1-2010
Df
T is effective thickness
T=E+F
E
C
F
U
Figure 41 – Driving flange secured to spindle.
See section 5.7, page 79.
H
C = Df – (H + 2U)
corner undercut, U = 1/8" min.
Table 20 – Minimum dimensions for adaptor flanges for heavy duty organic
bonded snagging wheels used on swing frame grinders and high speed
floorstand and grinders over 9500 SFPM up to, and including, 16,500 SFPM
D
H
Df
T
Wheel
Diameter
Wheel Hole
Diameter
Minimum
Flange
Diameter
Minimum Thickness
of Flange at Bore
inches
inches
inches
inches
inches
inches
20
6
8
1
1/2
1/2
20
8
10
1
1/2
1/2
20
10
12
1
1/2
1/2
24
12
15
1
1/2
1/2
30
12
15
1
1/2
1/2
36
12
15
1
1/2
1/2
(1)
E
F (1)
Minimum Thickness
(T-E)
of Flange at Edge
Minimum Thickness
of Undercut
For wheels under 1 3/4 inches thick the sum of the F dimensions of the flange assembly shall not exceed 80% of the wheel
thickness.
FLANGES shall be of steel, quality SAE 1040 or equivalent, annealed plate, heat treated to Rc 25-30.
The recommendations listed in the above table are guides for the conditions stated. Other material, designs or dimensions
affording equal or superior strength and rigidity are also acceptable.
85
ANSI B7.1-2010
Df
T is effective thickness
T=E+F
T is effective thickness
T=E+F
E
C
F
U
H
C = Df – (H + 2U)
corner undercut, U = 1/8" min.
C = Df – (H + 2U)
corner undercut, U = ⅛" min
Figure 42 – Adaptor flange - Central nut mounting
Figure 43 – Sleeve Adaptor Flange - Multiple Screw
Mounting
Driving flange secured to spindle. See section 5.7,
page 79.
Driving flange secured to spindle. See section 5.7,
page 79.
Table 21 – Minimum dimensions for flanges for precision grinding only
D
H
Df
T
E
C
Wheel Diameter
Wheel Hole
Diameter
Minimum
Outside
Diameter
of Flange
Minimum
Thickness
of Flange at
Bore
Minimum
Thickness
of Flange at
Undercut
Minimum
Radial
Bearing
Width
Inches
3
5
3
5
6
3
5
6
5
6
8
9
10
12
8
10
12
8
10
12
15
16
8
10
12
15
16
12
15
16
18
20
16
20
24
Inches
5
7
5
7
8
5
7
8
7
8
10
11
11 1/2
13 1/2
10
11 1/2
13 1/2
10
11 3/4
13 3/4
16 3/4
17 3/4
10 1/16
12 1/16
14 1/16
17 1/16
18 1/16
14 1/4
17 1/4
18 1/4
20 1/4
22 1/4
20
24
29
Inches
1/2
1/2
1/2
1/2
5/8
1/2
1/2
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
1
1
1 1/8
Inches
7/16
7/16
7/16
7/16
7/16
7/16
7/16
7/16
7/16
7/16
7/16
7/16
7/16
7/16
7/16
7/16
7/16
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
3/4
3/4
7/8
Inches
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
3/8
3/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
3/4
3/4
3/4
3/4
3/4
1 5/8
1 5/8
2 1/8
Inches
8
Larger than 8 through 12
Larger than 12 through 14
Larger than 14 through 18
Larger than 18 through 22
Larger than 22 through 26
Larger than 26 through 30
Larger than 30 through 42
Larger than 42 through 60
NOTE: F
LANGES shall be of steel, quality 1040 or equivalent, annealed plate, heat treated to Rc 25-30.
The recommendations listed in the above table are guides for the conditions stated. Other material, designs
or dimensions affording equal or superior strength and rigidity are also acceptable.
86