Section 5 - Buffalo Abrasives, Inc

72

ANSI B7.1-2000

5 Flanges

5.1 General requirements

All abrasive wheels shall be mounted be-tween flanges which shall not be less thanone-third the diameter of the wheel.

Exceptions:

1. Moun ted whee l s ( sec t i on 1 .4 .19 ,page 25.)

2. Portable cup, cone or plug wheels withthreaded inserts or projecting studs.These wheels shall be mounted againsta s t ra igh t un re l i eved f l ange . (Seetable17, page 83.)

3. Abrasive disc wheels (inserted nut, in-serted washer and projecting stud type).

4. Plate mounted wheels.

5. Cylinder, cup or segmental wheels thatare mounted in chucks.

6. Types 27, 28 and 29 wheels (See sec-tion 5.4, page 77).

7. Internal wheels less than 2" in diameter.

8. Modified Types 6 and 11 wheels (Ter-razzo).

9. Cutting-off wheels, Types 1 and 27A (seesections 5.1.1 and 5.1.2.1, pages 73and 74).

Explanatory Information(NOT PART OF ANSI STANDARD)

E 5.1 General requirements

The major stresses produced in operatingabrasive wheel tend to combine and becomegreatest at the hole. It is, therefore, impor-tant that stresses due to mounting and driv-ing act as far from the holes as practicable.

This is best accomplished by using flangesat least as large as those listed in tables 14through 21, pages 81 through 86.

Flanges should be at least the minimumdiameters specified, identical in diameter andradial bearing surface to avoid cross bend-ing pressures and stresses in the wheel struc-ture. In many cutting-off operations, betterresults may be obtained by using flangeslarger than the minimum requirement.

Blotters (compressible washers) should al-ways be used between metal flanges andabrasive wheel surfaces for uniform distribu-tion of flange pressure.

See section 5.6, page 78, for exceptionsregarding the use of blotters.

Flanges must be checked periodically forflatness, burrs and wear.

Illustration 62 – Note the flanges used here areat least 1/3 the wheel diameter, finished all

over, and free of rough or sharp edges

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ANSI B7.1-2000

5.1.1 Type 1 cutting-off wheels

Type 1 cutting-off wheels shall be mountedbetween properly relieved flanges which havematching bearing surfaces. Such flangesshall be at least one-fourth the wheel diam-eter. See table 14, page 81, column C, forproper bearing surface.

Exception A:Machines specifically designed and used formason ry cu t t i ng ( see sec t i on 1 .3 .12 ,page 13), using only reinforced bonded abra-sive cutting-off wheels and steel centereddiamond cutting-off wheels, shall use flangesnot less than 4" diameter for wheels 18" and20" diameter.

Exception B:Machines specifically designed and used forconcrete sawing (see section 1.3.4, page12),using only steel centered diamond abrasivecutting-off wheels 20" diameter and larger,shall use flanges not less than 1/6 the wheeldiameter.

Exception C:On portable saws using reinforced bondedabrasive cutting-off wheels up to and includ-ing 81/4" diameter, the diameter of the flangesmay be less than one-fourth of the wheeldiameter, providing the flanges are in con-formance with table 15, page 82.

Exception D:Machines specifically designed and used forwall sawing (see section 1.3.26, page 16),using only steel centered diamond abrasivecutting-off wheels, 20" diameter and larger,up to and including 60" diameter, shall useflanges of not less than 5" diameter, provid-ing a step-cutting procedure is followed dur-ing the sawing operation.

The step-cutting procedure shall proceed asfollows:

A. Start initial cutting pass with a maximum24" diameter wheel.

B. After this initial diamond wheel has cut toits full depth, subsequent passes aremade with wheels of 6" incrementallyincreased diameters, i.e., 30", 36", 42",etc.

E 5.1.1 Type 1 cutting-off wheels

Exceptions to the standard requiring thatflanges be 1/4 of the wheel diameter havebeen made for steel-centered diamond abra-sive cutting-off wheels. This is because thesesteel-centered wheels are not only stronger,but also more ductile than bonded abrasivewheels. Exception A allows for flanges to be1/5 the diameter of the wheel, while excep-tion B allows flanges to be 1/6 the diameter.Exception D for wall saws allows flangessmaller than 1/6 the diameter for wheelslarger than 30", but only when proper stepcutting procedures are used. The reason forthis is that wall saws are rigidly anchored tothe wall that they are cutting and that by stepcutting, the larger diameter wheels are al-ways in the cut and supported by the cutwhenever they are experiencing cutt ingloads. The combination of both of these sub-stantially reduces side forces on and deflec-tion of the wheel, thereby eliminating therequirement of having large diameter flangesfor wheel support to resist these side forces.

The core thickness minimums given are onlyminimum guidelines if the wheel in questionis the largest wheel in use. But, in stepcutting, the smaller diameter diamond abra-sive wheels must cut sufficient clearance forthe larger wheels. For example: if the 48"wheel has diamond segment of .210" widewith a core of .180" thick, then the 24" wheelusually has segments of .250" wide with acore of .155", while the 30" through 42"wheels have segments of .210" wide withcores of .155 - .165" thick.

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ANSI B7.1-2000

C. The steel centered diamond cutting-offwheel ’s core thickness must comply withthe following chart:

Wheel Diameter Minimum Thickness

24" .130"30" .130"36" .135"42" .148"48" .148"54" .148"60" .175"

A specific warning shall be provided on allwall sawing equipment and on all wall sawdiamond wheels stating that the above step-cutting procedure must be followed when-ever 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, 29wheels

5.1.2.1 Type 27A cutting-off wheels

Type 27A cutting-off wheels are designed tobe mounted by means of flat, unrelievedflanges having matching bearing surfacesand which may be less than one-third, butshall not be less than one-fourth the wheeldiameter.

5.1.2.2 Types 27, 28 and 29 wheels largerthan 5" diameter

Type 27, 28 and 29 wheels larger than 5"require specially designed adaptors becauseof their shape and usage. (See section1.4.14, page 22 and section 1.4.17, page 23.)The adaptor (back flange) shall extend be-yond the central hub, or raised portion, andcontact the wheel to counteract the sidepressure on the wheel in use. The adaptornut, which is less than the minimum one-third diameter of the wheel, fits in the de-pressed side of the wheel to prevent inter-ference in side grinding. These specially de-signed adaptors shall be used to mount onlyTypes 27, 28 and 29 reinforced organicbonded wheels. The adapters are exemptfrom the flange test specified in section 5.2.1.

E 5.1.2.1 Type 27A cutting-off wheels

Illustration 63 – The Type 27A wheelis mounted between flat unrelievedflanges of equal bearing surfaces

E 5.1.2.2 Types 27, 28 and 29 wheelslarger than 5" diameter

Illustration 64 – 7" and 9" diameter Types 27and 28 wheels, because of their shape,

require specially designed adaptors

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ANSI B7.1-2000

Mounts which are affixed to the wheel by themanufacturer may not require an inside nutand shall not be reused.

5.1.2.3 Type 27 wheels 5" diameter andsmaller

Type 27 wheels 5" diameter and smaller with3/8" arbor holes shall be mounted with adapt-ers as described in section 5.1.2.2 (see il-lustration 64). Type 27 wheels with 5/8" or 7/8"diameter arbor holes shall be mounted witheither adapters as described in 5.1.2.2 ormatched flanges (see illustration 65) pro-vided the matched flanges have outside di-ameters of at least 1/3 the diameter of thewheel or the outside flange diameters equalto the K dimension (minus machining toler-ance required) shown in annex C, table C-3for the size wheel in question.

5.1.3 Flange types

There are four general types of flanges (seeillustration 66):

A. Straight Relieved. See figure 34, table 14,page 81; figure 35, table 15, and figure36, table 16, page 82.

B. St ra ight Unre l ieved. See f igure 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 wheelshall always be guarded as listed in sec-tion 4, page 50. Blotters shall be used aslisted in section 5.6, page 78.

5.1.3.1 Straight flanges, relieved and un-relieved

The following tables show minimum dimen-sions for straight relieved (tables 14, 15, and

E 5.1.2.3 Type 27 wheels 5" diameter andsmaller

Illustration 65 – Mounting conditionshown must have flanges at least

one third wheel diameter

E 5.1.3 Flange types

A. Straight relieved

C. Adaptor

D. Sleeve adaptor

Df

CU

FET is effective thicknessT=E+F

H

B. Straight unrelieved

T

Df

Df

CUF

ET is effective thicknessT=E+F

H

ET

CGDf

J = Df – 2C (Min.)

Illustration 66 – Four general types of flanges

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ANSI B7.1-2000

16, pages 81 and 82) and unrelieved flanges(table 17, page 83) for use with wheels withsmall holes that fit directly on the machinespindle.

5.1.3.2 Adaptor flanges

Tables 18, 19, 20, and 21, pages 83 to 86,show min imum dimensions for adaptorflanges for use with wheels having holeslarger than the spindle.

5.1.3.3 Sleeve adaptor flanges

Tables 19 and 21, pages 84 and 86, showminimum dimensions for flanges that are anintegral part of wheel sleeves.

5.2 Design, material and dimensions

Flanges shall be of such design as to satis-factorily transmit the driving torque from thespindle to the abrasive wheel.

Flanges shall be designed with respect torigidity and flatness so that when tightened,the radial width of bearing surface of contacton the wheel shall be maintained.

Note: See section 5.8, page 80, for mainte-nance of flanges.

Flanges shall be designed in accordancewith the materials and dimensions shown intables 14 through 21, pages 81 through 86.

Exception:

If material other than that specified in thelisted tables is used, the resulting flangeshall have strength and rigidity equal to orgreater than a flange made according to thetables; flanges for bench, pedestal, and por-table electric grinders shall be acceptablewhen tested in accordance with section 5.2.1.

5.2.1 Flange test for bench, pedestal andportable electric grinders

A flat steel plate having a diameter of atleast 2" more than that of the flanges beinginvestigated is to be mounted as shown in

E 5.1.3.2 Adaptor flanges

Flanges of this type are frequently used withorganic bonded snagging wheels having largeholes.

Inorganic wheels with large holes are notrecommended for rough snagging operations.

E 5.1.3.3 Sleeve adaptor flanges

In mounting large hole wheels, it is mostimportant that equipment and mounting pro-cedures are satisfactory to avoid distortionof the flanges. Careful mounting procedures,using new clean blotters and gradual criss-cross tightening of the mounting screws, areimportant. Excessive tightening beyond thatnecessary to drive the wheel without slip-page results in abnormal stress near thehole. This must be avoided.

E 5.2 Design, material and dimensions

Flanges must be at least the minimum diam-eter specified, identical in diameter and ra-dial bearing surface to avoid cross bendingpressures and stresses in the wheel struc-ture. Flanges must be of sufficient rigidity toresist “springing” from mounting pressure.This “springing” can be detected by insertinga feeler gauge between bearing area of theflange and the wheel.

Care must be taken to clean the flangesthoroughly before mounting a wheel. On cer-tain operations, blotters have a tendency toadhere to the flange.

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ANSI B7.1-2000

figure33, page 77, and loaded in accor-dance with table 13. Blotters or other com-pressible materials are not to be employedbetween the steel and the flanges. A 0.002"feeler gauge is then to be applied betweeneach flange and the steel plate at all loca-tions on the periphery of each flange. Theflange is acceptable if the feeler gauge can-not be inserted. (See table 13, page 78.)

Figure 33

5.3 Finish and balance

Flanges shall be dimensionally accurate andin balance. They shall be flat and have norough surfaces or sharp edges.

5.4 Uniformity of diameter

Both flanges, of any type, between which awheel is mounted, shall be of the same di-ameter and have equal bearing surface.

Exceptions:

A. Types 27, 28 and 29 wheels with adap-tors.

B. Modified Types 6 and 11 wheels withtapered K dimension. See section 1.4.22,page 26.

C. Internal wheels less than 2" in diameter.

E 5.3 Finish and balance

Flanges that are out of balance can increasethe imbalance of the abrasive wheel, spindle,and flange assembly beyond acceptable lim-its. This could create a condition which maycause unsatisfactory wheel performance or inextreme cases contribute to wheel breakage.

On precision grinding machines equippedwith balance adjustment devices, wheel/spindle assemblies should be corrected forimbalance by utilizing such devices.

E 5.4 Uniformity of diameter

If flanges are not of uniform diameter (ex-cept as noted) dangerous cross-bendingstresses in the wheel will be created whenflanges are tightened.

Illustration 67 – Proper and improper methodof mounting wheels having small holes

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ANSI B7.1-2000

5.5 Recess and undercut

Relieved flanges made according to figures34 and 35, and tables 14 and 15, pages 81and 82, shall be recessed (at least as listed)on the sides of the flanges which are placednext to the wheel.

Flanges of the adaptor or sleeve type (fig-ures 38, 39, 40, 41, 42 and 43, pages 83-86)shall be undercut so that there will be nobearing on the sides of the wheel within 1/8"of the arbor hole.

5.6 Blotters

A blotter (compressible washer) shall alwaysbe used between each flange and the abra-sive wheel surface to ensure uniform distri-bution of flange pressure. Blotters shall coverthe entire flange contact area.

New blotters shall be used each time a wheelis mounted unless blotters are affixed to thewheel by the grinding wheel manufacturer.Loose blotters shall not be reused whenmounting a new wheel or remounting a partly

Table 13 – Test load for determining flange rigidity for bench, pedestal,and portable electric grinders

Diameter of Spindle Maximum Diameter of Load PThread in Inches Flange in Inches Pounds

Thru 1/2 2 720 Over 1/2 thru 3/4 2 11/16 960 Over 3/4 thru 1 3 3/8 1700The above values of clamping force are sufficiently high that normal tightening of spindle nuts will not cause force in excess of values given.

Illustration 68 – Proper and improper methodof mounting wheels having large holes

E 5.6 Blotters

Care must be taken to clean the flangesthoroughly before mounting a wheel, sinceblotters will occasionally adhere to the flange.

Blotters are used for several reasons. Theytend to cushion the pressure of the flangesagainst high points or uneven surfaces anddistribute the pressure evenly. They preventdamage to the surfaces of the flanges fromthe abrasive surface of the wheel. They pro-vide a better coefficient of friction than would

E 5.5 Recess and undercut

The undercut, dimension U in figures 38, 39,40, 41, 42 and 43, insures there is no bind-ing between the flange and the wheel due toa chamfer remaining when the flange is ma-chined.

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ANSI B7.1-2000

used wheel. Scuffed or damaged blottersshall not be used.

Exceptions:

Blotters need not be used with the followingtypes of wheels:

1. Mounted wheels.

2. Abrasive disc and Type 2 wheels whichare mounted by means of inserted nuts,inserted washers, or projecting studs.

3. Plate mounted wheels.

4. Wheels that are mounted in chucks suchas 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 wheelswith metal or carbon fiber cores.

9. Modified Types 6 and 11 wheels (Ter-razzo), blotters applied to flat side ofwheel only.

5.7 Driving flange

The driving flange shall be integral with thespindle, or shall be mounted on the spindlein a manner to provide a positive rotationaldriving action.

Exception:

On bench grinders with wheels 8" or less indiameter and with rated outputs not greaterthan 3/4 horsepower, the flange need not besecured other than by friction.

The bearing surface of the driving flangeshall run true.

5.7.1 Spacers, multiple wheel mounting

When more than one wheel is mounted be-tween a single set of flanges, wheels may becemented together or separated by speciallydesigned spacers. When used, such spacersshall be equal in diameter to the mountingflanges and have equal bearing surfaces.

Spacers less than .050" thick, used betweenwheels which are mounted between a singleset of flanges, shall be equal in diameter tothe flanges. They shall be made of low com-pressibility material such as brass or softcopper. Blotter material shall not be used inplace of or in conjunction with thin spacers.

be obtained between the flange and thewheel, thereby providing better transmissionof the driving power to the wheel.

Blotters are not required on cutting-off op-erations, however it is permissible to usethem and it is preferred that blotters be usedon dry cutting-off applications.

E 5.7 Driving flange

The driving flange must be checked on aregularly maintained schedule for any dam-age or runout.

E 5.7.1 Spacers, multiple wheel mounting

In certain multiple wheel operations wherewheel slippage may be a problem it may benecessary to key or otherwise securely fas-ten both the spacers and the outside flangeto the spindle.

Soft compressible blotter material is not gen-erally satisfactory for use as a spacer. Spac-ers should be of material rated as low com-pressibility such as soft copper or brass.

80

ANSI B7.1-2000

Spacers thicker than .050" may be steel andspacers thicker than 3/8" shall be made ofsteel. When steel spacers are used, theirdiameters shall equal flange diameters, andthe spacers shall be relieved so that bearingsurfaces equal flange bearing surfaces. Blot-ters shall be used between steel spacersand wheels.

Spacers used between flanges and wheelsto reduce the effective spindle length shallbe made of steel. These spacers shall havethe same outside and relief diameters as theflanges and shall be flat and parallel. Blot-ters shall be used between spacers andwheels.

A spacer used between a driving flange andabrasive wheel shall be securely fastened tothe spindle or driving flange to transmit thedriving torque from the spindle. (This sectiondoes not apply to steel-centered diamondcutting-off wheels used in grooving and grind-ing applications.)

When mounting wheels which have not beencemented together, or ones which do notutilize separate spacers, care must be exer-cised to use wheels specifically manufac-tured for that purpose. (This section doesnot apply to steel-centered diamond cutting-off wheels used in grooving and grindingapplications.)

5.8 Repairs and maintenance

All flange bearing surfaces shall be main-tained in good condition. None of the follow-ing conditions shall exist on the mountingsurface:

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, theflange shall be replaced or remachined tocorrect the above conditions before reuse.

When refacing or truing flanges, care shallbe exercised to make certain that the mini-mum dimensions are maintained.

Flanges that do not conform to tables 14through 21, pages 81 through 86, shall bereplaced.

E 5.8 Repairs and maintenance

An improperly maintained flange is an un-safe and ineffective flange. It is unsafe be-cause uneven pressures may cause exces-sive stress in the wheel and cause it tobrake. It is ineffective because the flangepressure is not distributed uniformly over thecontact (gripping) area. This is especiallytrue of wheel sleeves or adapter flanges.

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ANSI B7.1-2000

Table 14 – Minimum dimensions for straight relieved flanges (machined)

5.9 Recessed wheels

Flanges used on recessed wheels shall neverinterfere with the corner radius of the grind-ing wheel recess. For sleeve adaptor typeflanges, the recess should be at least 3/8"larger than the flange.

Figure 34 – Driving flangesecured to spindle. See

section 5.7, page 79.

ET

CGDf

J = Df – 2C (Min.)

NOTE: If there is no taper, then effectively T=E

D* Df T E G

Minimum Maximuminches inches inches inches inches inches inches

1 3/8 1/16 1/8 1/16 1/16 1/162 11/16 1/8 3/16 3/32 3/32 1/163 1 3/16 3/16 3/32 3/32 1/164 1 3/8 3/16 3/16 1/8 1/8 1/165 1 11/16 1/4 1/4 1/8 1/8 1/166 2 3/8 1/2 3/16 3/16 1/167 2 3/8 3/8 1/2 3/16 3/16 1/168 2 11/16 3/8 1/2 3/16 3/16 1/16

10 3 3/8 3/8 5/8 1/4 1/4 1/1612 4 1/2 5/8 5/16 5/16 1/1614 4 11/16 1/2 3/4 5/16 5/16 1/1616 5 3/8 1/2 1 5/16 5/16 1/1618 6 5/8 1 3/8 3/8 1/1620 6 11/16 5/8 1 1/4 3/8 3/8 1/1622 7 3/8 5/8 1 1/4 7/16 7/16 1/1624 8 5/8 1 1/4 7/16 7/16 1/1626 8 11/16 5/8 1 1/4 1/2 1/2 1/1628 9 3/8 3/4 1 1/2 1/2 1/2 1/1630 10 3/4 1 1/2 5/8 5/8 1/1636 12 7/8 2 3/4 3/4 1/1642 14 7/8 2 3/4 3/4 1/1648 16 1 1/8 2 1 1 1/1660 20 1 1/4 2 1 1/8 1 1/8 1/1672 24 1 3/8 2 1/2 1 1/4 1 1/4 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

C

Diameter of Wheel

Minimum Outside

Diameter of Flanges (1)

Radial Width of Bearing Surface

Minimum Thickness of

Flange at Bore

Minimum Thickness of Flange O.D.

(Recess)

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.

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ANSI B7.1-2000

Table 15 – Minimum dimensions for straight relieved flanges for reinforced cutting-off wheels 81/4 inches in diameter or less used on portable saws

Table 16 – Minimum dimensions for straight relieved steel flanges stampedor formed, used on bench grinders 3/4 horsepower or less

Figure 35 – Driving flange secured to spindle. See section 5.7, page 79.

Figure 36 – Stamped or Formed Steel Flanges for Bench Grinders

ET

CGDf

J = Df – 2C (Min.)

NOTE: If there is no taper, then effectively T=E

T

GC

Df

T

H Df T E GMajor Diameter Minimum Minimum Minimum

or Major Dimension* Outside Thickness Thickness of Recessof Wheel Diameter of of Flange Flange at

Arbor Hole Flanges minimum maximum at Bore O.D.inches inches inches inches inches inches inches

5/8 or smaller 1 1/8 1/4 1/2 1/8 1/16 1/16Over 5/8 through 3/4 1 1/4 1/4 1/2 1/8 3/32 1/16Over 3/4 through 1 1/4 1 3/4 1/4 1/2 5/32 1/8 1/16*Without reduced bushings, see section 6.5, page 90.


C


D Df T GMinimum Outside Minimum

Diameter Diameter of Thickness Recessof Wheel Flanges of Flange

minimum maximuminches inches inches inches inches inches4 1 3/8 1/8 3/16 0.067 1/324 1/2 1 1/2 3/16 1/4 0.067 1/325 1 11/16 3/16 1/4 0.067 1/326 2 1/4 1/2 0.093 1/327 2 3/8 1/4 1/2 0.123 1/168 2 11/16 1/4 1/2 0.123 1/16

Flange material: Steel, minimum tensile strength 60,000 psiThe 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.


C

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ANSI B7.1-2000

Table 17 – Minimum dimensions for straightunrelieved flanges for wheels with threaded inserts

Table 18 – Minimum dimensions for adaptor flanges for organic bondedsnagging wheels over 11/4 inch thick up to and including 9500 SFPM

T

Df

NOTE: T is effective thickness.If there is no taper, thenthis is overall thickness

Figure 37 – Driving flange secured tospindle for use on portable wheels with

threaded inserts

Figure 38 – Driving flangesecured to spindle. See

section 5.7, page 79.

Df

CUF


HC = Df – (H + 2U)corner undercut, U = 1/8" min.

D Df* TDiameter of

WheelMinimum Outside

Diameter of FlangeMinimum Thickness

of Flangeinches inches inches

1 5/8 1/82 1 1/83 1 3/164 1 3/8 3/165 1 3/4 1/46 2 3/8

*NOTE: Must be large enough to extend beyond the bushing. Where prong anchor or cupback bushings are used, this footnote does not apply.


D H Df T E F (1) C

Wheel Diameter Wheel Hole Diameter

Minimum Flange

Diameter


Flange at Bore

MinimumThickness of

Flange at Edge of Undercut

(T-E) Minimum

Thickness

Minimum Radial

Bearing Width

inches inches inches inches inches inches inches3 1/2 or 4 6 7/8 3/8 1/2 5/8

12 through 14 5 7 7/8 3/8 1/2 5/86 8 7/8 3/8 1/2 5/84 6 7/8 3/8 1/2 5/85 7 7/8 3/8 1/2 5/86 8 7/8 3/8 1/2 5/87 9 7/8 3/8 1/2 5/88 10 7/8 3/8 1/2 5/86 8 1 1/2 1/2 5/87 9 1 1/2 1/2 5/88 10 1 1/2 1/2 5/8

10 12 1 1/2 1/2 5/812 14 1 1/2 1/2 5/8

Larger than 24 through 30 12 15 1 1/2 1/2 1 1/8

Larger than 30 through 36 12 15 1 3/8 7/8 1/2 1 1/8

(1) For wheels under 1 1/4 inch 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


Larger than 14 through 18


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ANSI B7.1-2000

Figure 39 – Adaptor Flange - Central NutMounting

Driving flange secured to spindle. See section 5.7,page 79.

Figure 40 – Sleeve Adaptor Flange - MultipleScrew Mounting

Driving Flange secured to spindle. See sec-tion 5.7, page 79.

Table 19 – Minimum dimensions for flanges for semi-automatic snagging grindersat speeds over 9500 SFPM up to and including 16,500 SFPM

Df

CUF



Df

CU



D H Df T E F (1)

Wheel Diameter

Wheel Hole Diameter

Minimum Flange

Diameter


Flange at Bore

MinimumThickness of


(T-E) Minimum Thickness Fixed Flange Only

inches inches inches inches inches inches16 6 8 1 1/2 1/220 6 8 1 1/2 1/220 8 10 1 1/2 3/4 3/420 10 12 1 1/2 3/4 3/424 12 15 1 1/2 3/4 3/430 12 15 1 1/2 3/4 3/436 12 15 1 1/2 3/4 3/4

(1) 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.


85

ANSI B7.1-2000

Table 20 – Minimum dimensions for adaptor flanges for heavy duty organicbonded snagging wheels used on swing frame grinders and high speed

floorstand and grinders over 9500 SFPM up to, and including, 16,500 SFPM

Figure 41 – Driving flangesecured to spindle.

See section 5.7, page 79.

Df

CUF



D H Df T E F (1)

Wheel Diameter

Wheel Hole Diameter

Minimum Flange

Diameter


Flange at Bore

MinimumThickness of


(T-E) Minimum Thickness

inches inches inches inches inches inches20 6 8 1 1/2 1/220 8 10 1 1/2 1/220 10 12 1 1/2 1/224 12 15 1 1/2 1/230 12 15 1 1/2 1/236 12 15 1 1/2 1/2

(1) 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.


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ANSI B7.1-2000

Table 21 – Minimum dimensions for flanges for precision grinding only

Figure 42 – Adaptor flange - Central nutmounting

Driving flange secured to spindle. See section 5.7, page 79.

Figure 43 – Sleeve Adaptor Flange - MultipleScrew Mounting

Driving flange secured to spindle. See section 5.7, page 79.

Df

CUF



Df

CU



D H Df T E C

Wheel Diameter Wheel Hole Diameter

Minimum Outside

Diameter of Flange


Flange at Bore


Flange at Undercut

Minimum Radial Bearing

Width

Inches Inches Inches Inches Inches Inches3 5 1/2 7/16 5/85 7 1/2 7/16 5/83 5 1/2 7/16 5/8

Larger than 8 through 12 5 7 1/2 7/16 5/86 8 5/8 7/16 5/83 5 1/2 7/16 5/8

Larger than 12 through 14 5 7 1/2 7/16 5/86 8 5/8 7/16 5/85 7 5/8 7/16 5/86 8 5/8 7/16 5/88 10 5/8 7/16 5/89 11 5/8 7/16 5/810 11 1/2 5/8 7/16 3/812 13 1/2 5/8 7/16 3/88 10 5/8 7/16 5/8

Larger than 18 through 22 10 11 1/2 5/8 7/16 5/812 13 1/2 5/8 7/16 5/88 10 3/4 1/2 5/810 11 3/4 3/4 1/2 5/8

Larger than 22 through 26 12 13 3/4 3/4 1/2 5/815 16 3/4 3/4 1/2 5/816 17 3/4 3/4 1/2 5/88 10 3/4 1/2 5/810 12 3/4 1/2 5/8

Larger than 26 through 30 12 14 3/4 1/2 5/815 17 3/4 1/2 5/816 18 3/4 1/2 5/812 14 1/4 3/4 1/2 3/415 17 1/4 3/4 1/2 3/4

Larger than 30 through 42 16 18 1/4 3/4 1/2 3/418 20 1/4 3/4 1/2 3/420 22 1/4 3/4 1/2 3/416 20 1 3/4 1 5/8

Larger than 42 through 60 20 24 1 3/4 1 5/824 29 1 1/8 7/8 2 1/8

NOTE: FLANGES shall be of steel, quality 1040 or equivalent, annealed plate, heat treated to Rc 25-30.

For hole sizes smaller than shown in this table, use table 14.

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Section 5 - Buffalo Abrasives, Inc

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