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FAFNIR BALLSCREW SUPPORT BEARINGS

Ball Screw Support Series

Superprecision Bearings

FTF

Fundamental Train Frequency: The frequency at which the retainer will operate.

BSF

Ball Spin Frequency: The frequency at which a single defect on a rolling element will be detected.

BPFO

Ball Pass Frequency Outer: The frequency at which a single defect in the outer race will be detected.

BPFI

Ball Pass Frequency Inner: The frequency at which a single defect in the inner race will be detected.

MM9310WI2H

0.4569

3.1286

8.2244

9.7756

0.5431

MM30BS72

0.4569

3.1286

8.2244

9.7756

0.5431

MM35BS72

0.4569

3.1286

8.2244

9.7756

0.5431

MM40BS72

0.4569

3.1286

8.2244

9.7756

0.5431

BSF

BPFO

BPFI

FTF

Ball Spin Frequency

Ball Pass Frequency Outer

Ball Pass Frequency Inner

Fundamental Train Frequency (Outer Rotation)

MM35BS100

0.4564

3.0983

8.2159

9.7841

0.5436

MM40BS100

0.4564

3.0983

8.2159

9.7841

0.5436

MM45BS100

0.4564

3.0983

8.2159

9.7841

0.5436

MM50BS100

0.4564

3.0983

8.2159

9.7841

0.5436

MM9306WI2H

0.4362

2.1044

5.2349

6.7651

0.5638

MM17BS47

0.4362

2.1044

5.2349

6.7651

0.5638

MM20BS47

0.4362

2.1044

5.2349

6.7651

0.5638

MM9313WI5H

0.4676

4.1773

11.2230

12.7770

0.5324

MM40BS90

0.4676

4.1773

11.2230

12.7770

0.5324

MM50BS90

0.4676

4.1773

11.2230

12.7770

0.5324

MM55BS90

0.4676

4.1773

11.2230

12.7770

0.5324

MM55BS120

0.4644

3.7967

9.7516

11.2484

0.5356

MM60BS120

0.4644

3.7967

9.7516

11.2484

0.5356

FREQUENCY COEFFICIENTS

Bearing FTF Number

Fundamental Train Frequency (Inner Rotation)

MM9308WI2H

0.4554

3.0307

MM25BS62

0.4554

3.0307

MM30BS62

0.4554

3.0307

7.7410

9.2590

0.5446

7.7410

9.2590

0.5446

7.7410

9.2590

0.5446

MM9311WI3H

0.4605

3.4145

9.2094

10.7906

0.5395

MM45BS75

0.4605

3.4145

9.2094

10.7906

0.5395

MM9321WI3

0.4794

6.4615

17.7378

19.2622

0.5206

MM100BS150

0.4790

6.4611

17.7226

19.2774

0.5210

MM25BS52

0.4423

2.3307

5.7494

7.2506

0.5577

MM9326WI6H

0.4778

6.1209

16.7239

18.2761

0.5222

MM9316WI3H

0.4747

5.3492

14.2402

15.7598

0.5253

MM75BS110

0.4747

5.3492

14.2402

15.7598

0.5253

102800

91

BALLSCREW SUPPORT BEARINGS

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