Inch Sine Bar Gage On The Timken Company

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Tapered-bore, antifriction bearings are mounted either on adapter sleeves or on tapered shaft seats.
In cases where tapered bore bearings are mounted directly on the shaft, the shaft must conform to the tapered bore of the bearing to assure proper fit. If a proper fit is not achieved, the results could be:
- Turning of the bearing inner race on the shaft.
- Uneven loading of the bearing.
- Severe inner race hoop stress.
- Insufficient support (back-up) of the inner race on the shaft.
All of these conditions could lead to premature bearing damage. Therefore, the manufacture, maintenance and measurement of accurate shaft tapers is important.
There are two accepted ways of measuring tapered shafts: ring gages and sine bar gages.
Precision measurement of tapered shafts is difficult with ring gages and may be impossible in the case of large shafts where gages are large, cumbersome and heavy.
Sine bar gages provide an accurate and easy method of measurement.
Lightweight and easy to handle and learn, sine bar gages achieve precise gagging of the shaft size and taper.
A complete set for measurement of 1:12 shaft tapers consists of 3 in, 4 in, 5 1/2 in, 7 in, 10 in and 14 in sine bar gages, sine bar saddle no. T-5491-C, web clamp no. T-5489-A and a wooden box no. T-5224-C. A complete set for 1:30 shaft tapers consists of 4 in, 6 in, 8 in and 12 in sine bar gages.
Sine bars can be purchased individually, or in any combination of sizes to meet your individual needs.
All sine bars require a sine bar saddle and web clamp. A wooden box is optional.
For information on the use of sine bars, prices and delivery, consult your Timken representative.

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