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## CLASS DETAILS

- Class Name:
- Trig: Sine Bar Applications 225
- Description:
- This class explains how to use the sine bar for machining and inspection purposes and explains step-by-step examples for using trig ratios and the sine bar to find missing information.
- Version:
- 1.0
- Difficulty:
- Intermediate
- Number of Lessons:
- 14
- Additional Language:
- Spanish, Chinese

## Class Outline

- Objectives
- Sine, Cosine, and Tangent
- What Is the Sine Bar?
- The Purpose of the Sine Bar
- Setting the Sine Bar Angle: An Example
- Determining Gage Block Size
- Determining the Sine Bar Angle
- Determining the Gage Pin Height
- Checking Dimensions: Sample Part
- Sample Inspection: Right Triangle #1
- Sample Inspection: Right Triangle #2
- Sample Inspection: Right Triangle #3
- Sample Inspection: Solution
- Summary

## Objectives

- Identify the three most common trig ratios.
- Describe the sine bar.
- Describe common applications for a sine bar.
- Explain how to set up a sine bar angle.
- Determine the gage block size for a specific sine bar angle.
- Determine the measurement of the sine bar angle using a gage block height.
- Explain how a gage pin helps you measure distances and edges on a part.
- Find the information in the shop print to help you begin measuring a part on a sine bar.
- Use a trig ratio to find missing information in the sample problem.
- Solve for the total part height in the sample problem.

## Job Roles

## Certifications

NIMS- CNC Lathe Operations
- CNC Milling Operations
- Grinding I
- Measurement, Materials, & Safety I
- Milling I

- MSSC Quality Practices and Measurement

## Glossary

Vocabulary Term | Definition |
---|---|

cosine | In a right triangle, the ratio of the length of the side adjacent to the angle divided by the hypotenuse. |

gage block | A hardened steel block that is manufactured with highly accurate dimensions. Gage blocks are available in a set of standardized lengths. |

gage pin | A cylindrical pin often used with the sine bar, which helps determine a range of precise measurements. A gage pin provides an easily accessible surface and a known height from which you can measure all distances and edges. |

height gage | A type of measuring instrument with a precision finished base, a beam that is at a right angle to the base, and an indicator. |

hypotenuse | The longest side of a right triangle. The hypotenuse is always opposite the 90° angle in a right triangle. |

reference angle | The measured, or known angle in a right triangle other than the 90° angle. |

right triangle | A triangle containing one angle that measures exactly 90 degrees. |

sine | In a right triangle, the ratio of the length of the side opposite the angle divided by the hypotenuse. |

sine bar | A steel bar with a matching cylinder on each end that is used for setting up work at various angles for the machining or inspection of parts. A sine bar is ground and lapped to a high accuracy. |

surface plate | A hard, flat surface, usually made of granite, which is used as a base for inspecting parts. |

tangent | In a right triangle, the ratio of the length of the side opposite the angle divided by the adjacent side. |

transversal line | A line that intersects two or more lines at different points. |

trigonometric ratio | A ratio that describes a relationship between a side and angle of a right triangle. |

vertical angles | Two angles that share the same vertex and are positioned directly opposite one another. Vertical angles are formed whenever two lines intersect. |