What is the definition of "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.

Learn more about sine bar in the class Trig: Sine Bar Applications 225 below.


Shop Essentials Training


Class Information
Tooling U-SME classes are offered at the beginner, intermediate, and advanced levels. The typical class consists of 12 to 25 lessons and will take approximately one hour to complete.
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.
Prerequisites: 800215
Difficulty:Intermediate
Number of Lessons:14
Language:English, Spanish, Chinese
 
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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
  
Class 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.

Class Vocabulary

Vocabulary TermDefinition
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.