Sine Bar

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5-inch Sine Bar

The primary use of a Sine Bar is to position the part being machined at a precision angle. Setting up a part at a precise angle can be crucial when using a mill or a grinder. The Sine Bar is used in conjunction with gage blocks. Gage blocks are metal blocks that are ground to extremely precise thicknesses. They are made out of a hardened metal material with a high quality finish that resists, scratching, denting, and corrosion.


Three-step Process
Step Description
Step One: Tool Location
  1. Sine Bar located in Cabinet 5.
  2. Gage Blocks are located a drawer down in the same cabinet.
Step Two: Form Triange, REF.[1]
Forming Triangle
  1. Calculate and determine which gage blocks are going to be used in the procedure.
  2. Shop sine bar is 5 inches from cylinder to cylinder.
  3. The height component may be calculated using h = 5*Sin(ϴ).
  4. Always orient the sine bar such that the round surface in the lower left hand cylinder is resting on a flat surface and the opposing cylinder is sitting atop the gage blocks.
Step Three: Mill Setup,
Mill Setup
  1. Place block setup in Mill at desired angle.
  2. Use bar as a parallel.
  3. The grips shown in the photo are used to secure larger parts and are found atop the red cabinet next to the HAAS CNC Mill. These grips may be swapped out using an allen wrench.

Common Angles

Angle of block v. height needed*
Angle (deg) height (in)
5 0.4358
10 0.8682
15 1.2941
20 1.7101
25 2.1131
30 2.5000
35 2.8679
40 3.2139
45 3.5355
50 3.8302
55 4.0958
60 4.3301

*heights are given for a 5-inch sine bar