What are Centerline Tangent Points and Why Are They Important in VTube-LASER?
Reading the T1d, MP, T2d Chart
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The Inspection Data Grid
The chart is represented by a grid of straights for each row, and critical inspection points along each straight:
Technically a tangent point is the point where the straight meets the bend. These are considered the best points for qualifying a tube shape because they most closely approximate a profile gauge. The only exception are the points at the end - where no bend is attached. But these points (T1d in straight 1, and T2d in the last straight) still have value in determining if the part is the correct shape. If the tangent points are within tolerance, then it follows that the shape of the part - based on the straights - fits well enough inside the restricted path or envelope in order to qualify. In GD&T, this is often referred to as the centerline profile. |
How to Understand the Chart
The chart is represented by a grid of straights for each row, and critical inspection points along each straight:
Technically a tangent point is the point where the straight meets the bend. These are considered the best points for qualifying a tube shape because they most closely approximate a profile gauge. The only exception are the points at the end - where no bend is attached. But these points (T1d in straight 1, and T2d in the last straight) still have value in determining if the part is the correct shape. If the tangent points are within tolerance, then it follows that the shape of the part - based on the straights - fits well enough inside the restricted path or envelope in order to qualify. In GD&T, this is often referred to as the centerline profile. |
How to Set the Tolerance
You can set the tolerance in two places in VTube. One place is in the System Options / Measure 2 menu. |
The second place to edit the value is in the VTube-LASER Measure Setup menu's "Other" tab menu. |
Choosing Values
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Set the Default
Set the default value by clearing the VTube project, then changing the value, then saving the setup to the default file in the System Options - Project Setup menu. |
Other Pages
- Back to VTube-LASER