Why Align Tubes?

Aligning is the action of rotating and moving a MEASURED tube in 3D space in order to place the measured tube as close as possible to the MASTER tube.


The alignments are almost always along the centerline of the tube centerline.


This is, in our opinion, the best way to determine if a measured tube path is qualified and within tolerance of the master path.  It is very visual and easy to verify as being 


Another word commonly used for align is "FIT", therefore we also use the term "BEST FIT" as one of the alignment types.


Alignment Types

An Alignment Type is a unique method for how a measured tube is aligned to the master type.

VTube version 1.77 and higher allows you to choose which Alignment Type to use in order to achieve the best possible alignment of the measured tube to the master tube.

The two example alignments shown here show alignments performed on the same part using two different alignments.

To demonstrate the effect of alignments, the rotation at the handle-end of the cane is twisted in the measured tube shape (the pink tube).

The top alignment is from using BEST FIT alignment type.

The bottom alignment is from using HARD POINT 321 Plane Line Point alignment type.

This microsite describes the alignment types

  • Best Fit is an average alignment comparing all the tangent points in all the straights of both tubes.
  • Hard Point relies on less points for rotational alignment, then shifts the tube to match a single specific point in space.  With Hard Point, there is always one point with zero deviation.
DCC alignment means "Direct Computer Control" alignment - which means the software handles the alignment automatically.  VTube uses DCC alignment by default - i.e., it is automatically calculated based on the current alignment type setup.