Difference between revisions of "Model-based Definition"

Revision as of 23:27, 13 August 2015

What is Model-based Definition?

According to Wikipedia: "Model-based definition (MBD), sometimes digital product definition, is the practice of using 3D models (such as solid models, 3D PMI and associated metadata) within 3D CAD software to define (provide specifications for) individual components and product assemblies."

See Wikipedia

VTube-STEP and VTube-LASER

An important feature in all versions of VTube is the ability to import generic solid models of tube shapes in the STEP or IGES formats and then calculate and derive all of the following:

1. Part Number (based on the incoming filename)
   
2. XYZ centerline
   
3. Radius values for every bend
   
4. Diameter
   
5. Wall thickness
   
6. Bender data
   
7. Cut Length
   
   
   

Benefits

The benefits of MBD are significant:

1. ELIMINATES KEYBOARD REENTRY
   Creating bender data from a solid model eliminates keyboard entry of centerline data for the nominal or master part. This is a huge benefit considering many mistakes are made due to misreading or mistyping of numbers from one data grid to the next.
   
   
2. FASTER THAN KEYBOARD ENTRY
   In most cases, importing data from a solid model is much faster than keyboard entry - even if the keyboard entry is perfect the first time.
   
   
3. VISUAL CROSS_CHECK
   Model-based Definition gives instant visual feedback and confirmation that the part is correct - because the derived parametric model is superimposed on top of the imported model on the same screen.
   
   

Compare

In traditional data entry, the coordinate data is manually entered by copying the numerical data from a print or layout in this format: