CAD Dimensions Change When Imported to Discovery

- January 27, 2021 at 3:25 pm
  
  seffa
  Subscriber
  
  🛈 This post originally contained file attachments which have been removed in compliance with the updated Ansys Learning Forum Terms & Conditions
  I create my geometry using AutoDesk AutoCAD. I always use English units (feet, inches). I then load this into AutoDesk Mechanical so I can use its export-to-step feature to get my geometry as a STEP files. When I load this into discovery I noticed that the entire drawing gets scalled down by a factor of 2.54. I attached a picture of this. Notice the dimension of 55 feet. Now ill create a STEP file and import that into ANSYS Discovery. I measure the same line and it says its 21.6535 ft. This is a 2.54 factor. This is the first time I caught this issue and now I believe every simulation I have ever run with this program was useless as the geometry was probably wrong. This is very unfortunate as hundreds of hours have probably been wasted. Sam
- January 27, 2021 at 3:27 pm
  
  seffa
  Subscriber
  
  I now realize that 2.54 is the centimeter to inch conversion. So Discovery interprets all inch units as centimeters? How do I correct this without just scaling my geometry up in AutoCAD.
- January 28, 2021 at 4:33 am
  
  Charudatta Bandgar
  Subscriber
  
  Hello seffa
  
  That is rather unfortunate. Will it be possible for you to send me the files so that I can test them and file a bug if it is an issue in Discovery/SpaceClaim.
  
  Regards.
  - January 28, 2021 at 1:46 pm
    
    seffa
    Subscriber
    
    Charudatta Bandgar This is the drawing as it was exported from CAD. The room is 55 ft long and 25 ft long. I will find that ANSYS imports this interpreting the inches as milimeters.
    
    Sam
- January 29, 2021 at 6:08 am
  
  Charudatta Bandgar
  Subscriber
  
  seffa
  
  Can you convert it into some other format and then try to import that file? We can rule out the possibility that it is not an AutoCAD export issue.
  
  Regards.
- January 29, 2021 at 10:03 am
  
  Charudatta Bandgar
  Subscriber
  
  seffa I have filed a bug ticket, 401559. So that the developers can comment on it.
  
  Regards.

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