×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Expression table and radians mode

Expression table and radians mode

Expression table and radians mode

(OP)
Hello,

I would like to be able to enter the geometric formula which solves for the length of a side of a polygon.

Side = 2(inscribed radius of the polygon)tan(pi/(number of sides of the polygon)

This formula only works when a calculator is set to radians mode. Is there a way to set the expression table to use radians mode instead of degrees in a geometric formula.

I know that I can just put a measurement of one line segment into the table, but as the polygon changes its number of sides, sometimes the line that was measured gets lost and then I lose the measurement.

This is not just converting the units from degrees to radians using rad(). The units in this formula are length on angular. If one sets a scientific calculator to radians mode the formula works in degrees mode, it does not and provides the same value as the NX expression table.

Thank you,

Andy

RE: Expression table and radians mode

Expressions>functions>All>Radians  test string is not exact wording but should get you to the Radians ability. BTW expand the expressions window first.

RE: Expression table and radians mode

When creating an Expression and you set the Dimensionality to 'Angle', under units you will have the option of using either 'degrees' or 'radians'.

John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
http://www.siemens.com/plm
http://www.plmworld.org/museum/

To an Engineer, the glass is twice as big as it needs to be.
 

RE: Expression table and radians mode

(OP)
Thank you for the replies. I have since learned the typing "rtan" vs "tan" causes the formula to work properly.
A UG tech working with us found it deep in the knowledge fusion help.

Setting the dimensionality to angle does not work because there are no angles in the formula as i noted above. The dimensionality has to be a unit of linear measure inches, centimeters etc. A 54 sided polygon with an inscribed radius of 8.125" would be the inputs.

a=(2*8.125")tan(pi/54) for example

thanks again for the answers though.

Andy

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources