Contact US

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!

*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

Projection in Trim command

Projection in Trim command

Projection in Trim command

Hi folks,
Got a doubt in trim tool in AutoCAD. What is the option "Projection"inside the trim tool about? Need clarity please.

RE: Projection in Trim command

When timming, you select, first, the line to use as a "tool", and then select all of the other lines that will be trimmed by that too.
When the two lines cross, the trimming that will be done is pretty obvious: The second line it cut short at the intersection with the first line.

But the two lines don't have to cross for this to occur. Changes to the projection allows or prevents AutoCAD from trimming according to the imaginary projection of the cutting line against the line to be cut.

To experiment, draw a horizontal line and a vertical line that intersect.
Trim one line using the other to demonstrate the TRIM function works as you have it set now.
UNDO so that you can have two crossing lines again.
Now move the horizontal line left or right until it no longer overlaps the vertical line.
command TRIM, select the horizontal line, select an end of the vertical line to be trimmed.
If the vertical line is trimmed by the horizontal line, then PROJECTION was used to trim the vertical line by the projection of the horizontal line.
If the vertical line wasn't trimmed, then projection is turned off. Toggle it on and try again.

Don't forget that you can always Google your way into Autodesk's tutorials with searches like "AutoCAD command TRIM".
Those tutorials are illustrated and include all of the settings in each command.


RE: Projection in Trim command

Hi Sparweb,
Thanks a lot for your insights. Let me check it out and get back.

RE: Projection in Trim command

Hi Sparweb,
I checked against your inputs. But found that what you are talking about is the "extend" option in the edge mode.This extend mode works irrespective of the projection option set (none, ucs, view).
Could you please explain with an another example on the exact application of this option 'Project'? Awaiting your reply on this. Thanks a lot.

RE: Projection in Trim command

It has effect, when you are trimming something within 3D space but not in 2D.
Trim -> Project has three options: None, Ucs and View.
When Project is set to None, trimming lines have to cross each other in the space. Otherwise they will be not trimmed.
When Project is set to Ucs, lines will be trimmed by their projection to XY plane.
When Project is set to View, lines will be trimmed by their projection to current view.

Also could be useful information at https://knowledge.autodesk.com/support/autocad/lea...

RE: Projection in Trim command

Hi Maripali,
Thanks a lot for your insights.Now I understand that it is useful only in 3D.Kudos!

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! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close