Sketch trim and extend in Solidworks - Step-by-Step Guide

Introduction

Sketch trim and extend tools help you clean up and adjust sketch lines quickly. They let you remove extra parts or lengthen lines to meet other sketch elements, making your sketches neat and ready for 3D modeling.

When you want to remove overlapping or extra sketch lines that are not needed.

When you need to shorten a line so it stops exactly at another line or curve.

When you want to lengthen a line to meet another sketch element without redrawing.

When cleaning up complex sketches to prepare for features like extrude or cut.

When adjusting sketches to fix small gaps or overlaps before creating 3D shapes.

Steps

Step 1: Click

- Sketch tab > Trim Entities tool

The cursor changes to a trim icon, ready to trim sketch lines

💡 Hover over lines to see which parts will be trimmed before clicking

Step 2: Click

- Sketch line segment to trim

The selected part of the line is removed up to the nearest intersecting sketch element

💡 If multiple trim options appear, choose the correct one by clicking carefully

Step 3: Click

- Sketch tab > Extend Entities tool

The cursor changes to an extend icon, ready to lengthen sketch lines

💡 Use this when you want to lengthen a line to meet another line or curve

Step 4: Click

- Sketch line segment to extend

The line extends to meet the nearest sketch element

💡 Make sure the line can logically extend to another element; otherwise, no change occurs

Step 5: Press

- Escape key or click Exit Sketch

Exit trim or extend mode and return to normal sketch editing

Before vs After

Before

Sketch has overlapping lines and lines that do not meet cleanly, causing gaps and extra segments

After

Sketch lines are trimmed to remove overlaps and extended to meet other lines, creating a clean, connected sketch

Settings Reference

Trim Type

📍 Trim Entities property manager

Controls how the trim tool behaves when cutting sketch lines

Default: Power Trim

Extend Direction

📍 Extend Entities property manager

Determines how the extend tool finds the target to extend the line to

Default: Extend to Nearest

Common Mistakes

Trying to trim lines that are not intersecting with others

Trim only works where lines intersect or overlap; otherwise, no change happens

Ensure lines cross or overlap before trimming, or use other sketch tools to adjust

Extending lines beyond the intended sketch elements

Extend tool only works to the nearest intersecting element; extending beyond is not possible

Check sketch layout and add necessary lines or points to extend lines properly

Summary

Trim and extend tools help clean and adjust sketch lines quickly.

Trim removes extra parts of lines; extend lengthens lines to meet others.

Use these tools only where lines intersect or can logically connect.