When detailing long components—such as shafts, pipes, cables, or structural beams—we often use broken views to save layout space while preserving clarity. The challenge appears when we need to place a linear dimension on a shortened representation of an object.
AutoCAD provides a native command for jogged radius dimensions (DIMJOGGED), but it does not offer a dedicated jogged linear dimension tool. There is no “DimJoggedLinear” command. As a result, we must rely on controlled, standards-compliant workarounds to show the true dimension value while clearly indicating that the graphical length is not to scale (NTS).
This article consolidates professional methods used in production environments and expands them with best practices for standards compliance, associativity, and long-term drawing integrity.
The Core Problem
The native DIMJOGLINE command applies to geometry objects (lines, polylines, arcs), not to dimension objects. It cannot attach a jog to a dimension line.
The requirement is specific:
- Display the true length (e.g., 5000 mm).
- Represent the object using a shortened graphic (e.g., 250 mm on paper).
- Visually indicate the shortening using a zigzag (jog) symbol.
- Remain compliant with ISO 129-1 or ASME Y14.5, where interrupted dimension lines must be clearly indicated.
Without a native tool, we must build a reliable method.
Professional Solutions
1. The Dim-Break + Block Method (Best for Speed and Control)
This is the most widely used production method.
Workflow:
- Create the linear dimension normally.
- Use
TEXTOVERRIDEto display the true length. - Insert a jog symbol on top of the dimension line.
- Use
DIMBREAKto create a clean gap where the symbol sits.
Creating the jog symbol:
- Use the EXPRESS TOOLS command
BREAKLINE, or - Create a small custom zigzag block.
For better drafting control:
- Add a Background Mask to the block.
- Make the block Annotative so it scales correctly across viewports.
- Keep it on a dedicated layer (e.g., DIM_JOG).
This method preserves the original dimension object and avoids exploding it.
2. The Custom Arrowhead Strategy
If foreshortened dimensions are frequent in your workflow, modifying the dimension style is more efficient.
Procedure:
- Open
DIMSTYLE. - Go to Symbols and Arrows.
- Under User Arrowhead, assign a custom block that integrates a jog shape.
- Apply this style only to dimensions that require shortening.
Advantages:
- Clean alignment with extension lines.
- No manual overlay adjustments.
- Standardized appearance across drawings.
This approach works well in environments with strict drafting standards.
3. The “Pseudo-Jog” via MText and Manual Graphic
For one-off cases under time pressure:
- Double-click the dimension text.
- Use the MText editor to adjust spacing.
- Draw a small zigzag polyline manually.
This method is acceptable for temporary deliverables but not recommended for production drawings that will undergo revisions.
It lacks robustness and may break visual consistency across layouts.
4. Advanced Method: Dynamic Annotative Block with Attribute
For advanced users managing repetitive details:
Create a dynamic block that includes:
- A parameter controlling the visible shortened length.
- An attribute storing the true dimension value.
- A built-in jog symbol.
- Annotative behavior.
Benefits:
- No
TEXTOVERRIDE. - Reduced risk of outdated values.
- Cleaner QA review process.
- Better control in multi-user environments.
This method requires setup time but pays off in long projects.
5. Using Fields Instead of Static Overrides
If you use TEXTOVERRIDE, consider inserting a FIELD that references the real geometry length.
This reduces manual errors when:
- The model changes.
- Dimensions are updated.
- Drawings are reused.
A field-based override is safer than typing a static value.
Standards Considerations (ISO / ASME)
Under ISO 129-1, dimensioning must avoid ambiguity. If a dimension line does not represent the graphical length, it must be visually interrupted.
Under ASME Y14.5, similar clarity principles apply. The jog symbol communicates that:
- The value shown is correct.
- The geometry has been intentionally shortened.
Do not omit the jog. A shortened line without visual indication is non-compliant.
Risks and Best Practices
Avoid Exploding Dimensions
Never explode dimensions to manually draw a jog.
Exploding:
- Breaks associativity.
- Prevents automatic updates.
- Complicates revisions.
- Creates long-term maintenance issues.
Control TEXTOVERRIDE Usage
When using TEXTOVERRIDE:
- Document it in internal drafting notes.
- Include it in QA checklists.
- Prefer field-based references when possible.
Manual overrides are a common source of dimensional errors in revision cycles.
Layer Discipline
Place jog blocks on a dedicated dimension layer. Maintain consistency across layouts and viewports.
Collaboration and BIM Exports
In workflows involving:
- Civil 3D
- Plant 3D
- Revit exports to DWG
Manual overrides can cause:
- Misinterpretation during coordination.
- Data extraction inconsistencies.
- Issues during model-based quantity takeoffs.
Always verify foreshortened dimensions before issuing IFC or fabrication drawings.
Method Comparison
| Method | Speed | Reliability | Recommended Use |
|---|---|---|---|
| BREAKLINE + DIMBREAK | High | Medium | General detailing |
| Custom Arrowhead Style | Medium | High | Standardized offices |
| Manual MText + Polyline | High | Low | Temporary fixes |
| Dynamic Annotative Block | Medium | Very High | Repetitive production environments |
Veteran’s Advice
If a dimension is not drawn to scale, the drawing must make that fact unmistakable.
Use a Background Mask on jog blocks. Keep dimensions associative. Avoid unnecessary overrides. Never compromise clarity for convenience.
A drawing is not just a graphic—it is a legal and fabrication document.
FAQ
Does AutoCAD have a native “Jogged Linear” dimension tool?
No. AutoCAD supports jogged radius dimensions (DIMJOGGED), but there is no native jogged linear dimension command. Linear jog representation must be created manually.
Can I use DIMJOGLINE on a dimension?
No. DIMJOGLINE applies only to geometric objects, not dimension objects.
How do I make the zigzag scale correctly across viewports?
Create the jog symbol as an Annotative Block. This ensures consistent size across different viewport scales.
Is it acceptable to explode the dimension and draw the jog manually?
No. Exploding breaks associativity and creates maintenance problems. Always keep dimensions intact and use DIMBREAK or a block overlay.
Is using TEXTOVERRIDE considered bad practice?
It is acceptable when controlled. However, it introduces risk. Use fields when possible and include override checks in your review process.
Which method is best for long-term projects?
For repeated use, a dynamic annotative block or a controlled custom dimension style provides the highest reliability and consistency.
This expanded approach covers practical drafting methods, standards alignment, risk management, and production-level control.
