AutoCAD

How to Use Tan Tan Radius in AutoCAD?

Understanding the Tan Tan Radius Command in AutoCAD

The Tan Tan Radius command is an essential tool in AutoCAD that allows users to create a circle that is tangent to two existing objects while specifying a desired radius. This functionality is especially useful for drafting designs where precise geometric relationships are required.

Step-by-Step Guide to Using Tan Tan Radius in AutoCAD

  1. Accessing the Command:

    • Start by navigating to the Drafting tab.
    • Within the Draw panel, click on the Circle drop-down menu. From there, select Tan, Tan, Radius (Ttr). This action will enable the tangent object snap mode.
  2. Selecting the First Object:

    • Click on the first geometric element that you want the circle to be tangent to. This could be a line, arc, or another circle. Ensure you are precise in your selection to maintain the integrity of your design.
  3. Selecting the Second Object:

    • Next, pick the second object that the circle must also be tangent to. The two objects will dictate the position and size of the circle.
  4. Specifying the Radius:
    • Upon selecting both objects, you will be prompted to specify the radius of the circle. Enter the desired radius value and press Enter. The new circle will now be drawn, perfectly tangent to both previously selected objects.

Applications of the Tan Tan Radius Command

The Tan Tan Radius feature is particularly beneficial in various engineering and design contexts, including:

  • Creating arcs and curves that seamlessly integrate with existing structures.
  • Designing components that require precise spatial relationships, enhancing overall design clarity.
  • Helping in the drafting of mechanical parts where circular elements must align tangentially with other shapes.

Frequently Asked Questions (FAQ)

1. What types of geometric objects can I use with the Tan Tan Radius command?
You can use a variety of objects, including lines, arcs, and existing circles. The key is that they must be in a position where a tangent circle can logically be created.

2. Can I modify the radius after I’ve created the circle using the Tan Tan Radius command?
Yes, you can modify the circle dimensions after creation by using the Properties palette to adjust the radius or by employing the scale or stretch commands.

3. Is the Tan Tan Radius command available in all versions of AutoCAD?
Yes, the Tan Tan Radius command is available in AutoCAD 2025 and all compatible versions, ensuring users can leverage this feature for accurate designs regardless of the software iteration.

About the author

Wei Zhang

Wei Zhang

Wei Zhang is a renowned figure in the CAD (Computer-Aided Design) industry in Canada, with over 30 years of experience spanning his native China and Canada. As the founder of a CAD training center, Wei has been instrumental in shaping the skills of hundreds of technicians and engineers in technical drawing and CAD software applications. He is a certified developer with Autodesk, demonstrating his deep expertise and commitment to staying at the forefront of CAD technology. Wei’s passion for education and technology has not only made him a respected educator but also a key player in advancing CAD methodologies in various engineering sectors. His contributions have significantly impacted the way CAD is taught and applied in the professional world, bridging the gap between traditional drafting techniques and modern digital solutions.