1. Links in Technical objects
A link is a fastening unit that attaches two parts of an object together
Different types of links have different characteristics

2. Direct: the parts “fit together” without a linking component, like puzzle pieces or Lego blocks
Indirect: the parts need a linking component (like glue, a screw, a rivet…)

3. Rigid: there is no bending between the linked parts
Flexible: one of the linked parts can bend (be deformed) without breaking the object

4. Removable: the parts can be taken apart without causing damage to the object
Non-removable: taking the linked parts apart will damage the object (aka “permanent” link)

5. Complete: no movement between the linked parts
Partial: there can be movement between the linked parts

6. Types of Guiding Controls
Translational:
component that allows for translational movement (Ex: groove that allows drawers to slide).

7. Rotational:
Component that allows for rotational movement (Ex: toilet paper dispenser)

8. Types of Links
Motion performed by the guided part determines its link type.

9. Fixed Link
No movement between parts.

10. Rotating Link
Guided part can undergo rotational motion around one axis

11. Sliding Link
Guided part can undergo translational motion on one axis

12. Sliding rotating link
Guided part can undergo rotational and translational motion on the same axis

13. Spherical Link
Guided part can undergo rotational motion in many directions.

14. Helical Link
Guided part can undergo helical motion.