> For the complete documentation index, see [llms.txt](https://docs.revrobotics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.revrobotics.com/ion-build/motion/pivot-joints.md). # Pivot Joints The ION 1in Pivot Joint ([REV-21-2395-PK2](https://www.revrobotics.com/rev-21-2395/)) can be used in numerous ways within the ION Build System to create a pivot joint at the end of a piece of MAXTube - 1x1 or 2x1 with Grid Structure.

### Constraining Motion For designs where one or more MAXTubing needs to behave fixedly, like an elbow or a hinge. The Pivot Joint can constrain MAXTubing, allowing for rotational movement around a fixed axis for many degrees of rotation. 1. First, cut two 1x1 Extrusions to the desired length. 2. Next, insert four #10-32 x 3/8in Button Head Drive Screws into opposite sides of the Pivot Joint. Repeat for the other Pivot Joint. 3. Then, place a Tapped 1in 1/2in Hex Shaft into one of the Pivot Joints, and sandwich the two Pivot Joints together. Insert two #10-32 Shaft End Screws into the Hex Shaft to secure the assembly.

Two 1x1 MAXTubing in a typical elbow hinge configuration.

### Supporting Motion If your design calls for moving structures, the 1in Pivot Joint can serve as a shaft bearing to support a wheel. This allows a fixed point to have rotational movement, similar to the example picture. 1. First, cut the 1in Extrusion to the desired length. 2. Next, insert four #10-32 x 3/8in Button Head Drive Screws into opposite sides of the Pivot Joint. 3. Then, place a Tapped 1in 1/2in Hex Shaft into one of the Pivot Joints with a #10-32 Shaft End Screw. 4. From here, you will need to determine what size spacer would be best for your specific application. But in this example, a 1/4in Hex Spacer and a 1/8in Hex Spacer were used. 5. Finally, slide your Compliant wheel loaded with 1/2in Hex MAXHubs on the shaft and secured everything with a #10-32 End Screw.

1x1 MAXTube using a 1in Pivot Joint to capture an ION compliant wheel

## 1in Pivot Joint Example Applications