Clip-On-2DOF-Joint (no torsion)

thingiverse

Short video: https://www.youtube.com/shorts/4xGUdVfBQSs A 2-DOF joint inspired by the Tracta-joint. For infos about Tracta-joints see here: – https://commons.wikimedia.org/wiki/File:Tracta_Constant_Velocity_Joint.jpg – https://en.wikipedia.org/wiki/Constant-velocity_joint#Tracta_joints # Resistance against loads This joint prevents torsional motion. It is weak against tensile loads though due to it being **clip-on**. # Self-centering & Backlash It features self centering principles and some clip tension, thus (if clipping is strong and tight enough) this joint should have zero wobble and backlash. # Friction and wear This joint features plastic on plastic sliding. Thus it is not suitable for high speed and or high load applications. Moving it around a bit to break it in can help. Printing it in self-lubricating plastic may be beneficial. As long as sufficient clipping force remain preserved. # Symmetry Just like in a Tracta joint the two rotations in mutually orthogonal planes have colocated centers of rotation. => Simplifies math for kinematics. Unlike a Tracta joint it is symmetric. **Downsides of symmetry:** – reduced range of motion – undefined state of disassembly when pulling it apart as both clips are ~equal in strength **Upsides of symmetry:** – less part types # Customizatios Depending on your filament you may want to use adjust the variables **aglobal** and **tclipglobal** in order to get a better stronger clipping action You may want to change the X shaped struts to match your needs. If there's demand I could make this into a customizer model.