Shoulder Double Revolute Joint
Shoulder Double Revolute Joint
Published 2020-05-27T10:20:45+00:00
A double-revolute joint which serves as a shoulder joint.
Consists of three parts; Alpha, Beta and Charlie.
The 'Alpha' part is currently designed to slot over a piece of wood 29mm wide and 17mm high. It has a socket depth of approx. 15mm.
The 'Charlie' part is currently designed to slot over 20x20 aluminium extrusion.
A word of warning: the plastic nuts and bolts are pretty weak, especially if only printing in PLA.
Don't over-tighten or the top will snap off the bolt.
It's a good idea to use 25-30% infill at 0.15mm resolution for the main parts of the joint, then use finer 0.1mm resolution and 50% or higher infill for the nut and bolt, to give it a well-defined thread and ensure that the bolt is as strong as possible.
I found that a raft was necessary to prevent warping of the print on the hotbed. Any warping can affect the ability of the joint parts to fit together and move properly.
I use 'Ultimaker Cura' as my slicer software. I found that setting supports to 'Everywhere', then changing the 'Support Overhang Angle' to 68 degrees made it easier to remove infill from inside the joint holes, whilst still providing enough support for the joint to print accurately.
It also helps to have some small modelling files so you can smooth out the inside of the joint hole. It will have little burs left over from the support structures printed inside. The nut and bolt shouldn't require a great deal of filing or sanding though, especially if printed on 0.01mm 'fine' setting.
Date published | 27/05/2020 |
Time to do | 870 - minutes |
Material Quantity | 225 grams |
Dimensions | 102 x 63 x 40 |