Four different hinge arrangements:
Arrangement A – Single Shoulder Bolt
Arrangement B – Pin with two end screws and washers
Arrangement C – Pin with internal cir clip
Arrangement D – Pin with two external circlips
A useful tutorial for modelling involute gears: Link
I made a MeArm V0.4 using this tutorial:
I ordered most of the electronic parts from EBay and got the acrylic pieces cut by an online supplier. There’s also a kit available from Phenoptix which is probably cheaper overall.
I really like the design of the MeArm and there are some clever assembly features. The only issue I had was with some acrylic parts which had thin wall sections around the holes.Many of the screws have to be self-tapped into the acrylic which can increase the risk of cracking. I decided to use slightly shorter screws, and sometimes washers, to reduce the depth that the screws had to tap. I didn’t crack any parts, and the joints seem to be strong enough, so I would probably do this again.
A fantastic resource of CAD Mechanism Videos:
The second CAD Animation is of a Push to Close Latch. Created with Solidworks.
The aim of this mini-project was to create some simple Solidworks animations of interesting everyday mechanisms. The first animation – a retractable pen – was created with the help of this Instructable: http://www.instructables.com/id/Giant-Clicker-Pen/
Some interesting images for Flipper Mechanisms:
Above Image from: http://findinglincolnillinois.com/gambling/flippermechanism.jpg
Above image from: http://www.pinrepair.com/em/flip1.gif