Osprey Hand Hand Designs [Currently...
Last updated by Mazvydas Sverdiolas
# Osprey Hand --- ![Osprey.jpg](file-guid:9366cd4e-e764-4f55-879d-4f787bcb906c "Osprey.jpg") To learn about what each of the above icons represents, please refer to the [Device Ratings Guide](wiki:/s/e-nable-devices/wiki/page/view?title=Device+Ratings+Guide "Device Ratings Guide"). --- ![fullsizeoutput](file-guid:38656096-296a-456a-b580-0ef531eed846 "fullsizeoutput_3bf.jpeg") **Designer:** Peter Binkley **Description:** This is a wrist-powered device. To use this design, the user must have a functional wrist and enough palm to push against the device to force the fingers closed when wrist is bent. For more information, see the [Which Design](wiki:/s/e-nable-devices/wiki/page/view?title=Which+Design%3F#null "Which Design?") page. The Osprey was built in Blender based on the low-poly interior and robust components of the original Raptor Hand, but now sports an attractive fairing and a very durable and comfortable low-profile universal-fit bracer. The osprey (Pandion haliaetus), sometimes known as the fish eagle, sea hawk, river hawk, or fish hawk, is a diurnal, fish-eating bird of prey. (Wikipedia) This device was named the Osprey because it is a Raptor, but optimized for the use of heavy gauge nylon monofilament, most widely available as fishing line. The large mono has excellent Bowden properties, so the cables are pulled to provide flexion and pushed to provide extension. This device requires neither elastics nor springs nor any mechanical extension system. Heavy gauge nylon monofilament is an excellent cabling material. It is generally inexpensive, and available as landscapers’ trimmer line, nylon or Bridge nylon 3d printer filament, and as deep sea fishing leader line. Running through joints, it doesn’t abrade at all, so there’s no “sawing” of printed plastic. Nylon is very strong, so it is rarely a point of failure for mechanical devices. But probably its greatest quality is its linear resistance to compression, so it pushes as well as pulls, like the bicycle cabling used to change gears. Elastic resistance is a major drawback to many assistive devices, because resistance reduces a device’s grip strength. Furthermore, as an elastic-extended device approaches full actuation, resistance from elastics increases, so that it may be quite difficult for a user to grasp small objects. Designs which reduce or eliminate elastic resistance are a welcome development. Pay particular attention to the new bill of materials. The Cyborg Beast, the original Raptor and the Raptor Reloaded hardware kits are not compatible with the Osprey. However, the Osprey does use the same hardware as the Gamma Raptor. Materials kits and tool kits should be available in the near future, so stay tuned. * In this version: * Elastic-free Bowden cable design; enclosed channels provide enhanced cable control * Vestigial dorsal extension channels can now be used for knuckle vise, other secondary tools, or electronics. * Fairing has a new aesthetic. * Pin-and-Proximal sets to manage tolerances (“A” is loosest; “D” is tightest) * Very durable low-profile universal fit bracer(gauntlet) --- # Files and Resources **STL Files:** [Link](https://www.thingiverse.com/thing:910465) **Source CAD Files:** .BLEND files for the Osprey design, which are mesh files, not solid-body models, can be found [here](https://drive.google.com/open?id=0B8hEOcqfYTbOeWl4Rkd4eFpqelE). To use these files, download a free copy of [Blender](https://www.blender.org/) **Instructions:** [Link](https://docs.google.com/document/d/1xbfhPYKO-4hcpnAmYpvGPY-vzPpO1QTiwvFZkcN3034/edit?usp=sharing) **Assembly Materials Kit:** Contact [Peter Binkley](http://firstname.lastname@example.org) **Video Tutorial:** [Link](https://youtu.be/_SWHmAPipcI) **e-NABLE Device Color Customizer:** [Link](https://bymu.eu/customizer/?device=osprey-hand)