Osprey - 2015
Back to: [Hand Devices](wiki:/s/e-nable-devices/wiki/Hand+devices#null "Hand devices")
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# 1. Basic Info
![](https://drive.google.com/uc?export=download&id=15fcw599g6e0cVFzg0wua1Mfh5HQeATJr)
**Author:** Peter Binkley
**Device type:** Hand
**Minimum user needs:** Functional wrist and enough palm to push against the device
**Type of device:** Mechanical
| Maturity | Cost of Materials | Popularity | Assembly difficulty | Grip Strength |
| --- | --- | --- | --- | --- |
| ![](https://hub.e-nable.org/custom/assets/deviceRatings/Maturity-High.png) | ![](https://hub.e-nable.org/custom/assets/deviceRatings/Cost%20of%20Materials-Medium.png) | ![](https://hub.e-nable.org/custom/assets/deviceRatings/Popularity-Low.png) | ![](https://hub.e-nable.org/custom/assets/deviceRatings/Assembly%20difficulty-Medium.png) | ![](https://hub.e-nable.org/custom/assets/deviceRatings/Grip%20Strength-Medium.png) |
To learn about what each of the above icons represents, please refer to the [Device Ratings Guide](wiki:/s/chapter-spotlight/wiki/Project+Ideas+%26+Suggestions#null "Project Ideas & Suggestions").
**Development status:** Complete
**Basic data**
- Number of parts: 🔴
- Assembly time (estimated): 🔴
- Store-bought parts: velcro straps, set screws, nylon monofilament
- Number of known builds: 🔴
- Grip type: 🔴
- Actuation type: Wrist powered device, monofilament used for both closing and opening
- Scalability: only via slicer
**Basic description**
A very old but reliable design, featuring no springs or elastics.
**License:** ?
**Credit and Contributions:** ?
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# 2. Links
**Main STL Files:** https://www.thingiverse.com/thing:910465
**Major Modifications:** 🔴
You can request a modification in the comments below
**Source Files:** Blender: https://drive.google.com/open?id=0B8hEOcqfYTbOeWl4Rkd4eFpqelE
**Instructionals:**
[https://youtu.be/_SWHmAPipcI](oembed:https://youtu.be/_SWHmAPipcI)
https://docs.google.com/document/d/1xbfhPYKO-4hcpnAmYpvGPY-vzPpO1QTiwvFZkcN3034/edit?usp=sharing
**Editors and Customizers:** https://bymu.eu/customizer/?device=osprey-hand
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# 3. Makers
![](https://drive.google.com/uc?export=download&id=15fcw599g6e0cVFzg0wua1Mfh5HQeATJr)
**Bill of Materials**
- monofilament
- velcro straps
- set screws
**Tools:** none
**Recommended print settings:** missing printing reccomentations 🔴
**Print time** for 100% scale: 🔴
**Weight** for 100% scale: 🔴
**Device advantages:** 🔴
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# 4. Educational
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 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)
No historical credits available.
No other related educational resources available. 🔴
**Have you created other related educational content or resources?** We'd love to feature your work!
Moreover, if you want to contribute, but don't know how, help us learn more about our own devices.
The red marks (🔴) are there because we don't have that information yet. If you figure it out, please leave it in the comments of this page, and an admin will put it in the page, and you'll get your name in the Contributions section.
Thanks for your help!
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# 5. Engineering
missing engineering schematic of the device 🔴
**Actuation data**
Wrist up-down movement is transferred to the fingers via a solid monofilament that goes through wire channels above the hand and underneath the artificial fingers. Bending the wrist down closes the fingers, by pulling on the monofilament, and the reverse opens the fingers.
**Joint data**
Finger joints: Pin based, using 3d printed pins
Wrist joints: 2, sideways, pin based, using 3d printed pins
**Number of finger joints:** 2
**Flexion data:** Monofilament, secured in the forearm socket with set screws, and at the tip of the fingers
**Extension data:** It does not have an independent extension system
**Socket data**
The hand socket is solid, and can be adjusted by scaling directly in the slicer, and similarly the forearm panel. The forearm panel is connected with velcro straps to the user, to ensure a good and comfortable grip. Medical padding can be used for both, as most plastics are not advisable for prolonged skin contact.
**Grips:** 🔴
**Bionic data**
N/A
**Known issues and solutions**
no issues have been reported
Do you know of an issue with this device? Do you have a solution for a common issue? 🔴
**Help resources**
please ask on the main Hub if you need assistance, or in one of the weekly meetings.
**Requested Modifications**
no modifications have been requested at this point
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# 6. Lists & Media
no photos available 🔴
**Media links:** no links available 🔴
**Community Contributions:** no community contribution yet
**Help needed** 🔴🔴🔴🔴🔴
The red mark (🔴) indicates that we haven't aquired that information yet, and we need your help. If you see such a mark and have the time to figure that data out, please note it down in the comments of this page! An admin will put it as official content as soon as they see it, and you'll get mentioned in the Contributions at the end of the page.
Thank you for your help!