So I've been working on the mechanics of the fingers a bit more and I'll share the update.
You can download the fusion 360 file from here. It still need a lot of work and I'm still working on the best way to combine the thumb and wrist area. An stl is available on thingiverse at http://www.thingiverse.com/thing:908022
It's been my dream for a while now to make a prosthetic hand that is highly adaptable and yet mechanically sound. I've been using Fusion 360 for this task and below is an embedded link to a very basic test.
With these sorts of parametric systems it is very easy to get lost or put parameters in the wrong places. Hence I am ensuring that certain basic elements work before I start to get fancy with nice organic designs.
You can download a version that you can play with at http://a360.co/1BMrjEf
A reminder that I am still running a gofundme campaign for Hollies Hand. The above work I am doing is also connected to my prosthetics work. By having such a flexible hand design system I can make a hand that fits a scanned hand as opposed to fitting the mechanics to each individual hand manually (or more manually anyway).
Here is Hollies hand fundraising page.
If you can't donate then please share with your friends.
Now to fund my continued work on Hollies hand I've chosen to launch a GoFundMe.com campaign.
I also uploaded a video from a test I did on one of the prototypes.
It's quite basic and the torque required on the joints is higher than I would like. I fixed that in version5 but introduced more issues.
Anyway I'll be moving on to a hybrid version with pin joint bones surrounded by 3D printed elastic plastic skin. This would combine the strength of the joints with an elastic outer layer a bit like the flexy hand E-nable hand model. The problem is that it comes at extra cost and complexity. It should set me up well though for when multi-material printers start to mature.
I've been working on Hollies hand since the 3rd versions mechanism wasn't suitable. Here are some renders courtesy Blenders cycles render engine.
This version made a number of changes to the finger hinges to try and make them easier to move. I also removed tendon tubes from the inside the palm to reduce resistance to the tendons.
I also moved the thumb to an angle which would be more suitable for grasping. I also removed it's ability to move since it just added more resistance to the mechanism.
I moved the hinge to the palm to the back of the hand which again should help the tendons move.
The tendon anchors worked well so I kept them from the 3rd version. There are now only 4 tendons but 5 possible anchor. I could have removed one, but the tendon routing would have been more difficult and made it look unbalanced. Also +1 to redundancy.
Now I should be getting this on star wars day (may the 4th). It should take a day or so to add padding and tendons and then hopefully testing can begin.
Ok this is much more important than a new website look!
Deus Ex: Mankind Divided has been announced with a new trailer. I played the Original Deus Ex 14-15 years ago and it had a very formative experience on me. Deus Ex: Human Revolution added quite a large amount of fuel to the fire that drives my interest in prosthetics.
So I'm happy to announce the websites new look. The original design had hints of the 2000's about it and so I hope this new design brings it up to about the 2011-12 period.
On some other news the freelancing is picking up pace and so I should have more money to put into development work.
Now the photo of the website for social media linking and those on mobile etc etc.
Hey everyone. I have some big news about my current prosthetics project. I have gone and ordered the prosthetic hand from shapeways and it should be arriving in a weeks time. This has effectively been paid for by those who have bought from my shapeways shop, so thank you to all of you.
As you may be able to tell from the above renders I have finally learned how to use Blenders Cycles render engine!
Whilst the elastic elements don't yet neatly fit within the fingers this is due to the hand being quite small. As Hollie grows bigger they should disappear in later designs.
You may notice that the tendon torsioners are similar to James Holmes Siedle's design. This is because I re-engineered the idea for use in SLS nylon. I adjusted each block so they sat parallel with the back of the arm to maintain a sleek look. I also made two version of the rotary part of the tensioner.
I'll update the blog once I receive the hand. Hopefully it'll be ready for Hollie to start using.
Since I'm based in the UK it's always nice to see local stuff turn up. I also like seeing the digital descendants of my design from two years back.
I notice an interesting tensioner system by James Holmes Siedle. I'm reverse engineering it for Hollies hand since I wasn't happy with the screw version.
I was looking at my posts and realised I hadn't posted an update about hollies hand. This is about v3 of the hand which had some issues that would mean it wouldn't work. I've been doing some R&D on it and hope to have something coming together in the next few weeks. Unfortunately I have freelancing and consulting gigs to find that're distracting me.
I posted the design to thingiverse a while ago.
Here is a part of the version 4 hand, which involves fingers and hinges printed all as one piece.
For the last year I’ve been working at Hobs Reprographics as a 3D Printing technician. In this role I’ve mostly been taking peoples 3D files and converting them into a 3d printable format, as most programs can’t export suitable files on their own. I then printed them out in either a Projet 660 full colour printer or an ProX 800 SLA printer, and very occasionally a Cubex.
Anyway I learned a lot from Hobs, but as you may have noticed my blog posting had slowed down significantly. This echoed the slow development of what I was doing in meatspace. My main endeavour has been to make a prosthetic hand for Hollie. As I was only able to grab a few hours here or there, and was pretty tired even when I could, the progress was slow.
So I took the plunge again and have decided to set up as a freelance design and a 3D printing consulting expert. This should give me the flexibility to finish what I want to whilst providing an income.
So if you, or someone you know wants to design something for 3D printing then get in contact with me. Or if you’re with a company looking at getting into 3D printing but are not sure if you’d get the most out of it, or which of the hundreds of printers to buy, then again contact me.
I shall be setting up a dedicated website and twitter handle for the design and consulting job probably tomorrow. Pricing will also go on there. I’ll clean up this website and take advantage of some new shapeways apps. I’ll set up some permanent cross linking between my website, twitter facebook etc.