No-weld magnetics prosthetic hand

Some of the things that I did along the way of trying to make a left hand prosthetic…

In the beginning, before I put the Plasti-Dip rubber into the plastic tubing to hug around the mechanical aspect of the left hand…

 

Demo of the two finger prosthetic-video above…

 

first try at the left hand prosthetic

the wrist that supports the hand…(got covered in marble & made into a sculpture…both were too heavy)…
materials:armatures inside the marble…steel rods, bolts, copper strapping, aluminum mesh, copper wire, not welded but threaded instead! (Sari’s idea)…

 

This time I am going to cover this armature in black Plasti-Dip, a flexible rubber coating that will still allow the joints to move…The point of this complex armature is that it bends at all the finger joints & at the wrist…I really don’t know if I will be able to make prosthetics that can be usable, but I figure it doesn’t hurt to try, right?
Sari’s Homemade marble recipe: Circa 1850 powdered resin, Aragonite sand, 3/4″ alkaline resistant glass fibres, water…On top of no-weld armature: 10-24 threaded steel rods, bolts, 1/2 inch copper strapping, wrap with aluminum screen mesh tied on with copper wire…Last step: patina al fresco with real gold powder & resin with water…Notes: I cooked the piece later in the oven on low, which made the marble set better…Warnings: wear a respirator when working, the glue fumes are headachey…

(the gold one)It’s made of homemade marble…On top of a no weld armature design that I came up with ’cause Joseph wouldn’t let me weld…A gallerist broke the hand one day when she picked up the hand part (it’s in 2 parts) & dropped it because she was surprised by the weight of it…The inside is heavy due to the steel rods & bolts & aluminum mesh screening…Also marble is heavy…But I left the break because it shows how an integral steel armature keeps marble from shattering…It is an important difference when a sculpture has an internal armature that is solid…lasts longer & is easier to fix when dropped…Covered in a real gold powder mixed with latex adhesive milk, brushed in al fresco (while marble was soft still)…It also went into the oven at 300 degrees Farhenheit for several visits…I found out, while trying to repair the crack, that cooking the marble turns it into sort of porcelain…So it seems that porcelain is really just cooked marble…Neat eh? (accidents always happen for a reason don’t they? Never would have discovered this if the marble hadn’t gotten dropped)…)

Notes:Ok so Powdered resin means powdered glue…You can actually use liquid glue too…Liquid glue is way easier to find in stores! Aragonite sand is calcium carbonate sand-you get this at pet stores, I got mine from Petsmart in the reptile section…Aragonite is a form of marble, so Aragonite sand is basically marble dust…But buying a bag of marble dust is really not easy at all…So go to the fish reptile section of your pet store & look for calcium carbonate sand or aragonite sand…That is marble! The alkaline resistant glass fibres are another strange beast…You can find these either at a sculptor supply house or from a company that specializes in cement supplies…The cement guys have the 3/4 inch version…The sculptor suppliers will have shorter one likes 1/2 inch…The glass fibres really help your marble hold together better, even just while you are applying it…It really is worth finding…It makes your sculpture a million times stronger…

Material Choices: M—, that is a question I ask myself all the time…Myself, I started with traditional materials…My mother stuck me in a ceramics lab at a local Y when I was just a dumpling…

There were real potters there…I learned the feel of clay, how to turn something on a wheel, how to make patinas & how they turn out if you fire them…Clay is hard & you learn that many shapes are not practical…It slumps…Colour is hard to guess…But it is a good learning ground for touch…That stays with you…Years later I wanted to be more serious…

I got several large pieces of alabaster, I mean LARGE…I got a chisel & hammer & decided I was going to carve pieces of a human body, to be strewn all over an outdoor garden…Carving like that is very robust, very physical…But wow you have to sand things…Sanding takes like months…I didn’t like the sanding part…Plus I was frustrated that arms & legs couldn’t protrude-they break if they are not tight into the work…Some more years later a product called Winterstone came out…It is basically a concrete type powder you mix with water…You build like a frame, am armature, then put mesh on that, then cover that mesh with the Winterstone…It comes ready to go…It is nice…This was more flexible for me…But it got expensive & I thought maybe I could figure out how to make the powder myself…Found out they call this “Ferrocement”…

There are books & groups you can join for Ferrocement…It is another “accepted” medium…I learned & designed my own custom mix, then I learned how to make an armature without welding…Then I decided to use my knowledge to make marble instead of cement…Cultured marble is also accepted…

But my husband thought my armatures were so cool he said I should leave them bare…No marble or cement…But I wanted colour so I started knotting coloured rope onto the frames…Which is sort of accepted as an art form, there are steel & nylon sculptures, but it is still a little out there…I am out on that limb right now, trying to decide whether I should go further with the rope & steel or whether it is too out there…In the meantime, I still have a homemade marble sculpture that for some reason I am covering pats of it with artificial grass & moss…

It is looking a bit now like those outdoor garden landscape sculptures-which are very chic right now- the ones with real grass & moss! So I am getting more ridiculous & less “accepted” in my media as I move forward…I think possibly this is how that progression works…I am actually careful about perceptions that way…

I like to be original but not so much that it is just weird…Polymer clay is really really cool to work with if you want to make prosthetics or miniatures…But yes, some artists are snobby about polymer-it is a niche group…Two part epoxies like Apoxie Sculpt are very much like Winterstone- a concrete type material…I love that stuff too! A little pricey for a large work …Blowing glass is HARD…Wood is a niche too-I feel guilty about using wood so didn’t really go there…Made a cheese board once…Alot of sanding too…Bronze is a million dollars…You work in wax then often someone else casts for you…Then artists snob out that you didn’t pour the bronze yourself…
Read More about the Spare hand…

 

This is a thumb & index finger prototype…I am starting again, again…

New magnetic spare hand


A spare hand project, some of the prototypes…( for someone who is missing their left hand, born that way…
Thanks to Gwylym Owen @iliteratepoet on twitter for helping me come to the newer lighter more simplistic spare hand design…Gwylym spent many hours researching prosthetic hands for me, which helped me to coalesce the concepts…

 

new magnetic spare hand version blog post

http://sarigrove.com/2013/02/11/sparrycarry-looking-for-a-name-for-a-prosthetic-hand-that-helps-you-to-carry-things-a-spare-hand/

Admin 

(Biography chatter:from my Author Central page on Amazon-Grove Health Science is a series of 12 books now!) Hi...I'm Sari Grove...Sari sounds like Mary...Grove is the last name I took from my husband, 'cause it is a really nice name, & he was very very good looking, & I married him, & my maiden name, the name I grew up with, was "Slatt", which could be turned into all sorts of unfortunate words, which is why when I was looking for a mate, I sought someone with a cool last name...(I cannot tell you how many totally worthy men I had to ignore due to their last names being unmelodic or otherwise unsuitable...) Grove Canada is a pen name, mostly because when I needed a web address, I could not get Grove.com or even grove.ca, so I just got GroveCanada, due to a serious lack of imagination in that moment...It stuck, so I still use it...I thought this time, if I used Grove Canada as a pen name, that maybe you might look up my blog online, at GroveCanada.ca, & enjoy the freshness of getting information from the horse's mouth, up to the minute, rather than the instant obsoleteness that a book creates...Like a car depreciates as soon as you buy it-a book is old as soon as it is published...For a Virgo perfectionist, this inability to easily update, with a new chapter, with new research, causes me constant worrisome self-abnegating, consternation... I use those dot dot dot things, the etcetera symbol, at the end of my sentences, as a habit-you will always know it is me writing, you will always pause at the end of a sentence to think for a moment, you will remember that poetry is beautiful, & you will take everything I say with a giant grain of Pink Himalayan salt(since the grammatical error will irk you into that state of skepticism)! Love & Hugs, Sari ps. I became a Christian at the age of 21, which may seem like a non sequitur, & though my faith is decent my works may not really do justice to that title-but I thought I'd mention it, since my first name Sari always seems to force an assumption about my background-and though you would be right to assume that it tends to be a Jewish name, you might not be right in assuming that that is what I am going to sound like when I expound on some of my karmic principles or other ethical compasses I have developed...Not that I have done away with my past, it is just I have iced the cake with the new updated version-so if you wrong me, I may just turn the other cheek(New), instead of doing the eye for an eye thing back at you!(old)...

Related posts

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.