08/20/2014 at 14:22 •
It is a 3D printed Conforming Gripper actuated by a 3D printed linear actuator, controlled locally or remotely
The basic idea is to promote 3D printers as standard equipment aboard a Space station.
This way anything that gets broken can be easily replaced..... even designed by someone back at Houston... then beaming the STL file to be printed at the space station.
Also each Astronaut will have in his/her pocket a number of FPGA chips .... as they are like Programmable circuits capable of running systems in parallel.
All the 3D print STL files are already available as Open source ....links in the description.
06/25/2014 at 20:55 •
Just had my delivery of Conductive Ink & 3M Ear_Plugs !!!!!
I have started to make some custom Resistance Force sensors to fit to the push rod end of the actuator.
They will be used a a Force Feedback system so i will be able to calculate pushing forces..
The video of how I made them can be found Here :-
Its a messy job "2 by 2 Hands of Blue" however the results are promising - just have to design 3D printed housing for them.
This is the first "Stab" at creating some sensors.....
Here is a test of the foam sandwiched between two halves of a finger tip and lined both sides with copper foil for connectivity.
The resting resistance is circa 700 Ohms lowering down to 300 Ohms on compression.
Starting to take shape :-
Compression Chamber test print No.1
I need a Pull sensor and not a Push sensor so my first idea is to create a sliding piston type (the 3M Plug only alters slightly in diameter on compression meaning that it needs little clearance with the side wall)
Have to process 3M earplug and the Galvanised screw should be a Nylon one (or maybe not - have to test after ink is dry)
06/23/2014 at 16:01 •
A number of Hackaday members have PMed me asking which version motor is used.
Its a pretty generic one - and below is a Schematic of the dimensions that will fit my 3D chassis.
There are a number of variants of this motor type and there are even different Gear / voltage versions.
Search keywords ( DC Gear Motor yellow ) will get you in the right direction.
So anything that resembles these dimensions can be used.
06/05/2014 at 09:39 •
A number of people have contacted me with regards to the 3D building process to make one themselves :-
My best advice is only to be careful whilst printing the gear part.
.... its printed with a wall thickness of 0.4mm
as it makes a 0.4mm spline that fits into the slot of the feedback potentiomenter.
If your printer fails to make the spline then you can easily slot/melt in a thin metal vane. (no worries)
Its also a good idea to print the Leadscrew first to see how your printer deals with the overhangs involved (If they dont form neatly then reduce your Z steps to finer detail .....
06/05/2014 at 09:22 •
Why I designed this Linear Servo Actuator....... (the long story behind)
My old project Glue Stick + Servo = Linear Actuator had been troubling me for a number of years :-
It was bulky and Glue_y...... although it used off the shelf parts, it was not one of my neatest constructions... however it worked - and is still working..
My latest 3D printed actuator will be replacing the one I used to control my TriMaxGripper
06/05/2014 at 08:58 •
Currently the actuator is being controlled by MyRobotLab Open Source software
It is an Arduino/Mega based system environment with great connectivity for Robotic control .
Though I am currently writing a Parallax Propeller Service for the above to rev up the Baud rates.