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Magnetic joints and selfassembling ... September 22, 2007 03:11PM |
... hi folks,
i sort of invented a self-assembling-mechanism for macroscopic joint-structures and flexure hinges, as known in flex-joint parallel kinematics.
In the image below you can see a tripod-sample with this joints, i 'assembled on the fly' in two minutes - if i set it on three linear drives, then the fully functionable tripod-system for reprap-dispensing or micro-tooling is ready
The rods are magnets from a toy-mag-box of my children, but the balls are not from steel, but spherically shaped neodym-magnets ( [www.supermagnete.de] , ~50 cents).
With the stacking of mechanic-parts with spherical magnets or perpendicular magnetised rods i can easily build highly precise, stiff and stip'n-slick-free joints and flexure hinges, which are nearly fail-resistant (if they rip apart, i only have to reassemble them again ...)
My actual interest goes in parallel kinematics, but maybe this method is useful in joining and (self-) fixing of other structures too?
Bye, Viktor
Edited 1 time(s). Last edit at 09/22/2007 03:15PM by Viktor Dirks.
i sort of invented a self-assembling-mechanism for macroscopic joint-structures and flexure hinges, as known in flex-joint parallel kinematics.
In the image below you can see a tripod-sample with this joints, i 'assembled on the fly' in two minutes - if i set it on three linear drives, then the fully functionable tripod-system for reprap-dispensing or micro-tooling is ready
The rods are magnets from a toy-mag-box of my children, but the balls are not from steel, but spherically shaped neodym-magnets ( [www.supermagnete.de] , ~50 cents).
With the stacking of mechanic-parts with spherical magnets or perpendicular magnetised rods i can easily build highly precise, stiff and stip'n-slick-free joints and flexure hinges, which are nearly fail-resistant (if they rip apart, i only have to reassemble them again ...)
My actual interest goes in parallel kinematics, but maybe this method is useful in joining and (self-) fixing of other structures too?
Bye, Viktor
Edited 1 time(s). Last edit at 09/22/2007 03:15PM by Viktor Dirks.
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Re: Magnetic joints and selfassembling ... November 20, 2007 01:35AM |
Hi RoundSparrow,
... with the Tripod i'll try to develop a sort of easy to assemble 'micro-reprap' with much higher accuracy, as achievable with a FDM-extruder.
With the magnetic joints and the parallel kinematics i only need three linear drives as showed in my setup, six rods, two plates for fixing the drives and a third plate for the toolhead (plus some screws and glue for fixing)
As the size is scalable up and down freely, i can design a much smaller setup (and a very big one for buildung furniture or so too ), so it's possible too to make a sort of 'Tripod-toolhead', which sits as tool in my cartesian 3D-cnc-mill ...
My primary goal is to make very small and accurate parts from pastes i mix from glass- or ceramic-powder (and other materials too) with different fluids.
In my first experiments with glass- or gold-powder in dexpanthenol+water i extrude/dispense much smaller trays and dropplets as possible with the FDM-head - i achieved trays with 0,1 mm width and single droplets of maybe 50 microns with a syringe and nearly 20 microns with a dip-pen-dispenser.
By heating the paste with a diode-laser i dried the solvent away and then melted the powder to solid.
With the gold-paste i managed fixing and contacting of 1-micron-diameter platinum-wires on goldpads for a very precise gas-temp-sensor.
With the glass-paste (and later some ceramic-pastes) i want to fab the body of sensors - when i can in the same process (but with two syringes filled with ceramic- and gold-paste and a diode-laser-head for sintering) build the rigid sensor-body and interlayer gold-wires and vias, then it's running right
***
In another developing-path i'll insert only the diode-laser in the head and layer (or roll as in a lathe-setup) many plastic-sheets on the basis-plate (or -axis), where i cut sheetwise the contours and separating-lines - so with glue-stacking all the sheets to a solid block i'll have a LOM-body (LOM=Laminated Object Modelling/Manufacturing) with the inlaying 3D-object(s) - i only have to brake the outer volume off to 'free' the objects
The LOM-approach is very much faster then normal extruding, as i only have to process the outlines and some separating lines, not every point of the 3D-object ...
***
And a third possible path is the inserting of a normal ink-jet-printhead and either print with a glue-solvent on a powder-surface as in Z-corp 3D-printers, or only print the contours and separating lines (as in the LOM) with salt-water and heat the powder-surface until it melts, so i'll have a solidified and more rigid body, as in powder-glueing ...
Viktor
Edited 1 time(s). Last edit at 11/20/2007 01:39AM by Viktor Dirks.
... with the Tripod i'll try to develop a sort of easy to assemble 'micro-reprap' with much higher accuracy, as achievable with a FDM-extruder.
With the magnetic joints and the parallel kinematics i only need three linear drives as showed in my setup, six rods, two plates for fixing the drives and a third plate for the toolhead (plus some screws and glue for fixing)
As the size is scalable up and down freely, i can design a much smaller setup (and a very big one for buildung furniture or so too
), so it's possible too to make a sort of 'Tripod-toolhead', which sits as tool in my cartesian 3D-cnc-mill ...My primary goal is to make very small and accurate parts from pastes i mix from glass- or ceramic-powder (and other materials too) with different fluids.
In my first experiments with glass- or gold-powder in dexpanthenol+water i extrude/dispense much smaller trays and dropplets as possible with the FDM-head - i achieved trays with 0,1 mm width and single droplets of maybe 50 microns with a syringe and nearly 20 microns with a dip-pen-dispenser.
By heating the paste with a diode-laser i dried the solvent away and then melted the powder to solid.
With the gold-paste i managed fixing and contacting of 1-micron-diameter platinum-wires on goldpads for a very precise gas-temp-sensor.
With the glass-paste (and later some ceramic-pastes) i want to fab the body of sensors - when i can in the same process (but with two syringes filled with ceramic- and gold-paste and a diode-laser-head for sintering) build the rigid sensor-body and interlayer gold-wires and vias, then it's running right
***
In another developing-path i'll insert only the diode-laser in the head and layer (or roll as in a lathe-setup) many plastic-sheets on the basis-plate (or -axis), where i cut sheetwise the contours and separating-lines - so with glue-stacking all the sheets to a solid block i'll have a LOM-body (LOM=Laminated Object Modelling/Manufacturing) with the inlaying 3D-object(s) - i only have to brake the outer volume off to 'free' the objects
The LOM-approach is very much faster then normal extruding, as i only have to process the outlines and some separating lines, not every point of the 3D-object ...
***
And a third possible path is the inserting of a normal ink-jet-printhead and either print with a glue-solvent on a powder-surface as in Z-corp 3D-printers, or only print the contours and separating lines (as in the LOM) with salt-water and heat the powder-surface until it melts, so i'll have a solidified and more rigid body, as in powder-glueing ...
Viktor
Edited 1 time(s). Last edit at 11/20/2007 01:39AM by Viktor Dirks.
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Re: Magnetic joints and selfassembling ... May 09, 2025 05:04AM |
... as I've stumbled over this Thread from 28 years ago, here some maybe interesting "update" 
Some of the ideas and concepts, mentioned here, were developed for R&D-projects in/for my day-jobs.
Actually I'm starting another R&D for "laser-multimaterial-micro/nano-3D-pronting" with a sort of laser-thermotransfer approach, where I'm transferring super thin sheets of all sorts of materials (plastic, ceramic, metall, ...) on any sort of surface ... either "pure" or intermixed materials for more complex structures.
Her two smaple images - a test with copper with resultet sheet "thicknesses"from some nanometers to some microns ... or conducting traces on different surfaces (glass, plastic, paper):
Or black ceramic on a 20x20mm tile:
Or a demonstrator sample of a LOM-approach:
Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]
Call for the project "garbage-free seas" - [reprap.org]
Some of the ideas and concepts, mentioned here, were developed for R&D-projects in/for my day-jobs.
Actually I'm starting another R&D for "laser-multimaterial-micro/nano-3D-pronting" with a sort of laser-thermotransfer approach, where I'm transferring super thin sheets of all sorts of materials (plastic, ceramic, metall, ...) on any sort of surface ... either "pure" or intermixed materials for more complex structures.
Her two smaple images - a test with copper with resultet sheet "thicknesses"from some nanometers to some microns ... or conducting traces on different surfaces (glass, plastic, paper):
Or black ceramic on a 20x20mm tile:
Or a demonstrator sample of a LOM-approach:
Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]
Call for the project "garbage-free seas" - [reprap.org]
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