Questions tagged [mechanism]
A mechanism is a device designed to transform input forces and movement into a desired set of output forces and the movement.
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Floppy fish mechanism design
I've bought a floppy fish toy (crab version) for my kid. The toy looks like:
Unfortunately, the toy mechanism inside jams when grabbed and the battery lasts for a short time:
I tried to do my own ...
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How to connect a servo motor and a crank shaft
I have a standard 5v
I am using the horn it came with it, I mean this piece:
Like the long arm in the middle. Each of its holes are 1mm diameter.
Then I have a 3d printed crankshaft I did:
Its ...
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What geared mechanisms can convert various weak stepper motors drive inputs into a higher torque output?
I'm interested in making an arduino robotic arm for something that need precision and/or torque (like CNC), but first, I'm exploring/searching what I would need and how much it would cost.
What I ...
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How to use thrust bearing with shaft?
I know how to use radial bearings, e.g. ball bearings with shaft. But no matter how much I googled I didn't find any proper clear way to use thrust/axial bearing with shaft.
I downloaded the thrust ...
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How to turn direction of 4 planar wheels into up/down motion?
For the head in a 2D plotter I have 4 gears in an X configuration in the same plane. The gears are driven by belts from the outside in different combinations. The top and bottom gear can be turned in ...
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Automated high-precision weighing of individual parts
I'm trying to automate a process wherein individual small parts must be weighed one after another for identification / sorting.
The parts would be fed to the scale using a conveyor. A mechanism is in ...
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Recommendation for 3D mechanism modeling and simulation software
I'm working on a robotic hand and I would like to simulate different joints and tendon insertion points before starting to actually build it.
I've been googling and found things like Solidworks and ...
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What is the achievable stiffness of a impedance/admittance controlled robot (incl. haptic devices), given its structural and control stiffnesses?
EDIT: I realised I missed the point of the paper completely (thanks to very-skim reading ;) ). So, this part of it I'm relating to is about how much damping - not how much stiffness - should we ...
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Unilateral Torque Constraint on the foot-ground interface
I was studying the basics of legged locomotion and came across the unilateral force and torque constraints at the foot-ground interface.
I understood the implication of the unilateral constraint on ...
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Heavy omnidirectional platform suspension
I'm planning to build an omnidirectional platform that will support about 180kg robotic arm. The platform will be equipped in meccanum wheels. I would like to have some kind of suspension to avoid ...
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Advice on mounting a servo for a nerf sentry gun
I am trying to make a nerf sentry gun to shoot my co workers. I am building it more or less from scratch and have come to the part where I need to come up with plans to assemble it. I am looking for ...
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Actuation of three reciprocating blades via conversion of rotary to linear
Sorry if this is out of robotics, but this seemed the closest.
A motor has to be used to rotate three cranks. They are in the same plane, but each should not run at the same time.
Only one that ...
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Screw theory for kinematics/dynamics of mechanisms
Is screw theory commonly used for general kinematics/dynamics of mechanisms (not just robotics)? I'd be interested in anything that covers the types of mechanisms you would find in a typical ...
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How to find coefficient of friction that will maximize torque?
When using DC motors with a drive wheel (aka "direct drive") to propel a vehicle (e.g. an RC car), force and torque play a role in how efficiently that motor's power is transferred into ...
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Communication error
My Robot arm and controller battery got ablated it showed H1600 mechanism error.. did ram reset of the controller but controller not seeing robot arm. it is RV-2FB-D1-SM15 Robot arm and CR750 D ...
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Spherical Parallel Manipulator Lagrangian problem
I faced a very serious problem and I urgently need the help of specialists in robotics, mechanics, physics and mathematics.
I am trying to derive equations of motion from the Lagrangian of a spherical ...
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5 bar linkage hand exoskeleton
I have a project to design a hand exoskeleton for hand rehabilitation. The problem is that i'm thinked I only need the linkage mechanism with multiple 4 bar linkages. But because of human fingers ...
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How to create a jumping mechanism for a small robotic car?
I have to create a jumping mechanism for a small robotic car and was thinking about using a spring mechanism to do so. However, due to dimensions (16cmx8cm) and mass constraints (below 200g) I cannot ...
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What sort of robot would one use to tie precise knots in a string?
I need many knots tied repetitively and consistently in a string. I have been trying to make something which ties knots for me in a consistent manner. I've got a project which requires a few hundred ...
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How to make small quantities of gears
For a hobby project, I'm designing a clock with a single hand that makes one revolution per year. Using really helpful sites like https://geargenerator.com/, I have the gear ratios and dimensions ...
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