6 votes

What are the calculations for a badminton robot and mechanisms?

In short, what you are trying to do is well beyond the capabilities of top robotics research labs. That said, here is a short list of general areas you need to look into: Robotic arm dynamics (to ...
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5 votes
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Industrial Robotic Arm

2 kgs is not very much, so i would probably consider arms that are slightly less industrial than Kuka, ABB, Fanuc, Denso and the like. However, 1.6m is pretty long and that may be hard to find in non-...
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What is torque bandwidth in actuated joints and how does it affect the control systems?

The torque bandwidth is typically referring to the maximum frequency of motion at which the actuator can provide that torque. So your actuator can provide a peak torque of 100 Nm, as in it can hold up ...
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  • 1,357
5 votes

How has the Mars Exploration Rover (MER) has been working for 11 years if it was designed for 90 Sol?

There are 2 main reasons why the MER is still operating long after it's 90 Sol planned lifetime. The first is political, strategic, and can be summarized as 'Under promise, over deliver'. When a PI (...
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  • 4,205
4 votes
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12V compressor and air pressure control

Whether a single 3-way, 2-position pneumatic valve (typically with a work port, an input port, and an exhaust port ‒ see page 3 of nationalpneumatic.com's pdf about valves) will suffice depends on ...
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4 votes

Beginner question about software for calculations

For most applications, I think the calculation you describe is good enough when selecting hardware. You want your arm to be able to have some lift capacity at the worst case, which is when the arm is ...
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4 votes
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Comparison of lifting systems

So this is summary...Open to discussions or edits... ...
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4 votes

Name of the linkage (or carriage) in video

The video shows 2 linear actuators driving a universal joint through ball and socket joints.
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  • 5,215
3 votes
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Beginner question about software for calculations

For your first example, Max-Weight = Torque/arm-length. Going beyond that, there are several software applications and API's out there that can be a big help for these kinds of calculations (matlab or ...
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  • 162
3 votes
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Simplest and cheapest way to create a spring back latch

What about using a simple RC-servo with a rotating cam that holds one pod. When rotating down It would drop the pod it is holding. When rotating up, it would lift the whole stack for one pod height ...
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3 votes
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Reverse lift mechanism

I assume that your 2 channels control forward/backward and left/right. But even if the 2 channels control forward/backward in each wheel (differential-drive style), it should still be possible to do ...
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3 votes
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Why linkage-based haptic devices are much more common than cable (tension)-based ones?

I think there might be different reasons for this. First, historical reasons The first systems with haptic feedback were mechanical systems to which vibration / force feedback functions were added (...
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  • 146
3 votes

Education sources for robot building?

Books FIRST and VEX are fairly large competitions, so it should come as no surprise that people have literally written books on how to participate. My favorite book aimed at FTC is FTC Robotics: Tips,...
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  • 411
3 votes

How can a memory alloy be used as an alternative to a compressor found in a refrigerator?

I don't think they're proposing building a compressor for use in refrigeration. They're proposing a solid-state cooler/heat pump based on the elastocaloric effect: As the shape memory alloy block is ...
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  • 1,001
3 votes

Lifting robotic leg with only one servo

Going forward, a Klann linkage has a near-vertical leg drop action. (See the legs at left in the wikipedia animated GIF.) It has a near-vertical leg lift action if running in reverse. (See the legs ...
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3 votes

How can this mobile robot rotate so perfectly?

If I understand correctly, you are referring to when the robot spins and the rack remains stationary (dynamic motions involving the rack mass seem to be slow as you would expect with such a high COM). ...
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What's the name of a robot manipulator construction with multiple thin arms joined together?

They are parallel manipulators. You may find chapters on parallel manipulators in robotics textbooks, for example, A Mathematical Introduction to Robotic Manipulation, useful. There are also a number ...
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3 votes
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Different methods to determine DOF: Chebychev-Kutzbach-Grubler method vs. Screw method

I will try not to skip too many steps. Assuming a Global coordinate frame at the base and the arm is fully extended along the Y-axis of the base frame. Since SCARA has four joints, we will create ...
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  • 103
3 votes
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High power jumping mechanism in small robots

Looks like it uses a propane powered ram to launch itself into the air. The end of the piston is visible in the back of the vehicle. This webpage states that source of power is battery and propane ...
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  • 403
3 votes
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Robot mechanism parts names

This is called a Stewart platform. You can use any linear actuator type, hydraulic, pneumatic or electric.
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3 votes
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What is meant by the phrase "movement positional jitter"?

We can think of "jitter" as a fairly quick, fairly small perturbation upon the intended controlled behavior. A semi-quantitative design guideline (like "within 5%") needs a ...
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  • 1,111
2 votes
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What is the Name of the part I'm describing

It sounds like you're describing a linear actuator with a pressure sensor (or strain gauge) attached to the end. To bridge that system across bluetooth, you may want to check out one of several ...
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  • 10.8k
2 votes

Industrial Robotic Arm

Based on your requirements, I would recommend the UR5 (0.85m range, 5kg payload) or UR10 (1.3 m range, 10kg payload) from Universal Robotics. Have a friend who has used it for work, and it performs ...
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  • 84
2 votes

What to use as electrovalve?

Generally you won't need a servo. The more common way to throttle a flow is to use pneumatic solenoid valves (which are either open or closed) and control them with PWM. See (for example) this ...
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  • 10.8k
2 votes

Mechanism to oscillate a needle like object in vertical motion

You might consider a Bistable Solenoid. This is a solenoid where the plunger locks into position at either end of its stroke, so that the current only needs to flow to change the state of the solenoid....
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  • 6,337
2 votes

Is this gear design feasible?

Hmm, thats definitely a unique idea. I think the shape of the top gear would have to be rounded off like half of a torus so it maintains a good interlocking through the motion from parallel to 90 ...
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  • 306
2 votes
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How does Fliike Smiirl counter mechanism work

As far as I can tell, you are asking how a "split-flap display" on things like the Flapit, the Smiirl Fliike, etc. works. flip clocks Some flip clocks -- "Retro Flip Clock", etc. -- use a single ...
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  • 4,375
2 votes
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How does a two-gear pull-back car toy work?

These types of low cost 2 speed transmission almost always are based on some gyroscopic effect on a simple gear train. You are right, even knowing how they work, I could not find any described on the ...
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  • 2,013
2 votes
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Fuses for mechanical systems

You are looking for a clutch. It is loaded device that 'gives' when the torque exceeds its set amount. Here is a LEGO clutch you can see how it works.
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  • 2,013
2 votes

How to distribute tension load on a three footed claw?

Tension distribution is easily accomplished using a simple mechanism called a whiffletree. Classically invented to allow several horses of different strengths to pull evenly on a single load, this ...
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