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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 numerator and denominator. An arm that is supposed to move 20 cm allowing 1 cm wobble (5% of the distance) sounds pretty sloppy. A controller that overshoots by 5% ...


2

I've used Spectra® braided fishing line for a cable driven robot hand. (I believe there are many similar products by other brands). I think it would probably work for your application too. Steer clear of monofilament fishing line. They probably have too much stretch. This new type of braided fishing line is super strong and abrasion resistant. Being a ...


2

Look into fishing line. It rests quite comfortably on spools, can be quite strong, is applied where weight is a concern, and is readily available (although I don't know anything about its stretch). A web search for "fishing line strength" turned up many hits offering many ways of selecting which type of line (you just have to ignore the what-type-...


2

Servo 1. Referring to your diagram, first consider the tilting part at the top. Imagine a line connecting its bearings. It will tilt (rotate) about that axis. The weight (force due to gravity) of the top part can be modeled as a single point, located at the Center of Gravity. The force, pointing straight down, tries to make the top part flop over -- it will ...


2

Most solar tracking rigs only move along one axis because the efficiency savings from moving along 2 doesn't make up for the energy losses of having 2 motors. If you're just doing this for fun, then you have questions to ask yourself: How heavy is the system that you're moving? Is it so heavy that a normal hobby servo couldn't handle it? Is this ...


1

The system in the paper is supposed to control an exoskeleton which will mimic the motions of the person inside, except bearing the weight of the backpack (and some of the person's weight, too). There is no traditional control input for servoing. Instead, to detect the person's intent, it seems to rely on how the person inside incrementally perturbs the ...


1

You use Forward Kinematics to calculate the end-effector pose of your robot/platform, given the joint angles. There are many different methods to calculate the Forward Kinematics, I remember using the Product of Exponentials method, which works well if you have a good visual model/description of your platform. You may use Geometric Methods and functions (...


1

It would be interesting if they would have these hard anodized, which would give the surface of the aluminum the same hardness as case-hardened steel. I agree though that the contact area is very small. I do not see the advantage of this over an undercut slot that captures a t-nut underneath, which would still give you the flexibility to tighten anywhere ...


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