Catalyst
  • Member for 4 years, 3 months
  • Last seen more than 2 years ago
  • Boston, MA, United States
How are the modern hydraulic cylinders very precisely controlled?
1 votes

Typical Hydraulic Servo Setup (as used in structural testing): The power source is usually a pump (e.g. a swash-plate pump) arranged to provide (up to a rated flow rate) at ~constant pressure. ...

View answer
What kind of mechanism can be used to rotate a part in 180 degrees (Ψ (yaw)) and 30degrees in 𝜃 (pitch) direction?
1 votes

Gimbals are the classic solution for this: https://en.wikipedia.org/wiki/Gimbal And if you don't need any roll, you can omit one of the gimbal rings, in which case a pan/tilt mechanism is sufficient (...

View answer
What are the different methods to join 2 parts so that one can rotate 180 degrees around the other?
1 votes

Perhaps a "turntable bearing" also called a "lazy susan" bearing. Something like this one: https://www.amazon.com/Square-Inch-Susan-Turntable-Bearing/dp/B00ZSQSWTM

View answer
What kind of splines should be used when planning roads?
1 votes

Clothoid? I recall hearing that some roadway curves are designed using the Clothoid Spiral AKA the Spiral of Cornu AKA https://en.wikipedia.org/wiki/Euler_spiral in which the (radius of) curvature ...

View answer
How would you seal a hole in an HDPE container that's in -20C environment
1 votes

I suggest buying extra caps/stoppers and drill a close-fitting hole. If the caps (and your probe/wires can take it), perhaps use some hot-melt glue for a mechanical seal.

View answer
What happened to the projectile in Hypervelocity Impact tests?
0 votes

In some tests, the Livermore crew fired their projectiles into piles of sandbags, as documented here: https://crgis.ndc.nasa.gov/crgis/images/8/85/TRP00308.pdf I seem to recall reading that in ...

View answer
Kinetic energy of a balloon
0 votes

There are two components to the total energy in the balloon: 1) The P*V work done on the air (or whatever fluid you've filled it with) and 2) the stress*strain work done on the rubber as the ...

View answer
Material selection for weight scale
0 votes

1) I've used several brands of FSRs, including FlexiForce and you're very unlikely to get results usable in trade; their responses to pressure vary with temperature (because, I suspect, the stiffness ...

View answer
Material for filling small air leaks
0 votes

You might try https://en.wikipedia.org/wiki/Polycaprolactone It softens at hot-water temperatures and is safe to handle. (You'll probably need to heat it a bit above that to get to fully liquid.) FDA ...

View answer
How does an air-bearing "pre-load" work?
0 votes

I suspect that by 'pre-load' they mean putting a flow restriction between the fluid pressure supply and the bearing. Doing this is essentially adding a (large) fluidic resistor between the pressure ...

View answer
Material that holds shape when stretched
0 votes

Ductile and Plastic Material for Making Parts? Suggest you try Polycaprolactone. If you're looking for a highly ductile/purely plastic material to form into a shape -- one that's easy to work with at ...

View answer
corrosion in electrical parts and wiring
0 votes

Conformal Coatings are your Friend! I suggest you look into "conformal coatings" used to protect electrical and/or electronic components from corrosion. These coatings are commonly used on Naval ...

View answer