Recent content by Parsifal1

I see, so that was the formula I mentioned then. Problem solved.

So the linear displacement of the rack is equal to the linear displacement of the gear? If so I should be able to use the formula I mentioned?

Does that have formulas to work out displacement?

So I couldn't use the formula s=r*angular displacement to work out the rotation of a rack and pinion gear?

Its a project. I don't know which type of gear I will be using yet, I just want to know what you would use for the radius in that formula in the case of a gear. Would you use the radius of gyration, using the outer and inner radius formula?

I want to find how far a gear from a rack and pinion will rotate from the displacement of the rack and the angle that it will have turned using: s=r*angular displacement. So what is the radius in this case?

I don't have any dimensions yet. Should I put an o ring in the gap between the outer and inner plate, then around the outer plate at the bottom, so water doesn't leek out?

Maybe I could make the gap between them bigger at the bottom to fit an O seal in, if its the case that this won't prevent the rotation.

Thanks. How would I hold it in place. I want the cylinders to overlap tightly, should I put the two cylinders on top of the seal, then fix it to them somehow?

I'm trying to make two metal cylinders which will overlap to act as a valve for the outer cylinder to rotate around the other. I need to be able to stop water from the reservoir around the outer cylinder from leaking down between the plates and into the gap for the gear which will give the...

Ah, I see if you do (q-3p)x^2 and multiply it out and the same with the other factorized terms, you get the terms you get when you'd first expand it out. I hadn't noticed that px^3+(q-3p)x^2... etc. was a cubic. I need to work on noticing things, I've found. :rolleyes:

What I don't get is how they factorized what you get from expanding: px^3+qx^2+rx-3px^2-3qx-3r. How do you get px^3+(q-3p)x^2+(r-3q)x-3r from that?

Homework Statement Expand the brackets to get a cubic containing the unknowns. This is an example in the textbook but I don't see how they've expanded the brackets to get their answer: (x-3)(px^2+qx+r)=px^3+(q-3p)x^2+(r-3q)x-3r Homework Equations (x-3)(px^2+qx+r) The Attempt at a Solution I...

Field service engineers do things like maintenance, repair, installation etc., as the name would imply. And a bachelors degree takes 3 years here (England).

What about a field service engineer? (I meant to say).