Please, correct my error if there are any.
Since you are so curious, I'm a chemical engineering student who likes to tinker wih mechanical things during free time.
What are some of the factors that determines the strength/load of a needle bearing?
Factors such as number of rollers, diameter of rollers, diameter of inner race and outer race.
Does the strength increase with the number of rollers? or the diameter of the rollers? or both.
Thanks
Actually, I don't know how you guys did your pressure calculation.
But 600 lb/3mm^2 = (2670N)/(0.000009 m^2) = 296666666 Pa.
That's 43000 PSI.
I can make the area twice as big with no problem. S0 then the stress would be 21000 PSI. I think even some plastics can withstand that compressive...
Let's say it's a chain drive with a ratio of 3:1.
It's often said that the sprockets are cheap and chains are expensive.
For sprockets, the smaller one will be cheaper.
The idler sprocket will be about the same size as the small driving sprocket but it's not really under any load, therefore...
I don't see how the rubber would get destroyed.
By yielding strength you mean something will get deformed. But deformation is OKAY. The rubber might be crushed, but it's still there. It cannnot vaporize. Deformation is not a problem, just as long as there are some "material" to cushion the...
I'm designing a device where two pieces or metal come pressing together
at a speed of 0.5m/s. I need to insulate the metal contact area with
some kind of material to dissipate the noise that would be created by
metal-metal contact. The contact area is 3mm^2.
After the two pieces of metal comes...
Back to the original topic. I'm still talking about the manufacturing cost. (not the sales price)
How much would adding a small idler sprocket add to the cost of a chain drive?
Thanks
But those hours can be extended almost indefinately if there are rebuilds (repeatedly)?
I do ask a lot of questions since I'm curious but also because I need the answers.
While the needle bearing joints can extend the life of the chain drammatically, it'll do so at a very expensive price. For example, it might be 3 times as expensive as a regular chain.
That might not be cost effective if the machine only last twice as long as a normal chain. Normal chains can...
My guess is most mechanical components are not designed to have infinite fatigue life even thought it's possible, due to size, cost, and necessity reasons.
So how long can a bearing usually last?
I know there is something called a L10 life where 10% of the bearing fails. That's usually 100 million revolutions. Right?
And the "average" life of a bearing is usually 5 times the L10, which is 500 million revolutions.
So if I know the rpm, I can...
Must the rollers in a bearing be grounded to fine tolerance?
What will happen if a "rough" roller gets used in order to save cost?
Will the wear out quickly?
What about the "endurance limit". Some steel alloys have a limit where if the load is below it, the fatigue life is infinite.
That means it's theoretically possible to make mechanical components with infinite fatigue life.
Is it often done in real life?
Thanks
I'd like to find out more about the fatigue-strain relationship of mechanical component.
Is it a linear relationship?
For example, if I increase the width of gear or chain, did I just doubled its fatigue life?
I remember faintly that it's not a linear relationship, but more of a curve...
