Search results for query: *

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

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...

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?

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...

I wonder what might be the difference in manufacturing cost between the following 2 roller chains. The two chains are identical in everything except the second chain is 30% wider than the first. So they both have the same chain plates, same construction, but the roller, bushing, and pin on the...

I'm interesting to knowing more about what determines the manufacturing cost of mechanical components. Common sense tells that a part will get more expensive if: 1. the material is more expensive 2. the parts is larger 3. the tolerance is smaller. But they don't really tell me how much more...

The chain as we know it, needs a lot of lubrication. Where is the lubrication most critical/important? the pin/bushing interface? or the roller/bushing interface? I would think the lubrication at the pin/bushing joint is a lot more important than the roller/bushing interface. It seems...

I wonder if the wear rate of components such as gears, chains, bearings are directly related to the load on them? For example, if I run 2 identical gear pairs at the same rpm, but one pair is under a load of only 30 lb, but the other pair is under a heavy load of say, 500 lb. I would think the...

Got a question on ball bearings. It seems there are still sliding friction involved in a ball bearing, even if we assume the ball rollers have a rolling friction of zero (perfect rolling with slipping). I think there must be some kind of friction between the balls (or needles rollers) and the...

Are there any applications where it's benefical to have the drive ratio be as exact as possible? (Other than machining).

Can you guys check this out? http://www.wpcorp.com.au/html/business/smart_ways_to_save/sees_variable_ speed_drives.html It talks about variable speed drive (VSD) which seems to be commonly used in industrial motor application. How does that work? Is that the same kind of system used on the...

Does anyone know the efficiency of a spur type bevel gear mesh? Thanks

It's generally conceived that roller chain typically have an efficiency of around 98%. Out of all the different types of losses, does anyone know which one is the most significant? There are primarily: 1. Sprocket tooth/chain sliding friction (engagement/disengagement) loss 2. Chain segment...