Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Bearing failure rating? Simple rev counter?

  1. Nov 5, 2005 #1
    Firstly I would like to point out I have absolutely no idea what im doing and will most likely be blind or dead by tomorrow. But anyway.

    I've finally finished me first turbo jet engine (from scratch I would like to add and designed myself and dodgy as I am pretty convinced that it wont explode (mainly because its about a hundred times stronger than it needs to be) but I do expect it to either disintegrate or have bearings fail. I have used roller bearings, which was a stupid idea I know but it saved me a lot of time. What I would like to know is how I can determine roughly what speed a roller bearing will fail at excluding sideways force and heat etc. I have a formula for the failure rating when a certain sized bearing is under a sideways force but I cant find one for the maximum revs they can handle.

    There must be a formula where you can use the ball size, number of balls, outside diameter, inside diameter width etc.

    Also I would like to have a simple way of working out the number of revs its doing. Maybe using a strobe light and adjusting the frequency until the impeller stops moving? Then you could use that frequency someway. Just a thought. (probably stupid but hay im at high school where making a fire poker in engineering is classed as complicated)

    The thing is I don’t what it disintegrating and blinding a few fellow class mate. I suppose I would get on the news if it exploded and kill a few people (I shouldn’t say that, sorry)

    I know im only at high school and you guys are all probably either 4th year mechanical engineering students or actual engineers but I hope to be a 4th year mechanical engineering student one day so give use a break)

    So if you have any ideas that’d be great. Anything really.

    I posted this in general engineering but i though it would be more appropriate here.

    Cheers
     
    Last edited: Nov 5, 2005
  2. jcsd
  3. Nov 5, 2005 #2
    Bearings have data sheets. The max RPM, load limits and expected failure life are quoted in said data sheets.
     
  4. Nov 5, 2005 #3

    FredGarvin

    User Avatar
    Science Advisor

    See my response in the General Engineeering Topic. Please don't double post.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Bearing failure rating? Simple rev counter?
  1. Bearing cage failure (Replies: 16)

  2. Truss with counters? (Replies: 7)

  3. Bearing failure (Replies: 4)

Loading...