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  • Users: GregPerry
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  1. GregPerry

    Asset Management Standards

    I am looking for specifications or standards on the following asset management items. 1. Equipment functional analysis, criticality analysis, FMECA's. 2. Spares criticality analysis and stock holding levels. Greg
  2. GregPerry

    Tempered Martensite

    According to literature the following steel: BS 970 817M40 Condition 'T' should have a final microstructure consisting of tempered marensite. We have had a fatigue failure on a solid shaft and testing revealed the following: Chemical properties all within specification Mechanical Properties...
  3. GregPerry

    Fatigue failure of low stressed shaft

    Ted, We have inmplemented a improved material specification based on some of the information supplied in this forum and believe this will be suffiecent as the fatigue calculations show the stresses are acceptable. We included: 1. A high temperature normalise, not done previously 2. A...
  4. GregPerry

    Stress concentration due to taper locking element

    Hi Does anyone have any reference to what stress concentration factor (Kt) I can apply to a taper locking element fitted to a solid shaft? I need actual values not assumptions please if that is possible. Thanks Greg
  5. GregPerry

    Stress Consentration due to taper locking element

    Hi Does anyone have any reference to what stress concentration factor (Kt) I can apply to a taper locking element fitted to a solid shaft? I need actual values not assumptions please if that is possible. Thanks Greg
  6. GregPerry

    Extracting Oils from Organic Material

    Thanks for all the input guys. With steam distillation would I just put the material in some water bring it to the boil and collect the vapour. Then seperate the oil from the water? Is it that simple? THanks
  7. GregPerry

    Extracting Oils from Organic Material

    I would like to know how to extract oils from organic material. I would like to set up a little system at home where I would be able to extract oils from leaves, flowers, etc... I would appreciate some ideas on what process would be involved. Thanks
  8. GregPerry

    Seperating the cream from the milk

    Anyone know how a cream seperator works? I have a small manual one and would like to know the theory behind its operation. Thanks
  9. GregPerry

    coil springs sideways motion

    Why not use a beam spring? The theory is easily available and it would be doing what it is designed for, as opposed to using a coil spring as a cantilever.
  10. GregPerry

    coil springs sideways motion

    Why not use a beam spring? The theory is easily available and it would be doing what it is designed for.
  11. GregPerry

    Worm Drive material selction

    In the valve industry there are a lot of worm boxes used. The ones I have seen have brass or cast iron worms and BS 970 709M40 for the worms. The 709M40 is hardened and tempered. It is a very common material.
  12. GregPerry

    Oil Cleanliness in Industrial Gearboxes

    ICW, Yes please. Send it to greg.perry@hansen.co.za Thank you.
  13. GregPerry

    care about shaft misalignment...?

    It is said that misallignemt can cause 5-10% power loss, or so I have heard. Ensure your machine and drive are correctly alligned. Have a look at Rexnords 'Magnalink' it is a noncontact coupling that transmits the torque via magnetic force. Greg
  14. GregPerry

    more friction on flexible coupling caused by shaft misalignment

    The best solution is to make sure your machine and drive are correctly alligned then you will have minimal coupling wear. Have you seen the new magnetic type of couplings. There is no physical contact at all, all the power is transmitted via magnetic force. They are supplied by Rexnord and are...
  15. GregPerry

    Threaded Connection

    Chris, The smalles adjustment I think will be obtained useing RH-LH threads. The threads must be of a different pitch, for example. RH - 2mm pitch LH - 1mm pitch One rotation will result in the RH screw going out 2mm and the LH screw going in 1mm resulting in a total movement of 1mm. By...
  16. GregPerry

    Geneva Gears-Need design info

    I have a book i think it is called 'mechanisims source book'. Have a look at amazon.com they have it.
  17. GregPerry

    Plastic gear like this

    your link does not work
  18. GregPerry

    high noise level in a parallel shaft speed multiplier

    Check with the gearbox manufacturer what noise level is normal. If yours is abnormal why not do some vibration analysis and phase analyis to pinpoint any possible problems.
  19. GregPerry

    Acme Thread Wiper

    Leonard, Why dont you machine a nut out of nylon or some other plastic (or even brass) cut it in half down the axis. Hold the half nut agains the threaded rod with some sort of spring mechanisim. As the dirt gets to the nut it will run up agains the axial face. Make it a few threads long so it...
  20. GregPerry

    Cross refernce for materials

    Is there a web site where I can cross reference material specifications: e.g.: If I enter werkstoff no. 1.7225 I can get a list of all the possible equivalents. Greg

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