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  1. tollie

    preload dimension?

    I have two NTN 7218bg bearings that I want to space .750 apart.Can anyone tell me proper length of spacers to set the preload on the bearings? Tollie
  2. tollie

    Heat transfer times ?

    I'm not sure of the size of the holes but they might be .005 .Screens are made on a mandral then the holes are etched into the screen.This is a bought item for us. The holes in the shell the screen goes on, there maybe 10's of thousands .093 holes depending on the size of the roll. There is one...
  3. tollie

    Heat transfer times ?

    The product is a vacuum roll. The nickel screen would be a cover on the roll. The in side tube would be a 5/8 wall tube 12.75 dia.This has many holes drilled around the O,D, that the vacuum is pulled thru. The tube is bored ,honed and O.D. ground.The roll controls web tenison on converting...
  4. tollie

    Heat transfer times ?

    Sreid Yes,On a hot humid day,lots of frost builds up.We have wrapped the shell in shrink wrap to prevent this build up.Removing the wrap just before the attempting to install the screen. Your plan of using a tube to support the screen and heat it is a good one. This idea maybe of some help...
  5. tollie

    Heat transfer times ?

    Timbones The nickel cylinder ends up a srink fit on the steel cylinder.The steel being.005-.008 bigger than the I.d. of the nickel sleeve.Out side the box is good ,Cause I been trapped in it with no way out.I have had some sucess with another method.We buy the screen measure the I.D.on a gauge...
  6. tollie

    Heat transfer times ?

    MintJulep Can you elaborate on your idea a litte more.?Would you cool the Cylinder before the bath? How hot of a bath do you think will be needed.?? We did rap the screen in a hotwater blanket once.This only accomplished a mess of ice on the cylinder though. Tollie
  7. tollie

    Heat transfer times ?

    Irstuff This is true ,timing would be critical, the operation would have to take place quickly.I have in the past, had bearing journals that were shrunk on a tube with no welding done,Much to my dismay wrong location.By putting dry ice in the tube and heating the journal,I was able to move to...
  8. tollie

    Heat transfer times ?

    Panduru, As a matter of fact ,the next attempt my fearless leaders want to try is a blanket.I can not see enought heat being transfered to the portion of the screen that comes into contact shell to keep the screen dia. expanded with a blanket.The shell becomes a heat sink when the screen comes...
  9. tollie

    Heat transfer times ?

    The selling point of the product is that it is a seamless very smooth surface.The holes in the screen are very tiny.The screens are used in the printing industry for printing.
  10. tollie

    Heat transfer times ?

    My thoughts are to supend the steel shell with the dry ice in it .Fixture the screen to hold it square to the shell in side a movable oven . Heat the screen as it is slid over the shell. It's lenght of time and heat concentration that I'm not sure of. The screen at only .005 thick has no mass...
  11. tollie

    Heat transfer times ?

    The shell or steel cylinder being cooled with dry ice should have the dia. reduced by about .012-.015.Without heating the screen the cold is transferd very quickly, srinking the screen.So,Is it possible to calulate how much heat is needed to maintain the dia. of the screen?
  12. tollie

    Heat transfer times ?

    The company I work for has been working on the delvopment of this product for sometime now.I have been thru many experiments with this, that have lacked good engeering basis.No school projects here, just hard knocks
  13. tollie

    Heat transfer times ?

    The nickel sleeve is a etched screen that will have a vacuum pulled thur it. It comes with a .005 tol.on the I.D.
  14. tollie

    Heat transfer times ?

    The problem :To get .005 thick nickel cylinder 12.75 dia.X 80" long on a Steel cylinder .625 thick ,O.D.being.005-.008 bigger than the I.D. of the Nickel cylinder. Steel cylinder has been cooled with dry ice.Constant heat being applied to the nickle sleeve. What is the possible time span to...

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