Page 2 of 2 FirstFirst 12
Results 14 to 26 of 26
  1. #14
    Join Date
    Mar 2013
    Location
    DeLand, Florida
    Posts
    33
    Post Likes
    Thread Starter
    American or China...
    I need to look into who makes the ones I use.

  2. #15
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    25,634
    Post Likes
    Quote Originally Posted by Capt Wolf View Post
    Good read on the Browning site.

    "Can you explain why worn sheaves (v-belt pulleys) contribute to energy efficiency loss?"

    I think all of us need to read this, short read. I'm replacing a few VP pulleys now and finding out that I should have started earlier on some of them!!
    .
    Attached Images Attached Images

  3. #16
    Join Date
    Jun 2017
    Posts
    1
    Post Likes
    Aligning and dialing out the sheaves is a must in my PM's.

  4. #17
    Join Date
    Jun 2017
    Location
    Md
    Posts
    17
    Post Likes
    Quote Originally Posted by timebuilder View Post
    The truth is, it depends on the client.

    I have one site where I made an initial PM inspection and wrote up all 15 belts and pulleys.

    A year later, they approved half of them.

    So, if I know that the customer will act, I act. If the customer will ignore, I go on to the next unit.
    I have run into this on most of our regular customers over the past couple years. I can talk about it until I'm blue in the face, but nothing gets done until something breaks. There has been a shift for whatever reason in the maintenance spending with a lot of companies. I now mention it at the beginning of each fiscal year, and that's about it unless something breaks.

  5. #18
    Join Date
    Aug 2019
    Posts
    6
    Post Likes
    In general, I'll replace sheaves maybe every 5th belt change....sometimes not even then. I'll put a guage on it and make the call, well, I'll put a guage on it if I feel wear with a finger, and use the guage to see how much wear there is.
    Better than OK alignment (normally use a Laser/reflector), and belt tension makes them last a lot longer

  6. #19
    Join Date
    Mar 2015
    Location
    Medford, N.Y.
    Posts
    6,090
    Post Likes
    At a Browning belt/pulley/sheave class we were told that 1 turn of the drive pulley changes the CFM by 5%.

    Norm Christopherson has 2 articles on belts that I know of.
    1- Belt Length Changes, along w/ formulas.
    2-Arc of Contact & Avoiding Slippage.

    Both a Good Read!

  7. #20
    Join Date
    Apr 2003
    Location
    St. Louis
    Posts
    1,269
    Post Likes
    You want to double or triple belt life and years on pullies. VFD and if the manufacturer of equipment would design the drive system not at the motor hp but 25% bigger. And all drive designs look at pulley diameters, center to center and belt speed. If you leave a paper tag with a wire tied to the motor with when the belts were changed wouldn't make someones life easier.

  8. #21
    Join Date
    Mar 2015
    Location
    Medford, N.Y.
    Posts
    6,090
    Post Likes
    Quote Originally Posted by IronArcher View Post
    In general, I'll replace sheaves maybe every 5th belt change....sometimes not even then. I'll put a guage on it and make the call, well, I'll put a guage on it if I feel wear with a finger, and use the guage to see how much wear there is.
    Better than OK alignment (normally use a Laser/reflector), and belt tension makes them last a lot longer
    I find that awful hard to believe that a pulley gets that damaged that it "needs" to be replaced after just 5 belt changes.

  9. #22
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    6,861
    Post Likes
    Quote Originally Posted by TechmanTerry View Post
    I find that awful hard to believe that a pulley gets that damaged that it "needs" to be replaced after just 5 belt changes.
    i have seen sheaves ruined after 1 belt change. but if you are aligning and tensioning properly, then after 5 belt changes, that may be about right. of course, that is assuming that you aren't changing the belt every year...only when the belt is worn out. which could be 5 years or more between belt changes.
    "Right" is not the same as "Wise".

    Don't step on my favorite part of the Constitution just to point out your favorite part.

  10. #23
    Join Date
    Aug 2019
    Posts
    6
    Post Likes
    Quote Originally Posted by jayguy View Post
    i have seen sheaves ruined after 1 belt change. but if you are aligning and tensioning properly, then after 5 belt changes, that may be about right. of course, that is assuming that you aren't changing the belt every year...only when the belt is worn out. which could be 5 years or more between belt changes.
    Exactly. Most of my belts are running 4-7 years+...save for a few timing belts that I think they specked out too small)

  11. #24
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    32,052
    Post Likes
    Quote Originally Posted by IronArcher View Post
    In general, I'll replace sheaves maybe every 5th belt change....sometimes not even then. I'll put a guage on it and make the call, well, I'll put a guage on it if I feel wear with a finger, and use the guage to see how much wear there is.
    Better than OK alignment (normally use a Laser/reflector), and belt tension makes them last a lot longer

    PLEASE do not post in 2 year old threads.

    Thank you.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

    AOP Forum Rules:







  12. #25
    Join Date
    Mar 2015
    Location
    Medford, N.Y.
    Posts
    6,090
    Post Likes
    Quote Originally Posted by IronArcher View Post
    Exactly. Most of my belts are running 4-7 years+...save for a few timing belts that I think they specked out too small)
    I'll concede to that!

  13. #26
    Join Date
    Sep 2016
    Posts
    11
    Post Likes
    Thanks for the share. Great read!

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •