Matching V-belts in a set
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    Default Matching V-belts in a set

    One of my lathes, an Okuma LS, uses a set of 3 V-belts for the main drive. One of the belts shows possibly excessive wear. Must these be replaced as a matched set? Or is it enough that the 3 belts simply be all the same brand/model/size/perhaps age?

    Markings on one show: Dayco Super Blue Ribbon BP79.

    Thanks fellas. All comments welcome.

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    I was in the same boat when I had to replace the 3 belts on my lathe. I talked to the applications engineer at Gates and he said 'matched sets' is an outdated concept. All the belts will stretch to be the same size now. He said to put them on, tension the loosest belt until correct tension then run it for like 24 hours (I think he was thinking this was for like an air compressor). He said they will stretch to size. Even when they have a listing for a "set" they just throw however many off the shelf of the same size in a box.

    This was for the Gates Hi-Power II or something like that.

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    Quote Originally Posted by ezduzit View Post
    One of my lathes, an Okuma LS, uses a set of 3 V-belts for the main drive. One of the belts shows possibly excessive wear. Must these be replaced as a matched set? Or is it enough that the 3 belts simply be all the same brand/model/size/perhaps age?

    Markings on one show: Dayco Super Blue Ribbon BP79.

    Thanks fellas. All comments welcome.
    That's a "B" section Vee belt. You might get lucky if buying three new ones at the same go and have them come really close.

    Otherwise, they simply need independent idler/tensioners ELSE have shorter lives. Belt length doesn't set RPM. Pitch diameter of the sheaves do that.
    So long as THEY match in each "set"? All each belt does is take a longer or shorter route *in between* its turns at "wrap'.

    BFD. "B" belts are dirt-cheap, as little as $4.72 each for that code:

    D&D PowerDrive BP79 V Belt - Off Road Belts LLC

    If as/when the need is critical, tighter-tolerance "A" section belts are specified.

    Yes. It takes more OF them.
    Yes. They are far more expensive. Double triple, even more for higher-grade ones.

    BFD. Premium "A" section legacy Vee's run as a team last far longer. Typically four and more times as long. The pair of "A" section on a Monarch 10EE are run at about HALF their rated power transmission capability. Each. They typically fail from extreme old age and disintegration of the belt from oils and atmospheric antagonists, not from wear or mismatch.

    Less frequent downtime. So the premium belts may end up LOWER cost, not higher.
    Okuma would have matched the first set when your machine was brand-new, too.

    Designers made a choice, but "legacy" Vee belts are no longer high on the list for new goods of significant value in any case. PolyVee, MicroVee AKA "serpentine" work better. Synchronous does things neither can do.

    So now you have to JFDWT.

    Review the Gates "V80" service:

    https://ww2.gates.com/IF/facts/documents/Gf000194.pdf

    And/or buy all new, same brand and hoped-for production run. Change all each go.

    "Run what you got!"

    Make chips until NEXT renewal cries out "it is time!"

    Meanwhile "all comments?"

    OK. I'll play.

    Old guy, young wife rules apply:

    She: "I want that I want when I want it!"

    He: "You'll get what I got when I get it!"

    Budget and downtime thing, yah?

    T'was ever thus. TANSTAAFL.


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    Im sure they will tell you the belts will stretch and even out. Last time I tried to buy a matched set I was basically laughed at, out of the 3 I got 1 was really loose and still remains loose to this day. I started buying banded vbelts so if you need 3 matched, it all comes as 1 belt. They are a little more spendy but have worked great for me on a few projects.cogged_wedge_banded_cab23c10-e24a-4ade-89c9-fdd2ff8638d5_1024x1024.jpg

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    Quote Originally Posted by Blazemaster View Post
    Im sure they will tell you the belts will stretch and even out. Last time I tried to buy a matched set I was basically laughed at, out of the 3 I got 1 was really loose and still remains loose to this day. I started buying banded vbelts so if you need 3 matched, it all comes as 1 belt. They are a little more spendy but have worked great for me on a few projects.cogged_wedge_banded_cab23c10-e24a-4ade-89c9-fdd2ff8638d5_1024x1024.jpg
    Works OK IF the pulley spacing fits..

    FWIW_only-academic..

    PolyVee/MicroVee are only made as "banded". About four feet wide worth.

    So sayeth their makers, anyway. I was off buying chile peppers that day..



    THEN they go off to slitters that slice 'em to the rib-count wanted @ "n" fractional HP per rib, each style range.

    Shallower grooves lose less power than tall sidewall legacy Vee, bend around smaller diameters, need simpler pulley structures off the shallower depths.

    It has gotten HARD to argue with the brazillions of motor vehicles as have adopted them as "serpentine" belts over multiples of legacy Vee belts, lo these many years and counting.

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    Thanks fellas. I will just order 3 of the same brand.

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    Quote Originally Posted by ezduzit View Post
    Thanks fellas. I will just order 3 of the same brand.
    Gates B79 Hi-Power II Belts – Texas Belting and Supply


    Zoro is about a dollar more. Advance Auto or Amazon about 8 dollars more.

    No idea what the Kalifornicyah SSR import duty nor conversion to Bitcoin, weight in Cannabis Sativa, recyclable needles, Napa Valley whine, nor Renminbi might be.

    Weird from of bar-turd economy those feudal SSR's run...


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    We had 3 and 4 belt combos that were made as a unit


    Dave

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    King size serpentine belt!



    Quote Originally Posted by Blazemaster View Post
    Im sure they will tell you the belts will stretch and even out. Last time I tried to buy a matched set I was basically laughed at, out of the 3 I got 1 was really loose and still remains loose to this day. I started buying banded vbelts so if you need 3 matched, it all comes as 1 belt. They are a little more spendy but have worked great for me on a few projects.cogged_wedge_banded_cab23c10-e24a-4ade-89c9-fdd2ff8638d5_1024x1024.jpg

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    Quote Originally Posted by winger View Post
    We had 3 and 4 belt combos that were made as a unit


    Dave
    See post 2
    Then did you check the grooves of the poelies were the same???

    Peter

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    Quote Originally Posted by Blazemaster View Post
    Im sure they will tell you the belts will stretch and even out. Last time I tried to buy a matched set I was basically laughed at, out of the 3 I got 1 was really loose and still remains loose to this day. I started buying banded vbelts so if you need 3 matched, it all comes as 1 belt. They are a little more spendy but have worked great for me on a few projects.cogged_wedge_banded_cab23c10-e24a-4ade-89c9-fdd2ff8638d5_1024x1024.jpg

    What is your preferred place for getting those? My Daewoo needs all new belts... all 12 of them. I'm sure a banded 8x5L is gonna cost a fortune, but so will individual.

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    Quote Originally Posted by Peter from Holland View Post
    See post 2
    Then did you check the grooves of the poelies were the same???

    Peter
    Didn't really matter, it was what the machines came with. About a 12 dia driving a 60" flywheel.
    Dave

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    Quote Originally Posted by winger View Post
    Didn't really matter, it was what the machines came with. About a 12 dia driving a 60" flywheel.
    Dave

    The bigger the drive the less the absolute differences in lenght matter
    Peter

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    Quote Originally Posted by Jaxian View Post
    I was in the same boat when I had to replace the 3 belts on my lathe. I talked to the applications engineer at Gates and he said 'matched sets' is an outdated concept. All the belts will stretch to be the same size now. He said to put them on, tension the loosest belt until correct tension then run it for like 24 hours (I think he was thinking this was for like an air compressor). He said they will stretch to size. Even when they have a listing for a "set" they just throw however many off the shelf of the same size in a box.

    This was for the Gates Hi-Power II or something like that.
    That was my experience when I went to replace my 4 belt set on my Colchester. I guess I'm just old school.

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    I also have a Okuma LS 540x1500. I ordered a matched set for it about 15 years ago from Grainger. They were a truly matched set back then. Still going strong with those belts. I think it was about $60-$75 for the matched set.

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