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  1. #1
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    Does anyone know what the correct angle is for a v-belt pulley? I'm assuming the angle is standard, and that width and depth are the only variables for the different cross sections for belts. Is this the sort of thing tha would be in a machinery's handbook?

  2. #2
    mobile_bob is offline Stainless
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    i just went thru this with a belt engineer at goodyear and one at browning, and guess what..

    no definitive answer, but both concur that it appears to them that all v belts share the same angle. only depth and width are the variables

    i promptly forgot the angle that we came up with but i think it was 37 degrees

    if anyone has a better answer i too would like to know and the source of the info.

    bob gayle

  3. #3
    mobile_bob is offline Stainless
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    also i might add i checked on the following sections

    letter sizes such as A, B, C

    automotive such as gates 7000, 9000 series

    and power belts, such as 5L etc

    all have the same angle

    hope this helps

    bob g

  4. #4
    toryranger is offline Junior Member
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    Per the Machiners's Handbook, 20th edition:
    Light duty V-belt Sheeve dimentions
    2L
    Effective Outside Diameter in inchs
    Under 1.5-- 32 deg. width at full dia .240
    1.5-1.99-- 34 deg. """"""""""""""""" .243
    2.0-2.5-- 36 deg. """"""""""""""""" .246
    over 2.5-- 38 deg. """"""""""""""""" .250
    depth o f groove .250

    3L
    Effective Outside Diameter in inchs
    Under 2.2-- 32deg. width at full dia .360
    2.2-3.19-- 34 deg. """"""""""""""""" .364
    3.2-4.2-- 36 deg. """"""""""""""""" .368
    over 4.2--38 deg. """"""""""""""""" .372
    depth of groove .406

    4L
    Effective Outside Diameter in inchs
    Under 2.65-- 30 deg. width at full dia .485
    2.65-3.24-- 32 deg. """"""""""""""""" .490
    3.25-5.65-- 34 deg. """"""""""""""""" .494
    over 5.65-- 38 deg. """"""""""""""""" .503
    depth of groove .490

    5L
    Effective Outside Diameter in inchs
    Under 3.95-- 30 deg. width at full dia .624
    3.95-4.94-- 32 deg. """"""""""""""""" .630
    4.95-7.35-- 34 deg. """"""""""""""""" .637
    Over 7.35-- 38 deg. """"""""""""""""" .650
    Depth of groove .580

    groove angle is included angle

    Smitty

  5. #5
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    Interesting that belt engineers couldn't come up with a defininte answer. I just had a similar SNAFU regarding connecting rod orientation in Benz engine and Benz engineers... they finally took apart a new engine from Germany to get the answer! Anyway, thank you Smitty, I just printed your info, and will tack it on my wall next to my tap drill chart. However, I now have a related question: What relation to sizes such as "5L" have to sizes such as "B"? When I bought a belt for the drive on my lathe, I asked for a 5L, as informed by someone on this site. The counterman said they don't carry 5L, but a "B" section belt is the same thing. Works fine in the lathe, so I assume that's true. What's the deal with this?

  6. #6
    peterh5322's Avatar
    peterh5322 is offline Diamond
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    "What relation to sizes such as "5L" have to sizes such as "B"? When I bought a belt for the drive on my lathe, I asked for a 5L, as informed by someone on this site. The counterman said they don't carry 5L, but a "B" section belt is the same thing. Works fine in the lathe, so I assume that's true. What's the deal with this?"

    4L is equivalent to A/AX (with exceptions), and
    5L is equivalent to B/BX (with exceptions), etcetera.

    However, the L suffix indicates light duty, and not matched as to length, whereas the A/B prefix, etcetera, indicates heavy duty, and matched as to length, according to the RMA (Rubber Manufacturer's Association) standards for "ganged" belts.

    (There is no heavy duty belt which corresponds to a 3L, which is quite popular in early Hardinge Brothers products).

    However, if you do need matched lengths of 3L, 4L or 5L belts, and RMA belts (A/AX, B/BX) are not an option, be aware that belts are cut from a master belt, and the master belt number, and the position from within that master belt which an L belt was cut are encoded on the edge of the belt, near the manufacturer's logo.

    If you need three matched length 3L belts, as for a Hardinge TL or TM/UM, you may notice that matched sets of Browning "Matchmaker" belts, the HB OEM belt, are no longer available.

    However, by carefully selecting from retail 3L belts of the same manufacturer and "trade size", and matching the master belt and position codes, you can obtain a pretty well matched set.

  7. #7
    toryranger is offline Junior Member
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    From the Machinery's Handbook:
    Table 7
    Standard Multiple V-belt Dimentions
    A) width= 1/2
    depth= 5/16

    B) width= 21/32
    depth= 13/32

    C) width= 7/8
    depth= 17/32

    D) width= 1 1/4
    depth= 3/4

    E) width= 1 1/2
    depth= 29/32

    FWIW the section in the Machinery"s Handbook that I have has 17 pages on v-belts and sheaves (pullys). The book is a 1975 printing so things may have changed.
    Smitty

  8. #8
    Dualkit is offline Diamond
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    I make custom pulleys mostly for serpentine
    automobile belts, but I have made a few v-belt
    pulleys as per sample as people want smaller
    or larger dia ones, the average angle when checked on the ones that came off cars was
    38 degrees included.

  9. #9
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    Thanks again for the info. Very glad to know about matching lengths; I always thought you had to buy a matched pair, but I gather 2 individual "A" or "B" section belts off the shelf (of the same length) would be matching length. Gotta get me a machinery's handbook!

  10. #10
    dazz is offline Hot Rolled
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    Hi

    This is an old thread but useful info is here: Vee belts / V belts

    Dazz

  11. #11
    Sheraton2 is offline Aluminum
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    Default article

    this article will help you ..MIKE

    http://www.green-trust.org/junkyardp...eltPulleys.pdf

  12. #12
    Mike72's Avatar
    Mike72 is offline Hot Rolled
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    My 13 in SB double belt motor pulley is 28 degrees with a belt spacing of .587. Try finding that in Machinery's Handbook.

  13. #13
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    Cool

    30-42 degrees depending on the size of belt and the pulley dia. The larger dia the pulley the more degree on the angle. I have some pics but i won't post them..Bob
    AUDEL Millwrights and Mechanics Guide 4th edition
    Bob Wright Metal Master Fab
    Salem, Ohio Birthplace of the Silver and Deming Drill, all others are copies.

  14. #14
    autofrite is offline Hot Rolled
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    matched belts used to come tagged in pairs.
    goodyear for example now claim all the belts are matched.
    i prefer to find belts that have a close batch number.
    belts run together should be run a little loose with little load for a few minutes,then re-adjusted.
    4L and 5L belts are measured on the outside circumferance,A and B series are sized by pitch diameter.

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