Ive been having a lot of trouble with the drive belt that goes from the motor to the
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  1. #1
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    Default Ive been having a lot of trouble with the drive belt that goes from the motor to the



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    Last edited by loggerhogger; 07-11-2017 at 12:09 PM. Reason: Messed up on body of post

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    Is it slipping ???

    You don't say what the problem is.

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    I know i know. Tried to edit, but it wouldn't let me. Yes it was slipping, and since i have a lot od leather to make belts from, and im just a fan of the old leather belt, i didnt feel like using an old serp belt. So i got into my odds and ends stock and made a tensioner. The roller has a pressed in bronze insert for a bearing.

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    Quote Originally Posted by loggerhogger View Post
    I know i know. Tried to edit, but it wouldn't let me. Yes it was slipping, and since i have a lot od leather to make belts from, and im just a fan of the old leather belt, i didnt feel like using an old serp belt. So i got into my odds and ends stock and made a tensioner. The roller has a pressed in bronze insert for a bearing.

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    I would expect it to slip.

    I can't help too much, my counter shaft has a v-belt on it to the motor.

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    Yes, I've never seen a flat belt for the motor to counter shaft on a South Bend. Usually V belt or silent chain. The motor pulley is too small for the flat belt so it slips.

    The V belt runs fine on the larger flat sheave as South Bend intended.

    100_9080.jpg

    John

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    Should be a V-belt pulley on the motor, driving a flat pulley on the countershaft. If you are set on keeping the flat belt, you have the idler pulley on the wrong side (should be on the slack side) and that spring should be replaced with one significantly stiffer.

    allan

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    Quote Originally Posted by comstockfriend View Post
    Yes, I've never seen a flat belt for the motor to counter shaft on a South Bend. Usually V belt or silent chain. The motor pulley is too small for the flat belt so it slips.

    The V belt runs fine on the larger flat sheave as South Bend intended.

    100_9080.jpg

    John
    As Kitno said, but I would go further and scrap the spring tensioner altogether and make up a fixed (adjustable) bracket for the tension roller to keep tension consistent. "Think" car timing belt or even the SB cone pulley tensioner itself.

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    The V to flat drive system used on those old SBLs works well. I have had the same belt on mine for many years. The flat belt going from the counter shaft to the headstock will slip,but the V belt doesn't stop. I don't keep either of them real tight.


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