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Author Topic: Correct Drivebelt Tension  (Read 823 times)

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Offline Rougespear

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Correct Drivebelt Tension
« on: February 11, 2018, 01:14:53 PM »
Any thoughts on determining the correct drivebelt tension on the sawmill?  I'm wondering if my drivebelt is slipping some and causing the dipping and diving.  I do not have one of those "belt tension" gauges... Thanks!
Custom built Cook's-style hydraulic bandmill.

Offline slider

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Re: Correct Drivebelt Tension
« Reply #1 on: February 11, 2018, 01:24:35 PM »
I would get the gauge and find the specs for your engine . Crank shafts are not cheap.
al glenn

Offline Rougespear

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Re: Correct Drivebelt Tension
« Reply #2 on: February 11, 2018, 01:30:50 PM »
Engine is a 1970s Wisconsin with an 1 7/16" shaft - I don't think max belt tension was every spec'd for this old engines.
Custom built Cook's-style hydraulic bandmill.

Offline Kbeitz

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Re: Correct Drivebelt Tension
« Reply #3 on: February 11, 2018, 03:31:48 PM »
Sorry... I forgot this was two parts. I made it all in to one picture.

 

 
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Offline ladylake

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Re: Correct Drivebelt Tension
« Reply #4 on: February 11, 2018, 04:06:30 PM »
   

 With how many # of pressure.  Steve
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Offline Kbeitz

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Re: Correct Drivebelt Tension
« Reply #5 on: February 11, 2018, 04:36:26 PM »
   

 With how many # of pressure.  Steve

I fixed it... Go back up and look again.
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Online Southside logger

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Re: Correct Drivebelt Tension
« Reply #6 on: February 11, 2018, 04:46:48 PM »
Would that same chart apply to belts with a tensioner pulley?  I ask as my book calls for 14lbs and 7/16" deflection
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Offline Kbeitz

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Re: Correct Drivebelt Tension
« Reply #7 on: February 11, 2018, 06:25:36 PM »
Would that same chart apply to belts with a tensioner pulley?  I ask as my book calls for 14lbs and 7/16" deflection

No idea... Sorry...
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Offline squirrel dog

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Re: Correct Drivebelt Tension
« Reply #8 on: February 11, 2018, 07:41:42 PM »
May be a little pricey but could you go to a cogged belt and pulleys.  like a timing belt.  i did that on my woodmizer years ago when mine was slipping in wide dense woods.  solved my problem.

Offline Ben Cut-wright

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Re: Correct Drivebelt Tension
« Reply #9 on: February 11, 2018, 08:40:20 PM »

Can the deflection measurement be used with the chart you posted?  It appears the chart references much higher deflection pressures using a Burroughs tension gauge. This is a gauge I am familiar with as I own and use several models of that style.   

Offline Randy88

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Re: Correct Drivebelt Tension
« Reply #10 on: February 15, 2018, 08:27:29 PM »
You might want to consider into the equation belt stretch, as the belt runs and heats up, it stretches, at one time I knew what percent of stretch was allowable, I'm thinking maybe 3 percent or so.         

There is also a difference in belts, I'd have to do some investigating again, but there are belts out there that have a very small percentage of stretch compared to average v belts, again not being able to remember exactly, but less than a half percent comes to mind on certain types of belts.    I went through this about a decade ago on a machine I built that is hydraulic motor belt driven.


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