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Correct Drivebelt Tension

Started by Rougespear, February 11, 2018, 01:14:53 PM

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Rougespear

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.

slider

#1
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

Rougespear

#2
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.

Kbeitz

#3
February 11, 2018, 03:31:48 PM
Sorry... I forgot this was two parts. I made it all in to one picture.



 
Collector and builder of many things.
Love machine shop work
and Wood work shop work
And now a saw mill work

ladylake

#4
February 11, 2018, 04:06:30 PM
   

With how many # of pressure.  Steve
Timberking B20  18000  hours +  Case75xt grapple + forks+8" snow bucket + dirt bucket   770 Oliver   Lots(too many) of chainsaws, Like the Echo saws and the Stihl and Husky     W5  Case loader   1  trailers  Wright sharpener     Suffolk  setter Volvo MCT125c skid loader

Kbeitz

#5
February 11, 2018, 04:36:26 PM
Quote from: ladylake on February 11, 2018, 04:06:30 PM
   

With how many # of pressure.  Steve

I fixed it... Go back up and look again.
Collector and builder of many things.
Love machine shop work
and Wood work shop work
And now a saw mill work

Southside

#6
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
Franklin buncher and skidder
JD Processor
Woodmizer LT Super 70 and LT35 sawmill, KD250 kiln, BMS 250 sharpener and setter
Riehl Edger
Woodmaster 725 and 4000 planner and moulder
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White Oak Meadows

Kbeitz

#7
February 11, 2018, 06:25:36 PM
Quote from: Southside logger 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

No idea... Sorry...
Collector and builder of many things.
Love machine shop work
and Wood work shop work
And now a saw mill work

squirrel dog

#8
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.

Ben Cut-wright

#9
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.   

Randy88

#10
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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