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Author Topic: band blade tension  (Read 343 times)

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Offline Blaszer

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band blade tension
« on: November 30, 2018, 07:38:14 PM »
Ive got a band mill that I built and have used for years...  What is a good primitive way to measure the tensionon my blade?My tensioner is a 1 1/2 all thread that pushes the driven wheel away from the drive side wheel...I guess the question is, how much deflection in the bad over a certain distance would indicate proper tension.?

Offline GAB

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Re: band blade tension
« Reply #1 on: November 30, 2018, 07:57:12 PM »
Using a 1- 1/4 x .045 thick blade I would aim for at least .001" per inch of length to start and see how it works.
Gerald
W-M LT40HDD34 w/6' ext & SLR, JD 420, JD 950w/loader and Woods backhoe, V3507 Fransguard winch, Cordwood Saw, 18' flat bed trailer, and other toys.

Offline Southside logger

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Re: band blade tension
« Reply #2 on: November 30, 2018, 09:19:02 PM »
There are cheaper one out there but this sort of gauge will give you an accurate reading, you could calibrate your tensioner this way too.  

Band tensioner
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
Enough cows to ensure there is no spare time.

Offline DbltreeBelgians

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Re: band blade tension
« Reply #3 on: November 30, 2018, 09:23:18 PM »
I hope that .001 is .001 per inch in a  6 span. If hes got a 158 band thats gonna be a whole lot of stretching the way I see it. Maybe Im wrong on that.

Brent

Offline thecfarm

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Re: band blade tension
« Reply #4 on: December 01, 2018, 06:12:22 AM »
Push down on the middle of the blade with your thumb. ;D 
I have a Thomas mill. Been doing it that way for years. I must have a feel for it. It works. ??? 
Model 6020-20hp Manual Thomas bandsaw,TC40A 4wd 40 hp New Holland tractor, 450 Norse Winch, Heatmor 400 OWB,YCC 1978-79

Offline bandmiller2

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Re: band blade tension
« Reply #5 on: December 01, 2018, 06:51:07 AM »
Look up the Timberwolf site and try their flutter test. Too much tension is the leading cause of band breakage. It just seems so natural to highly tension a band to force it on a straight path but it doesn't work that way. When a good sharp well set band cuts straight that's the proper tension. My own home built has springs I compress to a certain distance. Frank C. 
A man armed with common sense is packing a big piece

Offline Chuck White

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Re: band blade tension
« Reply #6 on: December 01, 2018, 07:07:12 AM »
If your lumber comes out nice and smooth, without a lot of dips and dives or random marks, your tension is most likely good!
~Chuck~
Retired USAF (1989), Retired School Bus Driver (2012), and now a Mobile Sawyer
1995 Wood-Mizer LT40HDG2425 Kohler - Shingle & LapSider, Cooks Cat Claw Sharpener, 4-foot Logrite cant hook.
Basic mechanical skills are all that's required to maintain the Wood-Mizer.
I LOVE MY SAWMILL

Offline Southside logger

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Re: band blade tension
« Reply #7 on: December 01, 2018, 07:50:35 AM »
Too much tension also leads to bearing failure, so there is a sweet spot. 
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
Enough cows to ensure there is no spare time.


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