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Make a Bandsaw Tension Gauge

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Blog entry by GarageWoodworks posted 10-28-2012 04:45 AM 1714 reads 3 times favorited 6 comments Add to Favorites Watch

Make a bandsaw tension gauge from scrap wood and a dial indicator.

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6 comments so far

View IrreverentJack's profile

IrreverentJack

724 posts in 1529 days


#1 posted 10-28-2012 01:53 PM

Thanks for the video Brian. I guess it’s time for a new tension spring for me. -Jack

View GarageWoodworks's profile

GarageWoodworks

438 posts in 842 days


#2 posted 10-28-2012 02:34 PM

Yep, I’ve read that they can lose their ability to apply tension and need to be replaced over time.

-- Subscribe on YouTube: http://www.youtube.com/user/GarageWoodworks?feature=guide

View nobuckle's profile

nobuckle

1120 posts in 1447 days


#3 posted 10-28-2012 03:05 PM

Very cool! Can you explain a little more about the formula you used to come up the 15,000 PSI?

-- Doug - Make an effort to live by the slogan "We try harder"

View GarageWoodworks's profile

GarageWoodworks

438 posts in 842 days


#4 posted 10-28-2012 03:17 PM

The 15,000 psi recommendation came from a FWW article I read. The formula for blade stretch is:

(S/D) x 29,000,000 Young's modulus for steel

S = blade stretch in inches
D = length of blade measured in inches

(0.001”/5”) * 29,000,000 = 5,800 psi

-- Subscribe on YouTube: http://www.youtube.com/user/GarageWoodworks?feature=guide

View GarageWoodworks's profile

GarageWoodworks

438 posts in 842 days


#5 posted 10-28-2012 03:23 PM

See: http://www.finewoodworking.com/pages/w00013.asp

quote from above article: “Most blade manufacturers recommend 15,000 psi to 20,000 psi for a common carbon-steel blade.”

-- Subscribe on YouTube: http://www.youtube.com/user/GarageWoodworks?feature=guide

View Kindlingmaker's profile

Kindlingmaker

2654 posts in 2212 days


#6 posted 10-29-2012 01:49 AM

Thank you!

-- Never board, always knotty, lots of growth rings

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