How to measure band force?

[lawstraljan16]

Is there any formula how to measure band force of your gun? Id like to know my custom guns band force, and other projects band force in the future.

Any help will be appreciated.

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[Bill McIntyre]

The only really accurate way is to use a scale. But for a general approximation, 5/8" (16 mm) bands stretched to 3.5 to 1 are alleged to generate 100 pounds, while 9/16" (14 mm) generate 80 pounds of force.

 

[lawstraljan16]

Thanks mate. Guess that scale woulf cost a hand and leg to get?

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[Bill McIntyre]

Thanks mate. Guess that scale woulf cost a hand and leg to get?

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It depends on how accurate you you want to be, but spring scales don't have to be expensive.

spring scales

 

[Tin Man]

Primeline Industries supplies much of the rubber band material here in the States. They have a force calculator on their website: http://www.primelineindustries.com/tools.html

It's probably not as accurate as an actual measurement, but it might get you close enough.

 

[Cutthroat]

The key to determining the elastic strength is the Cross Sectional Area of the tubing. This is the wall thickness determined from subtracting the ID from the OD. The wall thickness is needed to determine the CSA. Since the CSA of a given size of tubing is the constant, deferent lengths of tubing will have the same elastic strength in pounds of energy, e. g. Piece of tubing 1/2”OD x 1/4”ID x 8” has the same elastic strength as a piece of 1/2”OD x1/4”ID x 16” tubing = 41 lbs.

3/8OD x 3/2ID = 9 lbs 2 lengths x 8” draw to 16” = 18 lbs

1/2OD x 1/4ID = 41 lbs 2 lengths x 8” draw to 16” = 82 lbs

1/2OD x 1/8ID = 62 lbs 2 lengths x 8” draw to 16” = 124 lbs

The Primeline calculator is mathematically correct. Also remember Latex is a natural material. So it will cure and get stronger over a year or so. The difference between actual elastic energy of a piece of tubing and the calculated is negligible.

 

[lawstraljan16]

The key to determining the elastic strength is the Cross Sectional Area of the tubing. This is the wall thickness determined from subtracting the ID from the OD. The wall thickness is needed to determine the CSA. Since the CSA of a given size of tubing is the constant, deferent lengths of tubing will have the same elastic strength in pounds of energy, e. g. Piece of tubing 1/2”OD x 1/4”ID x 8” has the same elastic strength as a piece of 1/2”OD x1/4”ID x 16” tubing = 41 lbs.

3/8OD x 3/2ID = 9 lbs 2 lengths x 8” draw to 16” = 18 lbs

1/2OD x 1/4ID = 41 lbs 2 lengths x 8” draw to 16” = 82 lbs

1/2OD x 1/8ID = 62 lbs 2 lengths x 8” draw to 16” = 124 lbs

The Primeline calculator is mathematically correct. Also remember Latex is a natural material. So it will cure and get stronger over a year or so. The difference between actual elastic energy of a piece of tubing and the calculated is negligible.

What? Sorry mate, way too complicated.

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