How are bowling balls made to have different weights?

[Hammer]

I was just thinking about that today. What is changed in a bowling ball to make it different weights like 12, 13, 14, 15, 16lbs.? They all have the same circumference and diameter. Is the core weight changed? I just was wondering. Can anyone shed some light on this?

[Brother_jd]

i believe they put a different ratio of something in the shell.

[bowl1820]

The weight is changed by variations of the filler material and the other high-density materials used in the ball core. Not by changing the coverstock material.

Ball filler is a lighter, less dense substrate that enables the manufacturer to make the weight block out of more dense material.

[Zothen]

I thought it was the core that was made lighter?

Zothen

[Brother_jd]

what bowl 1820 said

[martinezsam2495]

Wow detailed explanation,
Props Bowl1820

[LonelyBowler]

I think it's funny that bowling ball sites always show cores to look interesting and metallic but they're all some type of resin.

Here are some videos though

http://www.youtube.com/watch?v=mDtS955HnD0
http://www.youtube.com/watch?v=qTUHnvZSnns
http://www.youtube.com/watch?v=FA3dUp_xqSU

[The German Shepherd]

That first video states that it is varying concentrations in the COVER that makes the difference in weight....

Jay