On Mon, 17 Feb 2014 22:50:28 -0800 (PST), wrote:

On Tuesday, February 18, 2014 12:40:22 AM UTC-5, Martin Eastburn wrote:
As I posted, I'd use a 50% fill of BB's - the video shows 100% fill.

You want the many hammer blows when you smack something.

Not convinced. Here's why:

F = ma : Half full gives me approx F = 1/2 ma

"Many hammer blows" : Force = ma (collission1) + ma (collisions2) ...
etc. = m(total)a

You only end up with approx 1/2 the amount of force as a full hammer head
spread out over multiple smaller collisions. The sum of which are still
1/2 a full head.


Martin

On 2/17/2014 10:34 PM, wrote:

I made a mallet (deadblow?) from walnut, maple and BBs. Incredibly fun
project.



The plans were taken from Shopnotes 1992 No2.



http://www.youtube.com/watch?v=t-j3UcfQ_rE



But you have ended up with a sledge hammer, not a dead blow.

A proper dead blow transfers all its force and no bounce back. You can hit
it as hard as you can on a concrete floor and it just "sits" there.

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