Posted by Bill on September 29, 2003 at 22:23:16:

In Reply to: Re: Mechanics - Center of Percussion posted by Gordon England on September 29, 2003 at 12:09:01:

: : Not sure if this topic is off the scope of this forum but I have not been able to find someone with more experience in this then myself.....

: : I am designing a mechanism "hammer" to be cut out of 3/16" plate that will be spring powered to swing through an arc of about 70 degrees. It will strike a rod with a 3/8 radius on the end of the rod. The surface of the "hammer" that strikes the rod will be flat and perpendicular to the axis of the rod.

: : I need to minimize the reaction at the pivot point and make the strike as fast and as smooth as possible.

: : I want to match the center of strike with the Center of Percussion which is straightforward enough to calculate and design for. However, the hammer is "L" shaped and a line through the Center of Rotation/Center of Gravity/Center of Percussion is not perpendicular to the axis of the 3/8" rod.

: : Does the non-perpendiculary matter in designing for a "sweet spot"? Everything I have read on the COP talks about hammers or baseball bats which have a uniform centerline that coincides with the COG and COP.

: : Thanks in advance

: : Bill
: :

: Hi Bill

: Off topic but interesting question. Not totally sure, but as long as the striking point is on the same radius as the centre of percussion, I don't think it matters.

: Regards Gordon

Thanks Gorden.......I guess Ill have to test the apparatus and get some data with accelerometers to see how different shapes react.

thanks again
Bill

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