On Sun, 3 Dec 2017 19:48:31 -0800, dogs wrote:

On 12/03/2017 04:36 PM, wrote:
...
But as it turns out the bolted in parts should actually dampen
vibrations. Even though the bolted in pieces fit as perfectly as I can
make them (they are lapped to fit) I thought the interface might lead
to problems. Turns out this interface should dampen vibrations, even
though everything fits well and the bolts are quite tight.
I guess my seat-of-the-pants engineering worked better this time
than actually thinking about it.

Eric

Can you explain?
Waves arriving at the interface are partially reflected back onto
themselves, cancelling out by destructive interference. Did I get it?
There was some of that as well as the waves just having trouble
crossing the interface. I don't understand it very well. I'm gonna
have to spend some time learning about it.
My goal was to just make the bed into a stiffer beam. I understand
how to do that. It's all pretty easy and Machinery's Handbook has all
formulas.
Eric