Re: [CAD_CAM_EDM_DRO] stress relieving

> > The idea is to make the metal ring until it relaxes. (and the tone
> > drops some)
>
> I've heard of this being done and have some understanding of the physics
> behind it. How effective do you suppose vibratory stress relieving would

be

> on a steel weldment?
>
> Doug Harrison

Hi Doug. These folks make great claims about vibration
stress relieving a36 structural steel as well as 1018 and 1020.
http://www.bonal.com/

They identify a resonance and apply vibration at a slightly lower frequency.

I have looked at their site, their patents, and even had reps visit.

It may very well work but I have a real problem with their
technical explanations. From a vibration analysis point of view
their descriptions are just plain nonsense.

Their units consist of an eccentric weight variable rpm motor
shaker, an accelerometer,and an old style chart recorder. They are quite
expensive.

As for some empirical data... I just checked final alignment
of the router base before bolting it to concrete. you saw it of course, but
for others I should say that it is a space frame
built up from a36 1/4x2 square tubing with 2x3"x6' rail mounting surfaces.
(hot rolled)

It has been built about a year and was subjected to a very bouncy truck ride
and nasty cantelevered forklift pickups
since the last data. It was not stress relieved by any method
but was carefully welded to try and minimise stress buildup.

I found one way mounting surface had twisted slightly resulting
in a .0025 error in the six feet. I quickly brought this back to
flat with a hand scraper.

Leslie Watts
L M Watts Furniture
Tiger, Georgia USA
http://www.rabun.net/~leswatts/wattsfurniturewp.html