[pianotech] mystery clamp

[Susan Kline]

Maybe that accounts for all the knots, warping, beads of resin, and ends 
which wane instead of staying square -- it's just too much stretching! 
The pressure drives out the resin, and the grain tangles up and makes 
knots, sort of like a rope when you twist it too much.

I thought April 1 came only once a year? When did it start to have an echo?

susan


On 5/8/2012 7:31 AM, Ron Nossaman wrote:
> You're old too, remember when a 2X4 was 1-7/8 X 3-7/8? I do. Last I 
> looked, they had gotten down to 1-3/8 X 3-3/8. Personal lumber 
> stretchers went off the market when the high volume commercial models 
> were perfected. The story of a 2X4 losing 1/8" in milling from rough 
> to finish is true enough, but the continued reduction in cross 
> sectional dimension is due to the universal commercial adoption of 
> large volume, fast cycle lumber stretchers. It's called a Poisson 
> ratio. As the length is increased, the cross section dimensions 
> diminish. You can't make more material than is there, but you can make 
> it longer and thinner, and therefor sell more lumber (by length) with 
> less waste at more profit. I don't expect a 2X4 to get much smaller, 
> because they are about at the limit of stretch before they start 
> necking down too much in the middle. I suspect this is why the small 
> personal models aren't sold anymore. People just didn't know when to 
> quit, and blamed the manufacturer for the ruined scrap they tried to 
> over stretch into usable lengths.
>
> Ron N 

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