Unistraint: If it doesn't bend, it doesn't matter


Unistraint, marker for scale.


There is finally a giant calibration artifact that works.

Here we are talking about one point two five meter (50 inches) and two point three meter (90.55 inches) long, ball bars, scaled bars, SMR scale bars.

Can you imagine how hard it would be to bend a sixteen inch thick piece of aluminum? Now, imagine trying to bend four pieces of sixteen inch thick aluminum held in parallel.

The fact that these sixteen inch thick pieces of aluminum are only twenty thousandths of an inch thick (patent pending) it doesn’t matter, as long as the sheets don’t buckle and these devices have built in anti buckling bars (patent pending). See “Blanding on the theory of sheets.”

So now we have a perfectly rigid frame, but how do we couple the long artifact to it, without all of the distortion problems, due to the physical inaccuracies of the long artifact itself?

“UNISTRAINT” (trade name applied for) is another one of the breakthrough technologies used on these new artifacts. This technology uses a very rigid foam with a youngs modules of elasticity of (25,000,000psi) to encapsulate the long artifact and to rigidly couple it to the rigid frame (patent pending).

A two point three meter unistraint weighs less than 100 pounds and can be setup and measured in five minutes by one man.


Unistraint Anchor and Trivet


In order to cope with the thermal sensitivity of the very long artifact, it is made of Invar®, which is a nickel iron alloy that has an extremely low thermal coefficient of expansion.

The artifact is constructed in tubular form to reduce its weight and to provide a line of sight from end to end to enhance calibration (Patent pending).

The giant Invar artifact is coated with an elastomer layer to separate the expansion characteristics of the frame from the very low expansion properties of the invar artifact itself (patent pending).

One of the problems that has always plagued large artifacts is their weight. I watched a company in Germany handling a two and a half meter artifact of fiber construction, while doing a calibration. It took three technicians and almost twenty minutes to setup and make the first measurement.




Achieving absolutely rigid positioning of the giant artifact without the gross distortion caused by a huge clamping force is achieved through the use of a miter gear, like device, that locates and locks the rotating device, at various anular positions, without any backlash or clamping distortion (patent pending).

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