MetalworkingFun Forum

hi this is the other thin i got don't no Wat its for all it has on the box is baty its old and the pant is flaking of it any one got a clue Wat it is right pics

(04-14-2014, 05:39 PM)krv3000 Wrote: [ -> ]hi this is the other thin i got don't no Wat its for all it has on the box is baty its old and the pant is flaking of it any one got a clue Wat it is right pics

It could possibly be for use with a Tensometer.
Tensometer is used for doing tensile tests on samples where the sample is stretched until it breaks.
This gadget could possibly be used for accurately measuring the amount of extension (stretch) in the sample.
It reminds me of one I have seen in use before. But I might be totally wrong with yours.

regards
bollie7

Hello Bob,

In agreement with Bollie, it is definitely some form of strain gauge, based on the flaking paint Production gauges are often baked after painting and use higher quality finishes than the one off gauges so the flaking might indicate this(or it might not, ),

I'd wager that it was a one off or limited production piece, probably made for testing samples in a production/quality control environment as the clamping screws are self centering making it easy to setup where lab equipment is in my experience unusually difficult to set up in an effort to make it more adaptable

The bar clamps have pointy grub screw tips though, which means it's probably not a tool for metallurgical testing as metallurgists get all fussy about marking their test pieces(notch sensitivity) but regardless of anything else you just cant deny how cool it is.

Incidentally, I might have a use for this if you don't, I know you collect this sort of thing but if you are interested in moving it on please let me know

Best regards
Rick

Could it be used for checking bandsaw blade tension?

Bob,

It is for testing the tension in the wire in a Wire EDM machine

thanks all for the help

How I think it works is, (I can't be sure it's the exact same type as the ones we used to have at the steelworks)
You slide the unit over a bar and clamp the thumb wheels, the pointy screws bite into the bar at a distance called the gauge length,
Then you externally load the bar in tension or compression but not in bending like you test belt or saw blade tension, if for example the bar has a cross section of 100 square millimetres and the load is a hundred newtons, the reading will be a direct strain reading when 1 Pascal of pressure is acting on the sample bar,
FYI it's more likely to be many thousands of newtons for example the yield strength for a particular steel might be 400MPa in this example the force on that bar would have to be 400,000,000N or 400 Mega Newtons to reach yield, so at 200 Mega Newtons there would be an expected stretch (called strain) when testing materials in a production environment the user would know what this number should be and if the sample test is out of spec it all goes in the scrap tub.

Or more likely after you get beaten up by the boss for finding an out of spec batch and costing the company thousands you leave the tricky little strain tester in it's box for good until it is sold to Bob at a Car Boot sale.

Regards
Rick