Some of our customers are frustrated when they experience slippage of their strain gauge extensometers. Close examination of their extensometer knife-edges often reveals wear that has rounded the edge, increasing the likelihood of slippage. If you are experiencing extensometer slippage, take a close look at your knife-edges. For replacement parts, please contact your local Instron representative.
Note that the knife-edges are precision engineered to ensure an accurate gauge length, so we do not recommend that you attempt to sharpen the edges yourself.
1 comment:
Also check your extensometer clips which attach the specumen to the knife edges - there are usually a variety which are made for different specimen thicknesses. There's always good old rubber bands which can also substitute for clips (you may have to wind them a few times, or make a small rubber band by tying a knot inside a larger rubber...even better, take some of the very small rubber bands from your kid if he has braces). Don't overtighten which can lead to the knife edges cutting into the specimen - causing premature specimen breakage at that point.
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