Oxford Precision Hardness Tester - Varying Results???
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  1. #1
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    Question Oxford Precision Hardness Tester - Varying Results???

    Hi,

    We have a Oxford hardness tester and I am getting some strange results, the unit is less than 1 year old. It seems to measure correct when testing against all of my calibration blocks but when I test parts at a specific length (around 40mm) I am getting a low result (around 6Rc down).

    If the component was an odd shape or thin walled for example I would put it down to these factors, this is not the case here though as the parts are basically short tubes and around 15mm WT. I am testing on the end face so all the compression is transferred end to end not radially on the diameter (hopefully that makes sense).

    I have tried lowering the table and sitting the part on top of a ground parallel block so that the test is carried out on a different section of the thread (The thread of the table height adjustment), this made no difference.

    It appears to only be parts around this length, unless I am completely missing something obvious, if anyone has any suggestions?

    Thanks.

    Note: I have tested the parts with another tester and all measured OK (as per material cert)

  2. #2
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    Weird. Table height shouldn't matter. Makes me think something is fishy with the elevating screw. Flexing? Something shifting when measuring? Screw worn out in that area?


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