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)
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)