[How-To] How to make your own hardness tester.

[benmychree]

Interesting. The comment about not doing repeated tests in the same area also applies to my device but to a lessor extent.

Would that be because your ball indenter is lighter than a Shore indenter?

 

[GeneT45]

Thin material and tube are difficult to measure by any of the impact or indentation machines. Thin material needs some form of rigid backup but that is not so easy to do and get good results.

Understood. I was thinking (hoping) that perhaps the lighter impact on these rebound testers might at least reduce the need for absolute rigidity vs a 'real' Rockwell tester.

GST

 

[tonyfoale]

Would that be because your ball indenter is lighter than a Shore indenter?

The Shore leaves a mark, so that means that the nearby material has been compressed slightly. Mine leaves no visible sign but there will be some hardening in the area.

 

[tonyfoale]

Understood. I was thinking (hoping) that perhaps the lighter impact on these rebound testers might at least reduce the need for absolute rigidity vs a 'real' Rockwell tester.

GST

I think that the opposite would be the case. The indentation devices apply the load slowly and the object can move down on its support. The impact type requires inertia on the part being tested.