Shop Press Brinell test

[tonyfoale]

First tests showed me that I need to work on this issues. But seems like it worth the effort to keep messing with.
Thank Tony for the ideas you bring me. Will try to meassure penetrating depth with brinell ident and do some match to convert it to diameter.

If you follow the Rockwell testing loads and indenter specifications then you wouldn't need to convert depth to diameter, the Rockwell hardness is based on penetration depth. At least one of the Rockwell scales uses a diamond shaped stylus and so diameter is not relevant. Rather than make your own you can buy Rockwell indenters off the net for not much money. To cover most jobs you probably only need 2, one each for the B & C scales, maybe three if you think that you'll need scale A also.
https://www.ebay.com/p/Hrc-3-Steel-D....c100005.m2219

If you continue with your own made indenters there is a simple way to do better than using STEEL ball bearings. If get an old or broken carbide milling cutter of the right diameter you can grind a hemisphere on one end and use that. The carbide is harder than steel balls.