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Hi Hanytrade,
It seems like you are asking about the grinder on a verticle grinding mill.
Are you asking if metal is better than stone?
I don't know if anyone on this forum has a verticle grinding mill. If they do, I'm sure they will reply to your question.
Rose
I had a stone grinder years ago...bought it from Ambex. I do not think they sold very many. Selling point was it didn't heat up during grinding large amounts and could grind finer I believe...great for Turkish coffee. Problem is I didn't sell a lot of Turkish coffee.
To be honest...it was over 20 years ago. I just remember that it made very consistent turkish ground coffee. I Think the stones were more polished than the ones in your pics..but like I said it was a long time a go.