Thank you all for quick response and good luck.

Neil Miller, thank you for the article, those angles are one of the things what I was looking for.

JimmyHAD, I will definitely make some sort of handle for my own safety, after all one part of the process will probably involved fast rotating water stone so no need to risk flying oversize wedge razor.

pixelfixed, at the moment they are using those disposable blades but the woman operating machine said that they don't make nice and clear cut as the wedge one from the first post (of course - if it is correctly sharpened). some sort of lines from cutting are visible in the sample when looked under microscope. so she wants the wedge one as soon as possible.

I’m playing with a thought to make it fully flat with no secondary and then they can easily put on some secondary if the blade is chipping or similar.

In some 10 days I’ll post pictures of the oil stone they bought along with blade. It would be nice to hear your thoughts on that.