When I first started competition cutting in the Australian guild a few years back I got a shock at my results. Of the four stone comp. I had two stones marked in the 70s.
Since being semi-retired and looking to expand my hobbies, putting some time and effort into it wasn’t an issue and now I find it a great challenge. I also enter the US annual competition and very happy with my results in this year’s comp.
One of the pieces of equipment that has been a great help to me is the slider gauge. If setup and used correctly it can keep a record of the height of the faceting head on the mast, to a practical accuracy of 0.05mm.
This allows you to return to any facet as shown in the picture. To fix errors such as A and B without messing up facet alignments C.
As shown in the picture, its made to keep the machine head to a precise depth.