I have been doing ALOT of tests making these inserts!
I think I have made abt 10 different "stamps" to make imprints on acrylic blanks - here is one made from brass.
A piece of acrylic is then clamped, heated and finaly pressed to get imprints from the numbers/indexes.
The back is tuched up a bit with a flat stone and some sandpapper.
It´s then set up in a jig and milled to final dimensions.
After beeing milled, the inserts are cleaned and the numbers/indexes are filled with a mixture of paint and lume powder.
Then it´s time to print the minute markers
Same here, I think I made 10 plates before I was pleased!
Here is a batch of test inserts after beeing printed.
After the markers are printed, the back gets a protective layer of lacquer so the final layer of black paint does not mix with the paint in the numbers.
And here is a milled version..
The edges get a radius of 50um from the endmill but the back is very sharp.
Personally I like this version more, but the stamped ones are more true to the original.