We have been producing punches to cut acetate temples for 35 years.
Over this time, our technique and working methods have changed to ensure we deliver the best possible product and keep up with the latest technologies.
When we first started out, we used to cut the punches with a bandsaw and file them down by hand: we screwed them to the base and then tempered them. As we didn’t have technical drawings to work from but just sketches or shapes made with a file, the level of accuracy was poor and it was extremely difficult to reproduce a punch that was the same as the previous one.
As new technologies were introduced, including wire electro-erosion, we adopted them, replacing the bandsaw with wire EDM. We started with a CAD file and cut the punch using a numerical control machine, achieving a decidedly higher degree of accuracy and quality. Then we fixed the punch into place with screws as we had done in the past before tempering it.
We realised, however, that the final heat treatment deformed the punches, meaning the original dimensions were not always exactly the same and the end result did not achieve the perfection we sought. So we came up with a method that gave us greater precision and today we produce punches using our own technique. We start with steel plates that are hardened and tempered until they reach the right hardness and toughness needed for the next stages.
Then we cut the punch using wire EDM following the design of the temple and we file it manually to make sure it cuts perfectly. The punch is then welded to its fixing base.
Thanks to this method, not only are we guaranteed the best possible end result but we have also speeded up production time: as the plates are already tempered, we can produce a punch in just 24 hours, meeting our customers’ urgent requests.
This is D.F.: technology, accuracy and attention.