You have a few options when it comes to parts fabrication from sheet or strip metal. Here are some methods that are best for efficiency, cost effectiveness and quality.
The primary problem is a case of multiple identity disorder: photo chemical machining, PCM, photo chemical etching, photo etching, chemical etching and chemical machining all refer to the same process. We dont wonder why you are confused. In speech, I always call the process photo etching. However, if you want to be found, you have to be known all the different ways.