In recent years we are all starting to focus on the healthier life styles and particularly looking at what we eat.
Although process food is convenient cooking and baking today can be enjoyable and has the added advantage of being as healthy as you want it to be.
So many processed meats have additives and "E" numbers you would not want to consume.
So the answer is to buy yourself a meat grinder and grind your own locally sourced meat.
Not only will you know what goes into your burger but also it will probably be tastier and if you prepare in large enough batches maybe as cheap.
So if you are going to invest in a meat grinder it helps if you understand the mechanics of one.
Meat is normally put into a funnel and then a rotating screw acts as a conveyor to force the material onto a blade and through a plate with holes in, normally known as a hole plate.
You can normally attach different size hole plates to give different grades of mince.
Some grinders can act as mixers and can mix other ingredients to your raw material.
Also some  have a special attachment on the end that can aid to make sausages.
When choosing a meat grinder budget and the amount of meat you wish to grind will dictate the powering method of your machine.
If you only need to grind meat for personal use then a manually powered device should suffice however if your budget allows it an electric powered machine is a lot easier to operate.
Manual meat grinders normally work by rotating a handle that in turn rotates the screw conveyor.