What is the difference between Extrude Hone, EDM, and AFM?
Electro Discharge Machining is a process where an electrically charged wire burns a hole through metal. Bosch uses EDM to create nozzles, but on a very advanced machine that controls the angle and speed of the wire insertion. The angle of insertion is very important to keep correct or the spay angle will be changed, resulting in possible engine damage. When Bosch changes the speed of insertion they can achieve a cone shaped hole that will improve atomization. EDM’s used in the aftermarket are usually decommissioned medical instruments that do not have the ability to control either angle or speed precisely enough to create a quality product. Electro Discharge Machining that is done by Bosch is followed by Abrasive Flow Machining, to clean up any imperfections, remove burn residual and balance injector flow. Aftermarket EDMing does not use AFM to balance flow, or clean up any imperfections. Our Injectors use Extrude Hone Technology. We start with an EDM’d nozzle with the correct spray an
