EDM cutting is always through the entire workpiece. To start wire machining it is first necessary to drill a hole in the workpiece or start from the edge. On the machining area, each discharge creates a crater in the workpiece and an impact on the tool. The wire can be inclined, thus making it possible to make parts with taper or with different profiles at the top and bottom. There is never any mechanical contact between the electrode and workpiece (see above). The wire is usually made of brass or stratified copper, and is between 0.1 and 0.3 mm diameter.
Depending on the accuracy and surface finish needed, a part will either be one cut or it will be roughed and skimmed. On a one cut the wire ideally passes through a solid part and drops a slug or scrap piece when it is done. This will give adequate accuracy for some jobs, but most of the time, skimming is necessary.

A skim cut is where the wire is passed back over the roughed surface again with a lower power setting and low pressure flush. There can be from one to nine skim passes depending on the accuracy and surface finish required. Usually there are just two skim passes. A skim pass can remove as much as 0.002″ of material or a as little as 0.0001″. During roughing ( i.e. the first cut) the water is forced into the cut at high pressure in order to provide plenty of cooling and eliminate eroded particles as fast as possible. During skimming (accuracy / finish cuts) the water is gently flowed over the burn so as not to deflect the wire.

To assure that you can fully benefit from the EDM wire that CATCH EDM offers, please observe the storage and handling instructions below:
Right position
All the wires from CATCH EDM are packed, stored and shipped in the horizontal position. Please ensure that you will store your wires in a horizontal position when you receive it. Only in this way, it will be efficiently avoid unwinding or twisting issues.
Store it in original packing
Catch EDM wire are well packed with vacuum packing, which can protect wires from oxidation, dust. We suggest to put EDM wire in a dry area to prevent it from oxidation. 

At the beginning of wire cut EDM machine, selection of EDM wire is very easy and simple, because customer don’t have too much choice, only copper wire & brass wire. Also customer don’t have too much request on speed, precision, taper cutting, etc. Nowadays, customer have more choices because end-users have more request on cutting, and we are also able to supply varieties of EDM wire.

At the beginning of wire cut EDM machine, selection of EDM wire is very easy and simple, because customer don’t have too much choice, only copper wire & brass wire. Also customer don’t have too much request on speed, precision, taper cutting, etc. Nowadays, customer have more choices because end-users have more request on cutting, and we are also able to supply varieties of EDM wire.