Hi Vankata:
Something is badly wrong here, and I don't know how much is just the translation from Bulgarian into English.
You say
"we have always worked without flushing".
The AD 35L is a sinker EDM machine...I don't understand how you can make it burn at all without flushing.
Now it IS a linear motor machine so if you mean "without flushing holes drilled in the electrode, using only jump flushing" your comment makes perfect sense.
By the way, "jump flushing" is a way of saying "using the pumping action of the ram to force EDM oil into and out of the spark gap" just so we understand each other.
If I understand correctly, that's what you are talking about.
If so, the flushing should be good enough and that is not the reason you can't get the finish you want.
There are three main reasons why a bad finish happens:
1) the dielectric oil is so dirty the contaminants spark in the gap instead of the electrode sparking in the gap...maybe change the filters and try again.
2) the electrode material is too coarse grained for the finish you want...try a copper electrode instead of a graphite electrode.
3) you burned too much away in the roughing burn and it won't clean up in the finishing burn...check the size of the roughing and finishing orbits.
If you are setting up for a VDI 2 and you are getting a VDI 15, I'd look first to see if you have enough material left to clean up after roughing: maybe your roughing orbit is too big (or your finishing orbit is too small).
Cheers
Marcus
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