In the ammo industry, and we burn a lot of carbide dies every week in our sinkers. We only use copper tungsten for carbide, and use mainly graphite for our steel parts. We also do use a mixture of graphite and copper tungsten on some steel parts that we make in larger quantities. We use graphite as pretty much roughers to remove the material and then copper tungsten to get a really good finish and not use as many trodes due to less wear on copper tungsten. Not sure on tolerances and all with the carbide part you burned, I look at it and would use 5 copper tungsten electrodes if it was a die that we would make for our uses and average tolerances. That would be 2 roughers, 2 semi-finish and then 1 finish. Flushing is key though as well, on almost all our parts we are able to get through part flushing from the bottom which makes a world of a difference.
I usually use negative polarity to burn carbide, short on time but also short off time to keep the generator frequency high. it's not fast, but stable.
Thanks for sharing, video helped a lot, burning out a broken carbide drillbit and was having terrible luck as it's an older sinker with no carbide tec, I was able to take info from your video and get my stability from 20% to 80% and more than triple my cutting speed without causing additional electrode wear. I'm using a copper 3mm hole popper electrode and spindle in my Charmilles Form 2-lc. Thanks!
Every company I've worked for realized that mistakes happen, and sometimes they're expensive. The point is not to make the same mistake twice.
In the ammo industry, and we burn a lot of carbide dies every week in our sinkers. We only use copper tungsten for carbide, and use mainly graphite for our steel parts. We also do use a mixture of graphite and copper tungsten on some steel parts that we make in larger quantities. We use graphite as pretty much roughers to remove the material and then copper tungsten to get a really good finish and not use as many trodes due to less wear on copper tungsten.
Not sure on tolerances and all with the carbide part you burned, I look at it and would use 5 copper tungsten electrodes if it was a die that we would make for our uses and average tolerances. That would be 2 roughers, 2 semi-finish and then 1 finish.
Flushing is key though as well, on almost all our parts we are able to get through part flushing from the bottom which makes a world of a difference.
The 3 most important factors in ram/sinker EDM;
#1. Flush!
#2. Flush!
#3. Flush!
I usually use negative polarity to burn carbide, short on time but also short off time to keep the generator frequency high. it's not fast, but stable.
Jim is the man , met him in 1999 . When I started running Mitsubishi cnc edm
Thanks for sharing, video helped a lot, burning out a broken carbide drillbit and was having terrible luck as it's an older sinker with no carbide tec, I was able to take info from your video and get my stability from 20% to 80% and more than triple my cutting speed without causing additional electrode wear. I'm using a copper 3mm hole popper electrode and spindle in my Charmilles Form 2-lc. Thanks!
So this isnt about Raves and Techno? LoL
Lol no, but still cool!
Copper tungsten is always the way to burn carbide
Mitsubishi is always there for ya
When I make a mistake it's usually pack your tool box and get out, until the owner calms down and then it's no pay increase on your next review. 😢