Author Topic: Sinker EDM question  (Read 689 times)

Offline Alphawolf45

  • Jr. Member
  • **
  • Posts: 90
Sinker EDM question
« on: January 18, 2019, 01:15:29 PM »
 I finally got my sinker edm running again. I had only operated it once last year when I first got it so I don't really know how to use it or exactly what I should expect from it. It's primary malfunctions is just the idiot that is trying to run it without consulting the operators manual...

    It is capable of 50 amps output but I am running it at 10 amps so that I don't pop the fuse , my 5hp rotary phase converter cant supply enough juice to it to run at 50 amps - I may get 20 amps if I push it......Irregardless . At 10 amps using a 1/2" square graphite electrode I am only burning .001 depth per minute in a steel workpiece.. Does that sound right.?? That my friends is slower than slow..


  Also, an 85 yr old still working tool and diemaker friend of mine talks about arcing going on that damages the workpiece and the electrode... What is that and how do you recognize it? I can call him but he is real hard of hearing, doesn't hear his own phone ringing unless he is near it. Photo shows my EDM today with most of it's covers pulled.. I like it a lot but I am afraid the beastie don't much like me.
I am not actually retired ,I merely find myself disabled by an intolerance for productive activity.

Online seadog

  • Full Member
  • ***
  • Posts: 205
  • Country: gb
  • NE London
Re: Sinker EDM question
« Reply #1 on: January 18, 2019, 01:31:47 PM »
awemawson is your man. He has a working EDM. I'm sure he'll be along soon.

Offline Alphawolf45

  • Jr. Member
  • **
  • Posts: 90
Re: Sinker EDM question
« Reply #2 on: January 18, 2019, 01:49:25 PM »
 Yeah ,before I had chemo therapy screw with my head I was maybe  half as bright as Awemawson.. Now I need an extra heaping of  help.. :doh:
I am not actually retired ,I merely find myself disabled by an intolerance for productive activity.

Offline kayzed1

  • Full Member
  • ***
  • Posts: 207
Re: Sinker EDM question
« Reply #3 on: January 18, 2019, 02:47:19 PM »
Yeah ,before I had chemo therapy screw with my head I was maybe  half as bright as Awemawson.. Now I need an extra heaping of  help.. :doh:

I thought it was only me..tis a bit of a bugger when you think you no what to do with a project only to find you need help, the help you used to give others before the
big C..  Keep on keeping on thou.
Lyn.

Offline Alphawolf45

  • Jr. Member
  • **
  • Posts: 90
Re: Sinker EDM question
« Reply #4 on: January 18, 2019, 04:16:32 PM »
  Shoot man, I used to sit in my backyard watching my dogs  and write out G-code for my oldest cnc mill and I'd compute the trigonometry in my head. I can barely do anything anymore. Doc says it will be 6 months until my brain gets back to normal.. Cancer is bad , Chemo is the killer of the bad cells and also those we need to figure stuff out...I dunno, my Mother died from my same cancer 1 month before I got my diagnosis. Dying is in the future of all of us,, Let me think clearly before I take the dirt nap.Dull brain is pretty awful..
I am not actually retired ,I merely find myself disabled by an intolerance for productive activity.

Offline Alphawolf45

  • Jr. Member
  • **
  • Posts: 90
Re: Sinker EDM question
« Reply #5 on: January 18, 2019, 05:01:13 PM »
 10 years ago I applied for a job at a big company.The job was for operating a cnc mill.....You know what kind of job that is-- basicly loading and unloading and loading and unloading parts into the machine.. Okay I had to take a test..I arrived several minutes after the test had begun.. I noticed that I was the only person in the room without a calculator. However I finished first...Test results showed that I had finished highest that was graded or considered...I didn't get the job as somebody with darker skin and a lower grade was give the position. Not that I care. Just interesting.
I am not actually retired ,I merely find myself disabled by an intolerance for productive activity.

Offline awemawson

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 6745
  • Country: gb
  • East Sussex, UK
Re: Sinker EDM question
« Reply #6 on: January 18, 2019, 05:18:51 PM »
Somewhere on the forum is a thread where I was sinking a 1/2" square using a copper electrode and I seem to remember that Pete-W asked how fast it went - can't for the life of me find the thread but it's here somewhere  :med:

 . . or it may have been the thread about making a big grub screw  :scratch:

As for arcing - that's bad. The electrolyte combined with the electronics should be totally preventing arcing. The discharge should happen in the last few microns of approach and the electronics cut off as soon as it happens

Oelheld have (or certainly had) a good downloadable EDM handbook on their site in the IONO-PLUS area.
Andrew Mawson
East Sussex

Offline John Swift

  • Sr. Member
  • ****
  • Posts: 344
  • Country: england
Re: Sinker EDM question
« Reply #7 on: January 18, 2019, 05:35:02 PM »
quote

"I didn't get the job as somebody with darker skin and a lower grade was give the position. Not that I care. Just interesting".

many bosses are second rate   but they know enough not to don't take on any one thats  too bright ,
threaten their position and take their job

                       John

Offline Alphawolf45

  • Jr. Member
  • **
  • Posts: 90
Re: Sinker EDM question
« Reply #8 on: January 18, 2019, 06:28:00 PM »
 You make no sesnec.
I am not actually retired ,I merely find myself disabled by an intolerance for productive activity.

Offline awemawson

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 6745
  • Country: gb
  • East Sussex, UK
Re: Sinker EDM question
« Reply #9 on: January 19, 2019, 04:09:20 AM »
What John is saying (that makes perfect sense) is rather akin to the Industrialist who told his secretary to search throughout his empire to find the absolutely BEST person to take over from him - then FIRE him  :clap:
Andrew Mawson
East Sussex

Offline Alphawolf45

  • Jr. Member
  • **
  • Posts: 90
Re: Sinker EDM question
« Reply #10 on: January 19, 2019, 06:52:57 AM »
 I am not too bright as I apparently cant spell.

    Thanks guys You have answered my question good'nuff. I will presume that .001 per minute at 10 amps is within the range that is considered normal...And terrible slow :palm:

  As for the job I applied for and didn't get. I didn't want anything except the chance to play with a newer cnc mill Than I have.. Consider that we have to buy our own machines and repair them and continually feed them new endmills and drills and inserts.. It would be nice for a while to run somebody elses machine and not be responsible for the costs of running it.
 
I am not actually retired ,I merely find myself disabled by an intolerance for productive activity.

Offline tom osselton

  • Hero Member
  • *****
  • Posts: 994
  • Country: ca
Re: Sinker EDM question
« Reply #11 on: January 19, 2019, 01:56:36 PM »
Had to buy your own machines! WTF!

Offline Alphawolf45

  • Jr. Member
  • **
  • Posts: 90
Re: Sinker EDM question
« Reply #12 on: January 19, 2019, 02:04:40 PM »
 Ohh my I laugh so much, Tom you are a comedium.  :mmr: :mmr:
I am not actually retired ,I merely find myself disabled by an intolerance for productive activity.