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-   -   pic: 294 - This is How we cut (wire EDM) (http://www.chiefdelphi.com/forums/showthread.php?t=58722)

AdamHeard 11-09-2007 18:59
pic: 294 - This is How we cut (wire EDM)
 

Pavan Dave 11-09-2007 18:59
Re: pic: 294 - This is How we cut (wire EDM)
 
Could you explain what Wire EDM is and how and why it is used please?

AdamHeard 11-09-2007 19:03
Re: pic: 294 - This is How we cut (wire EDM)
 
They can cut any shape as it is wire (very, very thin) that does the cutting with electricity.

Team 195 cut their wheels with one.

We've used it to cut keyways, odd sized hex holes, strange hubs (5mm w/ 4.5mm flat), etc...

Dan Petrovic 11-09-2007 19:28
Re: pic: 294 - This is How we cut (wire EDM)
 
The best description I can give is that it's like a waterjet.

Although, from what I've heard, EDMs leave a cleaner edge than waterjets.

DonRotolo 11-09-2007 21:09
Re: pic: 294 - This is How we cut (wire EDM)
 
Think of it as a very small wire, and sparks are made to jump from the tip of thr wire to whatever metal workpiece you want to shape. The sparks vaporize a tiny amount of the metal workpiece, and if you do it often enough you spark a hole into the workpiece. Now, control the spark and wire tip position very precisely, and you can shape some really complex shapes. Unlike a waterjet, you don't have to cut all the way through.

EDM - Electical Discharge Machining.

Don

AdamHeard 11-09-2007 21:14
Re: pic: 294 - This is How we cut (wire EDM)
 
Quote:
Originally Posted by Don Rotolo (Post 641786)
Think of it as a very small wire, and sparks are made to jump from the tip of thr wire to whatever metal workpiece you want to shape. The sparks vaporize a tiny amount of the metal workpiece, and if you do it often enough you spark a hole into the workpiece. Now, control the spark and wire tip position very precisely, and you can shape some really complex shapes. Unlike a waterjet, you don't have to cut all the way through.

EDM - Electical Discharge Machining.

Don
Well... for the machines we have that is halfway correct.

We have a wire EDM which has a wire that goes through the part and cuts profiles.

The other is called a "Sinker" (I think) which as a shaped electrode (like a hex shaft) that when pushed into the piece, takes of .003 at a time. This doesn't have to go all the way through.

Cory 11-09-2007 22:31
Re: pic: 294 - This is How we cut (wire EDM)
 
Quote:
Originally Posted by InfernoX14 (Post 641758)
The best description I can give is that it's like a waterjet.

Although, from what I've heard, EDMs leave a cleaner edge than waterjets.
as well as leaving a cleaner finish, they can machine much smaller radii, and can hold much closer tolerances.

Qbranch 12-09-2007 11:23
Re: pic: 294 - This is How we cut (wire EDM)
 
Things that describe a wire EDM machine:

>Swiss-Watch Accurate
>Cuts things you can't cut any other way
>Slower than Molasses on the dark side of the moon in january. (Rough your parts with a standard CNC machine first if possible, or wait a day or so)
>Smoky
>$$$$$

If you can...
>See if you can use a contact EDM machine (carbon/graphite shaped electrodes) which cut faster.

They make cool stuff... but see if you can make it another way first! (Broaching, etc.)

-q

EricH 12-09-2007 16:35
Re: pic: 294 - This is How we cut (wire EDM)
 
Quote:
Originally Posted by Qbranch (Post 641878)
Things that describe a wire EDM machine:

>Swiss-Watch Accurate
>Cuts things you can't cut any other way
>Slower than Molasses on the dark side of the moon in january. (Rough your parts with a standard CNC machine first if possible, or wait a day or so)
>Smoky
>$$$$$
Add down when you need them and that's the lot, I think. This machine was down for some reason in February--and both 330 and 294 needed to put a keyway in a sprocket right at the end of build! (ECC didn't have the right size broach at the time. They got one a week or so later.)

Raul 12-09-2007 19:37
Re: pic: 294 - This is How we cut (wire EDM)
 
Quote:
Originally Posted by Qbranch (Post 641878)
Things that describe a wire EDM machine:

>Swiss-Watch Accurate
>Cuts things you can't cut any other way
>Slower than Molasses on the dark side of the moon in january. (Rough your parts with a standard CNC machine first if possible, or wait a day or so)
>Smoky
>$$$$$

If you can...
>See if you can use a contact EDM machine (carbon/graphite shaped electrodes) which cut faster.

They make cool stuff... but see if you can make it another way first! (Broaching, etc.)

-q
Adding to this:
> it can cut through very thick metal - I have seen as much as 4 inches, but very slowly
> it can make a tapered cut from the top to the bottom through the metal thickness
Both of these come in handy for making molds and punch press tools.

Chief Pride 05-10-2007 22:00
Re: pic: 294 - This is How we cut (wire EDM)
 
YOU HAVE A WIRE EDM???

im so jelous :(

Binome 06-10-2007 00:37
Re: pic: 294 - This is How we cut (wire EDM)
 
The EDM is an amazing tool, we used one last year for getting a coupler done for the window motor, and it turned out great.


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