Re: Wire EDM

Hi,
I've seen two kinds of Wire-EDM

1) For Brass Wire
There are two reels of brass wire one new other used.Stops only when the wire breaks. U have to start all over (the program).

2) For Molebedinium Wire
This one is more useful as there is a drum of wire which rolls back and forth using the wire on the drum util it breaks(you can set the drum run through sensors). As the wire breaks the circuit breaks & table stops the feed.Also the feed stops when the drum stops to reverse.


1st terminal of current is attached with the drum with carries the wire
2nd terminal to the pallet on which job is attached

Imran


-----------------------------------
--
Included message
From: Ian Wright <Ian@...>
Date: 22 Sep 1999 15:05:40
--

From: "Ian Wright" <Ian@...>

Hi,

The wire EDM machine I have seen had two spools, one above and one below the
work which were each about 5 or 6 inches in diameter. The wire travelled
from one spool to the other in about 20 seconds and then reversed and
travelled back to its original spool. It fed onto the spools in a single
layer. This sequence was repeated continuously. The wire was about 6 or 8
thou diameter and was, I believe, made of Tungsten ( a friend with a scrap
yard apparently gets a lot of this wire in and refers to it as 'magnetic
brass' - i.e. it is brass coloured but can be picked up by their
electromagnet.). In the machine, I understand that the wire was fed through
sapphire feed holes but I am not sure how the cutting current was passed to
it - perhaps a graphite shoe?
--
Ian W. Wright
Sheffield UK

----- Original Message -----
From: David Howland <dhowland@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Sent: 22 September 1999 19:56
Subject: [CAD_CAM_EDM_DRO] Wire EDM


> From: David Howland <dhowland@...>
>
> Can someone explain how wire is fed in a wire EDM, and what method is used
to reduce the possibility of the feeding wire welding itself to the feeding
mechnism? As the wire leaves the spool, what does the wire see as it
travels to the work (from the spool through the mechinisms and to the work
itself)? How does the machine know of problems with the wire, or when the
wire runs out? Does the wire rotate to maintain shape in the work?
>
> David Howland
>
> -----Original Message-----
> From: Brian Fairey [SMTP:bfairey@...]
> Sent: Wednesday, September 22, 1999 9:01 AM
> To: CAD_CAM_EDM_DRO@onelist.com
> Subject: [CAD_CAM_EDM_DRO] Driver boards
>
> From: Brian Fairey <bfairey@...>
>
> I have a pair of stepping motor driver boards to give away these were
> mfg by NCR
> and I think were used to drive size23 mtrs. The baords are 10x5 and
> amounst other things has a pair of L6203 mounted on a heat sink.I may be
> able to obtain a schematic. You pay for shipping
> Brian,Ont, Canada.
>
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
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> bill,
> List Manager


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