[DeTomaso] Extracting broken bolts by EDM disintegration

[Tony DiGiovanna]

Unless I am missing something, seems cheaper and easier to find a Bridgeport
mill and an end mill....carbide if necessary.  EDM process interesting, but
seems like overkill for broken bolt removal.

-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of Jerry Knotts
Sent: Tuesday, November 04, 2014 8:18 PM
To: detomaso at poca.com
Subject: Re: [DeTomaso] Extracting broken bolts by EDM disintegration

Bill,

  EDM is really great.  The only drawback is you need to bring the part to
the EDM machine.  I had it used on removing broken and fully rusted bolts on
a couple of Gravely yard tractors.  At that time I worked in Houston in oil
field parts manufacturing and had to bring the tractor parts to the shop.
Set the machine up, packed the portion around the part to be removed with a
red rag soaked in salt water and let it run.  
Usually only a few minutes and it was done.  Sometimes left a bit of thread
in the bolt hole but was easily cleaned.

Wish I had one here at the farm.  Am working on a trimmer with steel bolts
in an aluminum trim body.

jerry knotts


On 11/4/2014 6:51 PM, Bill Lewis wrote:
>     HOT ROD Magazine for December 2014 - has an article about removing
>     broken bolts, bits, taps, etc., from metal objects with a machine
>     called an Elox "Electrical Discharge machine" (EDM), which was
>     originally built in the 1940's.  The process, "can non-invasively
>     vaporize the broken part, leaving the surrounding material unscathed."
>
>     ---------------------------------------------------------------------
>     If you are interested or need more info:  Jim's Tap Extracting
>     www.extractit.com       I am not familiar with this, but the word
>     "vaporize" really caught my attention.    ----BILL Lewis
>
>
>
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