[DeTomaso] Extracting broken bolts by EDM disintegration

[B Hower]

Back in the early 70s I worked field service in the semiconductor industry. Some of the equipment I worked on used anodized 6061 aluminum parts and assembled with SS machine screws. Customers were always breaking off screws in some of these parts. They would at times try to remove them...normally without real success. They would drill and tap a new hole next to original etc. They would call on me to bail them out many time also. I would take the part to a machine shop and have use EDM. It would salvage a $145 part and they charged me $6 dollars. I didn't have to worry about my damaging a customers part. I was great.
 
     From: Tony DiGiovanna <tonydigi at optonline.net>
 To: detomaso at poca.com 
 Sent: Tuesday, November 4, 2014 7:28 PM
 Subject: Re: [DeTomaso] Extracting broken bolts by EDM disintegration
   
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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>
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-------------- next part --------------
   Back in the early 70s I worked field service in the semiconductor
   industry. Some of the equipment I worked on used anodized 6061 aluminum
   parts and assembled with SS machine screws. Customers were always
   breaking off screws in some of these parts. They would at times try to
   remove them...normally without real success. They would drill and tap a
   new hole next to original etc. They would call on me to bail them out
   many time also. I would take the part to a machine shop and have use
   EDM. It would salvage a $145 part and they charged me $6 dollars. I
   didn't have to worry about my damaging a customers part. I was great.
     __________________________________________________________________

   From: Tony DiGiovanna <tonydigi at optonline.net>
   To: detomaso at poca.com
   Sent: Tuesday, November 4, 2014 7:28 PM
   Subject: Re: [DeTomaso] Extracting broken bolts by EDM disintegration
   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:[1]detomaso-bounces at poca.com] On Behalf Of Jerry
   Knotts
   Sent: Tuesday, November 04, 2014 8:18 PM
   To: [2]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
   >
   >
   >
   > _______________________________________________
   >
   > Detomaso Forum Managed by POCA
   >
   > DeTomaso mailing list
   > [3]DeTomaso at poca.com
   > [4]http://poca.com/mailman/listinfo/detomaso_poca.com
   _______________________________________________
   Detomaso Forum Managed by POCA
   DeTomaso mailing list
   [5]DeTomaso at poca.com
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References

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   3. mailto:DeTomaso at poca.com
   4. http://poca.com/mailman/listinfo/detomaso_poca.com
   5. mailto:DeTomaso at poca.com
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