[TheForge] followup on holes in saw blade- broken bolts andleft handed drills

[Tod Estes]

With bolts sheared off even with the cast iron block of my 95 jeep I  
made a really small chisel and with a small hammer I used the chisel  
to cut into the bolt  and backed out all three of the bolts.  I saved  
the chisel and did it again in 40000 mi.
With other broken bolts I have arced a welding rod to the broken end  
of bolt the heat helped and I bent the welding rod and twisted the  
bolt out.


Sent by coconut telegraph.

On May 16, 2010, at 17:27, "Jerry Frost" <akfrosty at mtaonline.net> wrote:

> Yeah, cutting a bolt out of a hole with a torch without damaging the  
> tapped
> threads can be done but it takes a lot of practice and not a little  
> luck.
> Torching a nut off a bolt without damaging the bolt's threads is  
> easy peasy
> by comparison. Torching a simple steel bolt out of a casting is the  
> easiest
> as cast iron doesnt torch cut easily so the threads survive better.
>
> Successfully torching a broken bolt out depends on some variables,  
> the main
> ones, after the skill of the person holding the torch of course,  
> being:
> depth of the bolt, diameter of the bolt and composition of the bolt.  
> Believe
> me it's just Soooo much easier to torch out a plain high carbon 1  
> 1/2" bolt
> that's only in half an inch than it is to attempt torching out a 3/8"
> Stainless Steel bolt that's in 1" or more. Former is darned easy,  
> latter is
> darned near impossible.
>
> If you use an oxy propane torch you can pierce a hole, let it cool  
> and chase
> it out with a HS drill bit. Use oxy acet and it'll impart enough  
> carbon to
> make it necessary to use at least a Cobalt or better bit. I have an  
> All
> States Oxy Propane torch and can attest from personal experience  
> that you
> can either drill out pierced holes or torch cut a piece and chuck it  
> up on a
> lathe, mill, etc. and use HS tooling without a problem. The downside  
> is the
> oxy propane torch will happily cut several layers of steel  
> simultaneously
> making the old cut the nut off the bolt without damaging the threads  
> trick
> really darned near impossible.
>
> Jer
> -------------------------
> If it ain't forged
> It ain't real
> wrought iron is
> The Frostworks
>
>
>
> ----- Original Message -----
> From: "Andy Gladish" <gladish at cablerocket.com>
> To: "Blacksmithing List Sponsored by ABANA" <theforge at mailman.qth.net>
> Sent: Saturday, May 15, 2010 6:30 AM
> Subject: Re: [TheForge] followup on holes in saw blade- broken bolts  
> andleft
> handed drills
>
>
>> I've heard that if a bolt is broken off in a cast iron casting, you  
>> can
>> take
>> a torch and blow it out, enough to redrill and tap.
>> Always wondered if that was theory or if it really works- tried it  
>> once
>> and
>> wasn't successful.
>> Andy
>>
>
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