Re: Bolt broke off Inside Hole

[Doug J <63sprtfury@xxxxxxxxx>]

If all else fails, get a carbide endmill, maybe 5/16 inch.  Chuck that up in your drill and do your best to keep it straight.  That WILL get thru.  I've used them at work to get thru broken drill bits in work pieces including carbide .  You'll kill it and they are expensive, but you only need it once anyway.

On Mon, Feb 23, 2015 at 3:09 PM, Donald Gallimore <dongallimore@xxxxxxx> wrote:

Picked up Cobalt bits today at a machine shop supply house.  Left hand thread and new so if that doesn't work, sadly, it's "off with the head", as somebody already said.

Did try to drill some C channel scrap Saturday with the bits I tried to use on the bolt.  The didn't dent the metal.

 

Akron Don Gallimore

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From: Richard Kinsley <leroar.kinsley058@xxxxxxxxx>
To: 1962to1965mopars@xxxxxxxxxxxxxxxx
Sent: Monday, February 23, 2015 3:45 PM
Subject: Re: Bolt broke off Inside Hole

Of course using a cutting lubricant such as Rapidtap is always a good idea and makes it much easier. Even WD40 is better than nothing

On Feb 23, 2015 2:42 PM, "'Paul L. http://1962to1965mopar.ornocar.org/ml-le' via The 1962 to 1965 Mopar Mail List Clubhouse" <1962to1965mopars@xxxxxxxxxxxxxxxx> wrote:

If you're questioning how sharp you drill bits are just try drilling into a piece of scrap piece of steel on your workbench and see what happens.  It is quite possible that the bolt you are trying to drill is a grade 8.   In that case you're going to need a really good bit as MO suggested.  Also use that centerpunch as others have suggested.  When using an easy out make sure that the hole is undersized enough so that you have to drive the easy out into the hole with a light hammer.

Paul L.

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Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email address. This practice will protect your privacy, reduce the total volume of mail and fine-tune the content signal to Mopar topic. Thanks!
 
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