Home
What's new
Latest activity
Authors
Store
Latest reviews
Search products
Forums
New posts
Search forums
What's new
New posts
New listings
New products
New profile posts
Latest activity
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
Cart
Cart
Loading…
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Search titles only
By:
Menu
Log in
Register
Navigation
Install the app
Install
More options
Change style
Contact us
Close Menu
Forums
Cobra Forums
SN95 Cobras
Broken crank bolt extraction
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Metal Head" data-source="post: 13648850" data-attributes="member: 135015"><p>That recess is going to be the only thing that may save you. Your only shot at getting that hole back on center is using a drill bushing and trying to drill with an endmill. A drill bit is going to try to follow whatever hole is already there and will just end up breaking even if using the drill bushing. An endmill will cut straight regardless and you need the bushing to keep you centered since you are forced to do it by hand. </p><p></p><p>Buy a couple high speed steel "HSS" endmills. Carbide is too brittle and will chip since your setup will not be rigid so don't bother with it. You'll need a drill capable of low speeds, you won't want anything over 500rpm or so. Stop and blow the chips out often. Endmills do not pull the chips out as well as a drill bit. Use some sulfuized "dark thread cutting oil." You can get it at Home depot in the plumbing section for threading steel pipe. </p><p></p><p>Once your endmill drilled hole is deeper than your ****ed up hole you can start drilling with a drill bit again to speed up the process. <strong>Do not do anything else until you get a bushing to keep you on center. </strong>That first hole you tried to drill is beyond saving by hand, grinding, or straightening with a drift.</p><p></p><p>You probably need to tow it to a machine shop so they can turn up some drill bushings as needed. I wouldn't bother with an auto repair shop, 99% of mechanics will end up ****ing it up worse. </p><p></p><p>I am a machinist by trade.</p></blockquote><p></p>
[QUOTE="Metal Head, post: 13648850, member: 135015"] That recess is going to be the only thing that may save you. Your only shot at getting that hole back on center is using a drill bushing and trying to drill with an endmill. A drill bit is going to try to follow whatever hole is already there and will just end up breaking even if using the drill bushing. An endmill will cut straight regardless and you need the bushing to keep you centered since you are forced to do it by hand. Buy a couple high speed steel "HSS" endmills. Carbide is too brittle and will chip since your setup will not be rigid so don't bother with it. You'll need a drill capable of low speeds, you won't want anything over 500rpm or so. Stop and blow the chips out often. Endmills do not pull the chips out as well as a drill bit. Use some sulfuized "dark thread cutting oil." You can get it at Home depot in the plumbing section for threading steel pipe. Once your endmill drilled hole is deeper than your ****ed up hole you can start drilling with a drill bit again to speed up the process. [B]Do not do anything else until you get a bushing to keep you on center. [/B]That first hole you tried to drill is beyond saving by hand, grinding, or straightening with a drift. You probably need to tow it to a machine shop so they can turn up some drill bushings as needed. I wouldn't bother with an auto repair shop, 99% of mechanics will end up ****ing it up worse. I am a machinist by trade. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Cobra Forums
SN95 Cobras
Broken crank bolt extraction
Top