[AJD] Drilling and Tapping

[Terry L. Hrdlicka]

Cal,

Cast is not that hard to tap.  Lots of oil and don't force it too hard. 
  You can try to run a tap through the stripped hole and see if you can 
clean it up enough to hold a bolt.  As for the broken one, you might 
want to try to punch a "dimple" as close to dead center as you can, soak 
it up good with PB Blaster or your favorite penetrating oil, and try to 
drill it out with a "left handed" drill bit a little smaller than the 
bolt.  A lot of times, you'll get half way through and the broken bolt 
will screw itself out.

YMMV

Terry (NØWJV)





wb5cys wrote:
> There is a small sheet metal plate that bolts underneath my tractor to 
> cover an opening which provides access to the flywheel.  The plate is 
> bolted to cast iron with two 1/2" cap screws.  One of the holes is 
> stripped and the bolt twisted off in the other.
> 
> How hard is it to drill and tap 50 year old cast iron?  I have no 
> experience with drilling and tapping, does it require special tools?
> 
> Thanks!
> 
> Cal B.
> Nacogdoches, Texas
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> 




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