Help! > Mistakes, muckups, and dangerous behaviour

Dreaded "tink" sound!

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Sky King:
In the process of building Elmer's #29 Mine Engine and had gotten down to the cylinder and  drilling all of the 19 holes required.
Well, all went just fine until the last hole,one of the steam passages, had only a few thou to go and "ting"!!! @#%^&%#@ bit broke!!  Tried every trick in the book and never could get it to budge. Beat it up so bad I just threw it in the mistake drawer and started a new one. This time I drilled the passage holes first!!
Yes I was "peck" drilling,,only about 20-25 thou at a time...

kvom:
Did you spot drill?

Sky King:
Yep, and even milled a 1/16" starter hole about .125" deep to keep bit from wondering out due to the angle.
It was very close to being all the way thru when it broke.  Left about 3/32" piece..

AOG:
What were you making the cylinder out of?

Tony

crueby:
Adding oil between 'pecks' helps.  Might just have been a dull bit?

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