"Trepanning" - The centerline drilling of larger diameter through holes producing a core - range from 2.500" diameter to 8.00" diameter through lengths of 10 feet.

The core produced is approximately 1.500" outside diameter under the size of the drilled hole diameter.

 

For shorter blind bottom hole rough drilling, we have a "Spade Drill" capability

Honing required for uniform size and surface finish

 

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