Blue Demon Co. Inc.
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- Blue Demon - Model BDA - Drill Head
Blue Demon - Model BDA -Drill Head
The BDA brings all the advantages of the Blue Demon BD to air drilling. It`s a specially designed tool that substantially increases penetration rates and reduces costs in soft to medium rock formations. When compared with ordinary drill heads with rotating bits, the BDA will cut up to twice the footage daily in soft shales, clays, shells, soft limestone, red beds and other rocks of low compressive strengths.
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- "Step" drilling pattern for fastest penetration.
- BD-2 Bits.
- Twin bits on outer surface for added protection.
- No independent moving parts to become clogged.
- Requires only a moderate weight for full effectiveness.
- Precision machined head.
- Durable, trouble-free.
- 6 sizes for drilling holes from 4½" to 1015/16".
- Choice of 23/8", 27/8", 3½" and 4½" API shanks. Other threaded shanks on request.
Cutaway sketch of step drilling pattern as cut by Blue Demon BD and BDA Drill Heads. Lead bit drills 1½" hole. It is followed by other bits that shear and ream final hole size. Bits are set at an angle to assure fastest penetration without scaping, chipping or gouging