Technology

Cutting-Edge Technology

Advancements through technology and process improvements have positioned Rocky Mountain Twist as the quality and performance leader of industrial drill bit manufacturing.

Until recently the process of grinding a drill bit from a solid high-speed steel blank has changed very little over the years. A drill bit produced using traditional manufacturing methods is ground in multiple remote operations within a batch. After each shaping operation the drill bits must be moved “manually” to the next machine or operation. This process is repeated until bits are completely ground. Herein lies the problem, each time a drill bit moves from one operation to the next, the bit is reoriented within a fixture. This constant reorientation can create variances of critical dimensions from one bit to the next. These variations in geometry translate to reduced performance and inconsistencies in hole size.

At RMT, each of our proprietary CNC drill grinding cells transform solid high-speed steel blanks into finished drill bits without leaving the cell or reorientation. Using revolutionary rotary methodology, a drill blank is oriented once then moves through each manufacturing phase in a precise computer controlled operation. This process innovation ensures the highest degree of repeatable, consistent manufacturing in the industry.

High-Tech Quality Assurance

Utilizing the latest advances in optic laser technology, drill bits are continuously measured against predetermined benchmarks. The moment the slightest change in drill geometry is detected, data is received into the cell automatically triggering the grinding wheels to be redressed. This allows RMT technicians to fine-tune the grinding process to meet optimum specifications and eliminate variations in geometry before they happen.

Impact/Hex Shank System

Impact/hex shank drill bits and power tool accessories are advancing as end-users transition from operating standard drill/drivers to impact tools. The ability for these accessories to withstand higher torque levels is the result of superior product engineering, and use of quality materials and manufacturing methods.

RMT manufactures a broad range of impact hex shank drill bits and power tool accessories. These accessories allow for fast and easy bit changes without re-chucking your power tool. Extremely durable, impact hex shank drill bits and driving accessories are rated for impact and standard drill/drivers, and compatible with quick change adapters.

 

Anatomy of a Drill Bit

Feeds and Speeds Chart

Drill Chart

Tap Reference

Tap Application Chart

Glossary

(A) TIP DIAMETER
Drill bit diameter at tip.

(B) SHANK DIAMETER
Drill bit diameter at shank end. Also includes 3/8" reduction diameter.

(C) DRILL LENGTH
The length of drill bit from shank end surface to the leading edge of the primary chisel. (measured at the outer diameter)

(D) TIP THICKNESS
Thickness of the web at the point. (unless another specific location is indicated)

(E) RELIEVED DIAMETER
Diameter of the drill bit body that has been cut away to minimize friction from the hole.

(F) MARGIN WIDTH
Width of the non-relieved portion of the major diameter of the drill bit.

(G) CHISEL ANGLE
Included angle between the chisel edge and the leading edge of the cutting lip, as viewed from the front end of the drill.

(H) SECONDARY CHISEL ANGLE
Included angle formed by the intersection of the cutting edge and the face of the notch with the relief surface of the point, resulting in partial removal of the primary chisel edge. (applies to split point geometry only)

(I) POINT ANGLE
The angle included between the cutting lips projected on a plain parallel to the cutting axis and parallel to the cutting lips. In form this angle resembles a cone, but it departs from a true cone to furnish clearance behind the cutting lips.

(J) LIP RELIEF ANGLE
The clearance angle of the cutting lips. Measured by projection onto a plain tangent to the periphery at the outer corner of the lip. The lip relief angle is usually measured across the margins of a twist drill.

(K) SECONDARY CLEARANCE ANGLE
The included angle generated from the clearance operation for the secondary cutting edge.

(L) FLUTE LENGTH
Length of heliocal flute measured from outer edge of cutting lip to back leadout edge of the flute.

(M) CUTTING LENGTH
Length of relieved diameter measured from outer edge of cutting lip to back lead out edge of the relieved diameter grind.

(N) WEB
The central portion of the body that joins the lands. Extreme end of the web forms the chisel edge on a two flute drill bit.

(O) LAND WIDTH
Peripheral portion of the body between adjacent flutes.

(P) RADIUS IN NOTCH
Clearance angle of the cutting lips. Measured by faster, more efficient chip removal

Hours

Monday8:00AM - 5:00PM
Tuesday8:00AM - 5:00PM
Wednesday8:00AM - 5:00PM
Thursday8:00AM - 5:00PM
Friday8:00AM - 5:00PM
SaturdayCLOSED
SundayCLOSED

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