Drill Unit Glossary

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Terms and definitions

Actuator

A mechanical device capable of producing motion, i.e. Blackalloy's Drill Unit has capability of both linear and rotary motion.

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Air

Term loosely used to represent compressed air sources for use in manufacturing.

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Ambient

The temperature and atmospheric conditions in the process area.

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Blackalloy

The name is associated with industrial cutting operations for more than half a century, and with precision Drill Units for over 20 years.

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Clean Room

Applications are characterized by the common requirement to minimize outside contamination. These types of applications limit the use of lubricants and coolants. Special materials and seal materials are necessary to meet these requirements. Many medical and pharmaceutical applications require cleanroom features.

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Collet

A tool holding device designed for maximum holding capacity and high accuracy. Each tooling size requires a separate collet.

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Compressed Air

Industrial process air is available for control and process uses at 30 to 150 PSI.

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Counterbore

The larger diameter is at the entrance of a drilled hole with a flat bottom. Similar to a countersink except for the bottom configuration.

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Countersink

The larger diameter is at the entrance of a machined hole with a conical bottom. Similar to a counterbore except for the bottom configuration. The general use of a countersink is for use with flat head screws and bolts.

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Deep-hole Drilling

Arbitrarily set at a depth/hole diameter ratio of 8:1. The torque required is generally more than shallow depth drilling and frequent tool retraction may be necessary to keep the flutes open.

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Double Feed Control

The ability to control the feed rate for both the extension and retraction portions of the drilling cycle.

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DRAP

A combination drill and tap that performs both operations in one sequence. It is useful for applications where the drilling and tapping settings are similar. The operation must be on a thru-hole part since the drilling must be finished before the tapping operation begins. Call for more information.

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Drill Unit

A self-feeding drill module that is designed to automate multiple hole production drilling and other rotary/linear applications.

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Extended Rear Spindle

Additional length is added to a Drill Unit spindle to allow the input of liquid or gaseous media thru the center of the spindle. The additional length is usually required to connect a rotary union to the spindle. The extended spindle can also be useful in heavy-duty applications to increase the life of the spline bushing.

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Feed

The linear extension towards the work of a Drill Unit quill.

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Feed Control

The method to control the drill extension towards/into the work. The simplest method is pneumatic control. Another method is hydraulic feed control, which has a more accurate feed rate because of the incompressibility of oil.

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Flow Control

A precision adjustable valve is used to control the flow of a gaseous or liquid media.

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FPR

Abbreviation for Feed per Revolution, a term used in drilling applications to determine how fast the drill will go thru the material per revolution of the cutting tool. It is a major factor in determining the horsepower requirements for an application.

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Gun Drilling

See Deep-hole Drilling.

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Jacobs Taper

A standard shaft configuration that allows attachment of tool holders with minimal runout.

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Multiple Spindle Head

A Drill Unit attachment with multiple drill or tap spindles where the spindles are gear driven from the Drill Unit spindle. They allow drilling or tapping of multiple holes in closer proximity than is possible with Drill Units alone.

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Parabolic Drill

Drill designed for deep-hole drilling with good chip evacuation.

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Peck Drilling

A technique where the tool is frequently retracted from the hole to clear drill chips and prevent clogging. It's also used to help drill straight precision holes. Generally used when the hole depth is considered to be a deep hole.

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PSI

Pounds per Square Inch, a measure of the energy stored in industrial compressed air or any other energy force.

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Quill

The linear guided non-rotating portion of a Drill Unit. Its purpose is to securely support the rotating spindle.

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Rotary Union

A mechanical device that allows the transfer of a medium (air, water, coolant, etc.) from a stationary source to a rotating component.

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Runout

The deviation from the desired surface or line in relation to the axis during one complete revolution.

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Self-Contained

A Drill Unit that includes the ability to turn and extend in a compact package.

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Self-Feeding

The capability to automatically extend a drilling device towards the work. The ability to automate a drilling process.

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Skip Feed Control

A control valve option is available with Models 151/251 Drill Units that allow multiple uncontrolled and controlled sections of the feed cycle. The valve essentially 'skips' the feed control at desired portions of the feed cycle.

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Spindle

The high precision shaft that rotates within the quill and is the attachment point for the tooling.

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Spline Bushing

The part of a Drill Unit that transfers power from the input shaft to the spindle.

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Thru-Holes

The hole drilled thru the spindle center to facilitate the introduction of coolant and other media to the work area. It is also useful for the introduction of a work or slug ejector pin.

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Thrust

When used as a drilling parameter it is the exertion forces of a tool into the work transmitted by the Drill Unit.

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TIR

Total Indicator Reading is the total movement of a dial indicator for the deviation of a surface from its theoretical perfect dimension. In drilling, it is an indication of the deviation of the cutting tool's centerline axis from its theoretical true centerline.

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Trilobe

Trilobe is a superior polygon profile designed to eliminate the common failures associated with splines and keyed shaft attachment methods. It is used for mechanical connections that are stronger, more precise, and have a substantially longer service life than other common methods. The trilobe profile is self-centering, a property important in maintaining minimum spindle runout.

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Two-Hand Anti-Tie-Down

A safety arrangement suited for machinery where the position of an operator's hands must be monitored. The operator must actuate both push buttons simultaneously to obtain an output signal.

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