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Drill Unit and Self Feeding Drill Glossary of Terms

A mechanical device capable of producing motion, i.e. AutoDrill’s Drill Unit has capability of both linear and rotary motion.
Term loosely used to represent compressed air sources for use in manufacturing.
The temperature and atmospheric conditions in the process area.

Clean Room

Applications characterized by the common requirement to minimize outside contamination. These type applications limit the use of lubricants and coolants or use lubricants and coolants that are safe for consumption, etc. Special materials and seal materials are often necessary to meet these requirements. Many medical and pharmaceutical applications require clean room features.
A tool holding device designed for maximum holding capacity and high accuracy. Each tooling size requires a separate collet.
Compressed Air
Industrial process air available for control and process uses at roughly 30 to 150 PSI but sometimes lower or higher depending on the application.
Counterbore (counter-bore)
The larger diameter at the entrance of a drilled hole with a flat bottom. Similar to a countersink except for the bottom configuration.
Countersink (counter-sink)
The larger diameter 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.
Deep-Hole Drilling
Arbitrarily set at a depth to hole diameter ratio of 8:1 or greater. The torque required is generally more than shallow depth drilling and frequent tool retraction may be necessary to keep the flutes open. This tool retraction is known as peck drilling or PeckFeed.
DRAP (drill-tap)
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.
Drill Unit
A self-feeding drill module that is designed to automate multiple hole production drilling and other rotary/linear applications.
Double Feed Control
The ability to control the feed rate for both the extension and retraction portions of the drilling cycle.
Extended Rear Spindle
Additional length 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 situations where you need to attach something to the rear of the unit for various reasons. Some machine builders working directly with AutoDrill have manufactured Lead Screw Tap Tappers for our customers.
The linear extension towards the work of a Drill Unit quill.
Feed Control
The method to control the drill extension towards/into the work. The simplest but least precise method is pneumatic control. Another method is hydraulic feed control, which has a more accurate feed rate because of the incompressibility of oil.(i.e. oil does not compress under pressure)
Flow Control
A precision adjustable valve used to control the flow of a gaseous or liquid media.
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.
Gun Drilling – See Deep-Hole Drilling
Jacobs Taper
A standard shaft configuration that allows attachment of tool holders with minimal runout. Standard Jacobs Taper sizes are J0, J1, J2, J3, J33, J4, J5, J6
Multiple Spindle Head (Multi-Drill, Gang Drill, Spindle Multiplier)
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. These devices can be mounted onto automatic drill units, drill presses, column drills, pillar drills, milling machines, CNC platforms, direct motor mounts and many other platforms.
Pounds per Square Inch, a measure of the energy stored in industrial compressed air or any other energy force.
Parabolic Drill
Drill designed for deep-hole drilling with good chip evacuation.
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.
The linear guided, non-rotating portion of a Drill Unit or drill press. Its purpose is to securely support the rotating spindle. It is also often used to secure a multiple spindle head.
Rotary Union
A mechanical device that allows the transfer of a medium (air, water, other coolant, lubricant, etc.) from a stationary source to a rotating component.
Runout (run out, run-out)
The deviation from the desired surface or line in relation to the axis during one complete revolution.
A Drill Unit that includes the ability to turn and extend in a compact package.
Self-Feeding (selffeeder, selffeeding, self-feeding)
The capability to automatically extend a drilling, tapping, reaming (etc.) device towards the work. The ability to automate a drilling (etc.) process.
Skip Feed Control
A control valve option available on AutoDrill series 2000 and 5000 Drill Units that allows multiple uncontrolled and controlled sections of the feed cycle. The valve essentially “skips” the feed control at desired portions of the feed cycle. Available in custom fixed models or even fully adjustable models, this device significantly speeds up the cycle time when drilling hollow pipe, tube, extrusions, etc.
The high precision shaft that rotates within the quill and is the attachment point for the tooling or tool holder.
Spline Bushing
The part of a Drill Unit that transfers power from the input shaft or device to the spindle.
Thru-holes (through holes)
The hole drilled thru the spindle center (through spindle) to facilitate the introduction of coolant, lubricants, air or other media to the work area. It is also useful for the introduction of a work or slug ejector pin.
When used as a drilling parameter it is the exertion forces of a tool into the work transmitted by the Drill Unit.
Total Indicator Reading is the total movement of a dial indicator for the deviation of a surface from it’s theoretical perfect dimension. In drilling, it is an indication of the deviation of the cutting tool’s centerline axis from it’s theoretical true centerline. (center line)
Two-Hand Anti-Tie-Down (Two Hand Anti-Tiedown)
A safety arrangement suited for machinery where position of an operator’s hands must be monitored. Operator must actuate both push buttons simultaneously to obtain an output signal and thus start a potentially dangerous equipment process.

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