drill feed

[′dril ‚fēd]

(mechanical engineering)

The mechanism by which the drill bit is fed into the borehole during drilling.

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References in periodicals archive ?

Excessive rotational speed or drill feed will cause the cutting forces acting upon the drill to be greater than they should be.

The basics of gundrilling rifle barrels: a little history on gundrilling and the use of modern machines and tools

When rotated at a high speed and pressed with high axial force into sheet metal or thin walled tube, generated heat softens the metal and lets the drill feed forward, produce a hole, and form a bushing from the displaced material.

Adding savings by subtracting chips: using friction drilling cut out chips and saved a shop time, money, and effort as well as improved safety

In drilling, this problem can be caused by using the wrong type of drill or a dull or incorrectly sharpened drill, or by an excessively light or slow drill feed, among other factors.

Cutting-edge plastics machining: there's an art to trimming, milling, and finishing plastics

The hydraulic system for operating drill feed is self-contained and includes an oil reservoir.

Drilling technology: makes short order of small runs

To improve visibility from the operator station, the drill feed has been mounted sideways on the boom.

Mining in Gabon

Difficulties were experienced in holding the vehicle steady at the ice face and controlling the drill feed thrust.

Moving an ice mountain

The rigs are equipped with Sandvik's RD314 high-frequency rock drill, while their telescopic drill feed offers versatility for development, bolting or short-hole production drilling.

Niche mining machines: despite the increasing importance of bulk-mining systems, there is still a significant market for equipment designed specifically to function in narrow-vein and low-height applications

As well as conventional bolting positions in arch-section and rectangular roadways, the drill feed can also move to any conceivable drilling angle in the drivage direction, as may be required for exploration and reinforcement work or additional blasting.

Roadheaders tackle hard rock at Turkish coal project

Changing from AISI/SAE low carbon mild steel at 20,000 psi tensile to stainless in the 70,000 to 120,000 psi range, alloy steels such as 4130 with 70,000 to 200,000 psi, or titanium alloys with 130,000 to 190,000 psi tensile, drill feed thrust increases almost directly by this tensile difference.

Getting to the point with small/micro drilling

The drill feed has a centralizer which collects and directs the drill cuttings to the mine floor.

Big Island trona mine

Positioning speed of 98 ft/min coupled with the two-speed spindle motor and 12"/min variable drill feed rate assure fast, accurate hole making.

Flexible machining systems & cells

A double rotation device allows the operator to position the drill feed vertically on both sides and close to the side walls.

Niche machines for narrow-vein mining: while the world's major mines focus on bulk extraction, narrow-vein deposits demand a different approach--and different equipment. E&MJ looks at some of the possibilities

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