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Due to its single cutting edge, the gundrill requires support during initial entry into a workpiece. In fact, until the bearing area of the tip has started to enter the workpiece, the tool cannot guide itself. Therefore, either an accurate predrilled hole must be provided in the workpiece or a starting bushing must be supplied. The starting bushing must be in direct rigid contact with the workpiece to avoid the possibility of chip interference. The bushing is mounted in the front wall of the chip box. It should be no more than .0002" (.005 mm) larger than the gundrill diameter. Normally, bushings are made of hardened steel. However, carbide lined or solid carbide bushings are available from Drill Masters-Eldorado. The coolant seal is a round disc that fits securely over the gundrill shank and rides inside the chip box. This seal prevents back feeding up the flute by containing the coolant and chips. Alternatively, some machines are equipped with a coolant seal which mounts on the back end of the chip box, away from the drill point.

Resharpening Diamond Wheels in 400, 300 or 220 grit are available in configurations for drills .055" (1.397mm) to 1.000" (25.4mm) and 1.000" (25.4mm) to 2.000" (50.8mm).
Drill Guides of molded vinyl provide relief from whipping and bowing for higher speeds with less vibration. Sizes run from 0.070" (1.778mm) to 2.18" (55.372mm).
Filter Bags with 5 and 15 micron filter elements for filtration systems prevent large chips from returning to the tank.
Canister Filters with 5 and 15 micron filter elements trap finer particles in filtration systems. 5" (127.5mm) OD x 12.4375" (315.9mm) OAL x .78125" (19.843mm).
Chip Deflectors of polypropylene in sizes, 078" (1.98mm) to 2.000" (50.8mm) keep oil and chips in the chip box.
Gundrill Liners (GDL)
A gundrill liner is installed in the gundrill machine's chip box and is perfectly aligned with the spindle. The specified size GDI is inserted into the GDL and allows for precise accuracy for the tool to enter the material.
Gundrill Inserts (GDI)
A gundrill insert is required on all conventional gundrill machines from .0550" (1.397mm) through .7500" (19.05mm) and the tolerance is + .0002" (.0051mm) and - 0. It is used to guide the tool into the material providing sufficient rigidity to prevent the carbide tip from chipping and to insure consistent run-out from hole to hole. The insert is replaced once it becomes oversized due to usual wear or from tool breakage. It is recommended that the drill bushing is replaced once it is.0005 " over the drill size otherwise inconsistent drift or tool chipping may occur.
Gundrill Bushing (GDB)
A gundrill bushing is installed in the gundrill machine's chip box and is perfectly aligned with the spindle. It is used for diameters over .7500" (19.05mm) replacing the GDI & GDL to support the tool into the material providing sufficient rigidity to prevent the carbide tip from chipping.


Single Flute Gundrills
Stock Drills
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Step Drills
Two Flute Gundrills
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Complete Sharpening Package
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© Drill Masters Eldorado Tool
336 Boston Post Road, Milford, CT 06460 USA
Tel: 203-878-1711 / 800-658-8855
Fax: 203-878-6156 / 800-682-3003



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