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drilling systems from sterling gun drills









Regrinding Systems

Sterling : Regrinding Systems


Grinding

 Gun Drill N-8
Half Round Drill HA-1
Step 1) Position horizontal register at +30° , (half round drills at +20°), vertical register at +12°. Grind until all wear is removed.
Step 2) Position horizontal register at +29°, (half round drills at +19°), vertical register at +20°. Grind to establish the primary relief width of approximately 5% of the diameter.
Step 3) Position horizontal register at -20°, (half round drill at -15°), vertical register at +12°. Grind to establish the point position width of drill diameter. (Dia./4).
Step 4) Position horizontal register at 0°, vertical register at +25°. Grind front clearance until the triangle created reaches the rear edge of the primary relief.
Step 5) For gun drill only. Position horizontal register at -25°, vertical register at -12°. Grind until the triangle formed reaches the center of the tip "V".
Step 6) Remove drill and freehand a periphery chamfer around the radial surface at approximately 20°, stopping just short of the primary relief.

Printer Friendly - Grinding Instructions



DM-43 Sharpening System



Versatile, Convenient, Productive:


These words best describe the DM-43 sharpening system from Sterling Gun Drills. Designed as a compact, self-contained unit, it can easily be		 DM43
located next to work in progress, enabling operators to properly maintain gun drills and half round drills while remaining at their work stations. The DM-43 sharpening system services drills from .100" to .700" in diameter and comes complete with everything necessary to maintain and maximize tool life and efficient hole production. With the drill grinding table removed, a protractor table is revealed, allowing the resharpening of carbide inserts and lathe tools.

Standard Items Include:

DM43 standard items includedPortable grinding machine DM43 standard items includedWheel wrench
DM43 standard items includedProtractor and drill regrind tables DM43 standard items includedCleaning stick
DM43 standard items includedToolholder for gun drills and half round drills DM43 standard items includedSpray bottle
DM43 standard items included360 grit wheel DM43 standard items includedWetting agent
   
Resharpening: We have two styles of regrind fixtures available.
 
Sharpening System and Accessories
Part No. Description Part No. Description
DM-43 Sharpening system (120V, 60Hz) DM-44-05 Wetting agent 
concentrate
DM-43A Sharpening system (220V, 50Hz) DM-44-06 Spray bottle
DM-44-01 260 grit wheel (coarse) DM-44-07 Wheel cleaning stick
DM-44-02 360 grit wheel (standard) DM-43-08 Drill regrind plate 
and toolholder
DM-44-03 600 grit wheel (medium) DM-43-09 Drill regrind plate
DM-44-04 1200 grit wheel (fine) DM-43-10 Drill toolholder for DM-43



DM-41 Gun and Half Round Drill Regrind Fixture



 

The Sterling Gun Drills manual regrind fixture provides a fast and easy method of resharpening gun drills and half round drills with the popular facet style grind. Drills of a large diameter range are positioned and ground without the need of expensive bushings or collets. The universal nature of the fixture allows standard or custom regrinds.		 DM41
 

The Sterling Gun Drills DM-41 Gun Drill Regrinding Fixture Consists of Three Elements:

1) The Workhead with clamping device to hold either a single flute gun drill or half round drill in position.
2) A Scale, graduated in degrees, to allow the drill to be aligned in the vertical plane. This scale is mounted on the vertical member of the fixture that holds the workhead.
3) A Scale mounted on the diamond - shaped base of the fixture to allow the drill to be angled in the horizontal plane. This scale is graduated in degrees.

Both scales have locking levers to maintain vertical and horizontal positioning, and when used together allow compound angles to be ground on the nose of the drill mounted in the workhead.

The fixture is normally used on a tool and cutter grinder equipped with a 11V9 or 11A2 style diamond wheel (120 - 180 grit). Some may chose a metal or plated bond wheel with concentric roughing and finishing faces, the roughing face having a coarser grit than the finishing faces. The spindle of the grinding wheel will start at 90° to the table slideway.



TWINMASTERTWINMASTER® - Registered Trademark of Sterling Gun Drills Regrinding Information

TWINMASTER Regrinding

TWINMASTERTWINMASTER® - Registered Trademark of Sterling Gun Drills two flute drills can be resharpened many times, maintaining optimum performance. Used up drills or damaged drills with good tubes can be retipped. The grind can be reproduced on universal tool and cutter grinding equipment; this diagram shows basic geometries. Sterling Gun Drills offers regrinding services with next day turnaround.


Learn more about the TWNIMASTERLearn more about the TWNIMASTER TWINMASTER® - Registered Trademark of Sterling Gun Drills