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drilling systems from sterling gun drills



Resharpening
 

Three styles of regrind fixtures are available from Sterling.

Gun Drills

DM-41 and DM-42: A regrind fixture for tool and cutter grinding machines for drills from 4 to 54mm.

DM-43: A machine complete with the toolholder and diamond wheel for drills from 2.5 to 18mm.

Either style of regrinding fixture can be used to re-sharpen gun drills and half round drills, or, use Sterling Gun Drills’ re-sharpening service with fast turnaround.


DM-43
This machine comes complete with the toolholder and diamond grinding wheel.

More about the DM-43More about the DM-43		 DM43
   
DM-41 and DM-42 - Sterling Gun Drills DM-41 and DM-42
A regrind fixture for tool and cutter grinding machines.

More about the DM-41More about the DM-41
More about the DM-42More about the DM-42

DM-41 literature Download the DM-41 Literature.
DM-42 literature Download the DM-42 Literature.

Either style of regrinding fixture can be used to resharpen half round and/or single flute drills, or take advantage of Sterling Gun Drills' resharpening service with fast turnaround. (See also the Regrinding Section.)
Resharpening: We have two styles of regrind fixtures available. DM-41 and DM-42 - Sterling Gun Drills
DM-41 and DM-42 - Sterling Gun Drills

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		 DM43
be 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 and DM-42 - Sterling Gun Drills
resharpening service

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.

Regrinding Instructions for Standard Nose Grinds:
Initial Setting
  • Place the fixture on the table of the machine. The base of the fixture has two through slots that clamp the base to the table. Install two through bolts but do not tighten. Position the horizontal (base) register at zero. Indicate front face of the fixture zero to the table movement then tighten the through bolts.
  • Select the appropriate clamping blade for the drill type. The angled blade is to “V” flute gun drills, ensuring the “F” mark on the blade is toward the front. The flat blade is for half round drills. Store the unused blade on the tapped hole provided on the base.
  • Slide the gun drill or half round drill under the blade clamp and forward of the “V” base. Lock in position on the tube only with the carbide tip fully clear of the base and blade clamp. With both horizontal and vertical scales set at zero, the drill’s flat cutting surface should be parallel to the table.
  • Grind the drill by following the steps outlined for the most common grinds. Custom nose grinds can be ground to your requirements. It is recommended that a suitable dust collection system is used. A cold gun or spraymist is recommended for large diameters.
resharpening service


DM-42 Sharpening Head for Gun Drills up to 2 1/8” Diameter

 

Sterling Gun Drills, Inc. announces a new sharpening head for single flute gun drills to increase the range of our Manual Regrind Fixtures to over 2 1/8" (54mm).

Part # DM-42 Large Manual Sharpening fixture has a range of .75” (19mm) to approx.
2 1/8” (54mm), and is offered complete with the base assembly.

Part # DM-42-A, Large Sharpening Head, is offered as an option* for the DM-41 Manual Regrind Fixture.
DM42
 


No additional collets or adapters are necessary to sharpen single flute gun drills of any manufacture with the popular “facet” nose grind to virtually any configuration required.

* Price for the DM-42 with DM-41-A "standard" Sharpening Head is $2595.00. Price of the DM-41-A "standard" Sharpening Head alone (diameter range .16” – 1.25”, 4 – 32mm) is $895.00. Price of DM-42-A "large" Sharpening Head alone (diameter range .75” – 2.1/8”, 19 - 54 mm) is $1075.00.

Changeover of the standard sharpening head DM-41-A to the DM-42–A large sharpening head on the base fixture involves just two screws to swap the vertical register from the standard fixture to the large fixture.

Due to variation in flute shape from size to size and from one manufacturer to another, a fine adjustment feature is built into the clamping wedge that allows leveling the cutting face on gun drills with flute angles from 105º - 120º. A 1/8” hex key is furnished for this purpose.

Existing sharpening instruction is suitable for all diameters.

Part# reference

DM-42 Manual Regrind Fixture (large) DM-41 Manual Regring Fixture (std.)    
DM-42-A Head Assy. (large) DM-41-A Head Assy. (std.)    
DM-42-B Base Assy.     
DM-42 + DM-41 A Head assy. Includes the "large" fixture base assy., large head, and standard head allowing gun drill sharpening from .156 (4mm) to 2.125" (54mm).    

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Drilling Systems:
Gun Drills | Half Round Drill | Spraymist Kits | Stationary or Rotary Toolholders | Resharpening

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