Carbide Gundrill Blanks, Carbide Rotary Burr,Carbide Inserts For Metalworking Industry
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Solid Carbide Gun Drill
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Solid Carbide Gun Drill

Quantity:
  • D1.4~D40*3500
  • Konetool

Gundrilling is a deep-hole drilling process.
The process prouduces deep, one-pass, high quality holes. In gundrilling, the cutting speed is high and the feed rate is retatively slow, but the penetration rate is higher than that of a twist drill. The method allows the tool to drill the full length of the deep hole without retraction.

gundrill

In the method, cutting fluid is injected with high pressure through the hollow shank. Once the fluid has lubricated the cutting edges of the tip, it escapes along the V - shaped flute of the shank, taking the chips out of the hole.

A gun drill needs guidence in the begining of the drilling. When gundrilling in an CNC machine, a pilot hole is used to guide the drill. Drill manufacturers usually recommend the use of a lower feed at the begining of the drilling and raising the feed after the drill tip has penetrated the material.

pilot hole



1.1 Shank and driver

The cross-section of the shank is V-shaped with coolant holes. It is made of hardened steel 42CrMo or 30CrMo, that is highly resistance to twisting. This cross-section provides the optimal conditions for twist resistance, coolant flow and chip evacuation.
 
Drill head and shank should follow excellent coaxiality. Otherwise, shank and wall of hole would rub against each other to cause drill head deviating in direction. The joint part of drill head and shank design to 60° angle shape or 90°flat-bottomed shape, to ensure strong torque of shank.

Driver joint with shank and machine to transmit torque, feeding force, also coolant liquid to the drill head. Outside diameter of driver have to follow excellent coaxiality with shank, and be big enough to tighten up.

gun drill driver




1.2 Repair services
 
Repair service for tools helps you save on resources and costs.

 
The following services are available:

 
1.2.1 Re-sharpening tools

All deep hole drilling tools sharpened, including to customer specifications, on ultra-modern grinding machines.

 
1.2.2 Re-tipping carbide head

Possible if driver and shank are usable.

regrind carbide head


1.2.3 Re-tipping carbide head and steel shank

Possible if driver are usable.
repair gundrill


1.3 Popular dimension
 
Usually follow dimensions as below. Other grades, dimensions or engineering drawings upon request.

Dia. * L [mm] Dia. * L [mm] Dia. * L [mm] Dia. * L [mm]
Ф3*700   Ф8*200   Ф9.2*360   Ф14*900  
Ф4.02*1000 Ф8*245   Ф10*260   Ф14.02*1200
Ф4.02*800   Ф8*330   Ф10.02*1200 Ф15.02*1600  
Ф4.05*255   Ф8*335   Ф10.02*1400 Ф16.02*1200
Ф5.02*1000   Ф8*380   Ф10.02*1600 Ф18*720
Ф5.02*1200   Ф8.0*330 Ф10.15*500 Ф20.02*1200
Ф5.8*600Z3 Ф8.02*1200 Ф10.7*260 Ф22.9*850
Ф6*200 Ф8.02*1400   Ф10.7*700 Ф23*540
Ф6.02*1000   Ф8.02*1600   Ф10.7*800 Ф28*900  
Ф6.02*1200   Ф8.02*580   Ф11*460    ...
Ф6.02*1400   Ф8.6*780 Ф11*670  ...
Ф6.02*200   Ф8.6*900 Ф11*850  ...
Ф6.187*450 Ф8.7*1050 Ф11.5*550  ...
Ф7.02*1200   Ф8.7*260   Ф12*1400    ...
Ф7.02*750   Ф8.7*650   Ф12*260
Ф7.4*760   Ф8.7*800   Ф12.02*1650  
Ф7.8*1200 Ф9*600 Ф12.735*350
Ф7.84*1200 Ф9.12*580 Ф13.5*1400


deep hole drilling


1.4 Cutting Data
 
The cutting speed and feed settings depend on the following: tool length, cooling lubricant, workpiece material, stability of the machine parts and workpiece clamping. All the data above are standard values.
 
 
D Rev Feed - S50C Feed - P20 Feed - NAK80
[mm] [rpm] [mm/min] [mm/min] [mm/min]
Ø3.02 2400 - 2600 18 - 24 12 - 21 9 - 15
Ø4.02 2100 - 2300 21 -30 15 - 28 12 - 21
Ø5.02 1900 - 2100 24 - 35 18 - 28 15 - 24
Ø6.02 1800 - 2000 28 - 45 21 - 32 18 - 28
Ø7.02 1500 - 1700 32 - 50 24 - 32 21 - 32
Ø8.02 1400 - 1600 40 - 70 28 - 50 24 - 36
Ø9.02 1300 - 1400 60 - 90 32 - 50 28 - 40
Ø10.02 1200 - 1400 80 - 120 36 - 60 32 - 45
Ø11.02 1100 - 1300 80 - 120 36 - 60 32 - 45
Ø12.02 900 - 1100 70 - 110 36 - 60 30 - 40
Ø13.02 800 - 1000 60 - 80 32 - 50 28 - 36
Ø14.02 700 - 1000 45 - 70 28 - 45 24 - 32
Ø15.02 600 - 900 40 - 60 24 - 40 24 - 32
Ø16.02 600 - 800 40 - 60 21 - 40 21 - 32

    we are quite confident on offering guarantee on our product and services by emphasizing carbide cutting inserts and tools for modern industries.

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