GSM Gun Drill Properties
Gun drill is a specialized cutting tool in CNC deep hole drilling. GSM’s drilling tool has following properties.
Diameter range: 3 – 40mm
Overall length: 5000mm (maximum)
The rated grinding angle fits for drilling of the most of material. After using, through re-grinding can prolong the service life.
Gun Drill Types
Brazed Single Fluted Tool
Single fluted type is the most common type. And the most widely used.
Contains one-piece carbide drill bit and steel drill bit with carbide inserts.
The tube and shank are made of steel material. And through heat treatment.
The three parts are brazed to be a complete tool.
Tool With Coated Bits
This type of tool contains characteristics like high surface hardness, stable chemical properties, good anti-wearing ability, small friction coefficient and lower thermal conductivity, etc.
Compare with uncoated type, the cutting performance is 30% higher. The driling precision can be promoted to be grade 0.5~1. The consumption is 20%-50% lower.
Coating is normally by TiN,TiAN and AlCrN, etc.
Double Fluted Tool
Double fluted type has two symetrical flute. The cutting oil cycling system is the same with single fluted.
Because of limited chip space, the tool is only suiteble for material of easy processing and chip breaking.
Overall Length Calculation
Overall Length L=LA+W+LB+L2+H
L= total length of gun drill from end of shank to very top of bit
D= diameter of drill bit
LB=width of guide system
L2= minimum chip removing distance