|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Drilling Systems - Half Round DrillsThis three piece assembly consists of a solid carbide tip, an aircraft alloy formed tube shank, and a driver sized to allow maximum use of available toolholders. The off-center point configuration and hollow core allow the drill to achieve gun drill accuracies and/or very deep holes (up to 50X) on standard or CNC machinery.
The drill tip's outer and inner cutting edges cause chips to split into two separate coils. These coils converge upon themselves, breaking them up further into smaller pieces. Air pressure and lubricant from the spraymist unit clear the chips, forcing them back along the open side of the half round drill's flute section. Half round drills can be ordered by specifying drill diameter and flute length. Sterling Gun Drills has stock sizes available in diameters from 3/16" to 1 1/2", with flute lengths to 33". Metric, special diameter, special flute lengths and special drivers can be made to order. Standard drivers are supplied in three sizes. See the table below for details. Standard drills are supplied with our 20° x 15° nose grinds. Drills with special features are available to order; some examples include:  Double
carbide length for cross holes.Flat
bottomed for formed blind holes.Chip
breakers for very gummy materials.A complete range of toolholders are offered below, as well as spraymist kits, lubricants, reduction sleeves, and regrinding fixtures to complete a total deep and precision hole package!
The Half Round Drill - Setup Procedures(The same procedure can apply for "V" flute gun drills used with this system)The half round drill point position is offset to ¼ the drill's diameter. This does not allow the drill to start unless guided by either a guide bushing or a pilot hole. On conventional machinery, a pilot hole is usually the most practical. Should you have any questions regarding materials, speed and feed, machine application or operation, contact Sterling Gun Drills for assistance.
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
