Find the right speeds and approaches for gun drilling in metalworking. Enter the series number of Guhring tool for control the speeds and approaches. At machines for gun drills, the charts commonly show information about oil pressure, GPM values and maximum freely backing drill length.
In those processes you uses drills, end mills, taps, thread mills, grooving systems, reamers, tool holders, countersinks and deburring tools. Some services bid also tool management and repair of tools.
How to Set Speeds and Feeds for Gun Drilling
Count apt values form nucleus of the work. RPM you find by means of the formula: (SFM × 12) ÷ (π × drill diameter in inches). Other variant is SFM = 0.2618 × drill diameter × RPM.
For inches in minute counts: IPR × RPM. In calculators for CNC programs you find gun drilling computations for approach, pace, cycle time and coolant pressure. Like this you reach optimum speeds and approaches helped by RPM formulas and charts.
Feed rates and speeds range according to drill size and material. For instance, approach matches 0.001 inches per revolution for every 1/16-inch of diameter, plus/minus 0.001 inch entirely. Speed reaches 80 surface feet in minute in materials in 100 Brinell hardness.
For every additional 50 Brinell points reduce the pace in 10 surface feet in minute. Approach per revolution depends of diameter and material hardness. For 3 mm drill it is typical 0.04, for 6 mm drill 0.10, and for 10 mm drill 0.18.
Using a single-lip gun drill require special starting method. Enter the hole in low 100 RPM with reverse spindle, high approach and coolant. Later switch to right rotation and speed with coolant.
Use half approach, later pass to full. At launch in guide hole slow revolutions down and use high approach, until the drill head are entirely backed. An accurately machined guide hole match or surpass built guide hole, because it is concentric with the spindle center line.
Drill a pilot hole for additional security. Preserve good coolant flow. With mist instead of high pressure reduce approaches in 60 %.
For little holes higher pressure matters.
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