Deep-hole drilling 16xD - 30xD (after pilot drilling) Positioning Implementation Vertical machining Introduce the deep-hole drill with anti-clock

Deep-hole drilling 16xD - 30xD (after pilot drilling) Positioning Implementation Vertical machining Introduce the deep-hole drill with anti-clockwise rotation up to 0.5 xD before the end of the pilot hole, without internal coolant supply. Horizontal machining Position the cutting corners of the deep-hole drill vertically, at zero rotation introduce the drill into the hole as far as 0.5xD short of the end of the pilot hole. Drilling the deep hole Work without a drilling cycle (no chip evacuation necessary). Switch on the internal coolant supply, increase the rotational speed (as smoothly as possible) to the final working value vc. When drilling a through hole, approx. 1 mm before the deep-hole drill breaks through, reduce the vf speed. Breaking through obliquely and breaking through into cross holes reduce vf by 40 %. 4b. Deep-hole drilling 40xD - 50xD (after pilot and co-pilot drilling) Positioning Implementation Vertical machining Introduce the deep-hole drill with anti-clockwise rotation up to 0.5 xD before the end of the pilot hole, without internal coolant supply. Horizontal machining Position the cutting corners of the deep-hole drill vertically, at zero rotation introduce the drill into the hole as far as 0.5xD short of the end of the pilot hole. Drilling the deep hole When drilling deep holes 40xD/50xD, chip evacuation is necessary every3xD. (Perform chip evacuation by pulling the drill back from the bottom of the hole in cycles of not more then 3xD.) When drilling a through hole, approx. 1 mm before the deep-hole drill breaks through, reduce the vf speed. Breaking through at right angles Breaking through obliquely and reduce vf by 50 96. breaking through into cross holes reduce vf by 40 %. Backing out the deep-hole drill Before backing out the deep-hole drill switch off the internal coolant supply and then back out the drill optionally with or without reducing the drill speed (vf 1000). Safety instructions Deep-hole drills s 12x D may never be operated at vc max - without pilot hole guidance. Main catalogue Hoffmann Group 46 93 Backing out the deep-hole drill Before backing out the deep-hole drill then back out the drill optionally with Breaking through at right angles reduce vf by 50 %. switch off the internal coolant supply and or without reducing the drill speed (vf 1000). in 4 operations 4a.