Deep hole Fried Dough Twists drill
For pilot hole processing, use a drill bit with a sharp angle of 140 ° and a diameter tolerance of m7 to drill a pilot hole of 1.5xD~3xD depth;
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Use process
1. For pilot hole processing, use a drill bit with a sharp angle of 140 ° and a diameter tolerance of m7 to drill a pilot hole of 1.5xD~3xD depth;
2. Enter the guide hole and enter the position about 0.5~1mm from the bottom of the guide hole at low speed (speed 500~1000r/min-1, feed rate 0.2~0.3mm/r);
3. Deep hole machining, starting with the recommended cutting parameters (non step machining);
4. After drilling, reduce the speed to 500~1000r/min-1, retract the tool to the starting position at the appropriate feed rate (500~3000mm/min), and finally retract the tool with the same parameters as when entering the guide hole.
matters needing attention:
1. When the processing surface is inclined, it shall be spot faced first;
2. When machining cross holes or oblique through-holes, the rotation speed shall be reduced at the intersection and outlet.
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Deep hole Fried Dough Twists drill
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