Gun drill in machining center

1. Make a guide sleeve when drilling the guide hole: the depth of the guide hole is 1.5 times to 2 times bigger than its hole diameter, the tolerance is 0.01mm to 0.02mm bigger than the gun drill.

2. Drill the center hole: before drilling, the gun drill should fix. When supply the cutting oil, feed and drill to process the center hole.

3. When start drilling, feeding and rotating at the same time.

4.Finish drilling: draw back quickly, stop at the position of guide hole. Stop the rotary and coolant, workpiece finish processing.

If any more question, please feel free to contact us.

Email: gsmsxoffice@gmail.com