about how to solve gundrill machining problem
As you know, we have to face some gundrill machining prolem, this article will give you some suggestion about how to solve gundrill machining problem .when you meet below problem at using gundrill machine, you can see below list:
| Problem | Reasons |
| Hole degree of deviation is very bad. | Workpiece not positioned or fixed well.Drill guide is not suitable, big space between the drill guide and gun drill No good support for the gun drill shank.Workpiece structure is not good, such as workpiece wall thickness is too big, and material issue such as not even. |
| Hole roughness too bad | Main spindle rotating speed, feeding rate is too slow.Cutting oil is not suitable; Pressure is low, flow is low, oil temperature is too high.Cutting oil filtering result is not good.Cutting tool is over worn.Machine vibrating; workpiece is not fixing steadlily. |
| Hole diameter is larger. | Drill guide is not used well, workpiece positioning and holding are not correct. Big space between the drill guide and gun drill. Drill tool tip grinding angle is not correct. |
| Trumpet hole | Big space between the drill guide and gun drill. Drill guide rigidity is not enough. |
| Gun drill life is short or tip is chipping. | Main spindle rotating speed & feeding rate is too low or too high. Have to choose suitable parameters. Drill tool tip grinding angle is not correct.Gun drill type is not correct.Cutting oil is not suitable;Pressure is low, flow is low, oil temperature control is not good. |
| Chip removal is not good, or not continuous | Cutting oil pressure and flow is too low.Workpiece chip removal is difficult, we should grind a chip breaker groove. Feeding rate is too big, spindle rotating is too small. |
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