Общий каталог Tungaloy 2020 - 2021 - страница 1670

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Troubleshooting i n gun drilling

ProblemCauseTriggerCountermeasure
Clamping the workpiece is unstable.Clamp the workpiece firmly.
The type of coolant is not appropriate.Use water-insoluble coolant.
Foreign material is in the coolant.Thoroughly filtrate the coolant (Use a filter with the filtration accuracyin 10µm or less).
i shMachineThe run-out of the spindle is too large.Minimize the run-out of the spindle.
e fi niThe clearance between the guide bush and the drill is not appropriate.Replace the guide bush (The clearance should be between +0.003 and +0.008).
rfac iThe feed speed (Vf) varies.Use mechanical feed.
gh su iThe number of revolutions varies (decreases).Increase the machine power or adjust the cuttingconditions.
Rou iAbnormal damage occurs.See “Short tool life” for the details.
DrillRegrinding is in poor quality.Make sure no damage is left on the drill and that the cutting edge geometry is not changed.
Cutting conditionThe feed (f) is too high.Reduce the feed.
OthersChip packing occurs.See “Chip packing” for the details.
The clearance between the guide bush and the drill is not appropriate.Replace the guide bush (The clearance should be between +0.003 and +0.008).
dricity,MachineThe guide bush is apart from the workpiece surface at the entry.Contact the guide bush closely with the workpiece.
ynThe type of coolant is not appropriate.Use water-insoluble coolant.
arity, c size curacyThe concentricity of the guide bush and the spindle is too large.Decrease the concentricity of the guide bush and the spindle.
rcul ver acAbnormal damage occurs.See “Short tool life” for the details.
table ci and o HoleDrillRegrinding is in poor quality.Make sure no damage is left on the drill and that the cutting edge geometry is not changed.
ccepCutting conditionThe feed (f) is not suitable.Use an appropriate feed.
UnaWorkpieceInterrupted or cross drilling is required.Change the tool to a standard gundrill.
OthersChip packing occurs.See “Chip packing” for the details.
Clamping the workpiece is unstable.Clamp the workpiece firmly.
The guide bush is apart from the workpiece surface at the entry.Contact the guide bush closely with the workpiece.
MachineThe concentricity of the guide bush and the spindle is too large.Decrease the concentricity of the guide bush and the spindle.
leThe clearance between the guide bush and the drill is not appropriate.Replace the guide bush (The clearance should be between +0.003 and +0.008).
of hoThe selection of the guide pads is not suitable.Use 2 guide pads instead of 3.
endingDrillRegrinding is in poor quality.Make sure no damage is left on the drill and that the cutting edge geometry is not changed.
BCutting conditionThe feed (f) is too high.Reduce the feed.
The workpiece has blow holes or unevenness.Use the workpiece without defect.
WorkpieceThe workpiece surface is slanted at the entry.Use low feed.
Interrupted or cross drilling is required.Change the tool to a standard gundrill.