Общий каталог ZCC-CT 2019 - страница 1107

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A Trouble shooting – solid carbide drills

ErrorReasonCountermeasure
Oversized holes– Insufficient clamping of workpiece and/or tool – Large radial run out – Point relief is off centre– Use precision clamping – Reduce spindle play – Check and adjust clamped drill
– Asymmetric point angle – Large radial run out – Point relief is off centre– Regrind drill – Check quality of regrinding
Irregular hole size– Asymmetric point angle – Large radial run out – Point relief is off centre – High wear– Use precision clamping – Reduce spindle play – Check and adjust clamped drill
A B– Insufficient clamping of work piece and/or tool – Large radial run out – Point relief is off centre – High wear– Use precision clamping – Reduce spindle play – Check and adjust clamped drill
A B– Feed rate too high– Reduce feed rate
– Insufficient coolant– Increase amount of coolant or change coolant supply
Low position accuracy– Insufficient clamping and spindle positio- ning – Large radial run out of spindle– Improve positioning of machine – Use precision clamping – Calibrate spindle – Check and adjust clamped drill
– The feed direction is not vertical to the workpiece surface– Adjust feed rate vertically to workpiece surface
– Tool isn't aligned with centre of spindle (lathe machines– Centre the tool
Bad drill run out– High tool wear– Regrind drill
– Poor drill accuracy– Improve positioning of drill
– Asymmetric point angle – Large radial run out – Point relief is off centre– Regrind drill – Check quality of regrinding
– Insufficient tool stability– Improve stability of tool
– Uneven workpiece surface – Tool isn't aligned with centre of spindle (lathe machines)– Before boring align the workpiece horizontally to the drill or pre-machine the workpiece
Inaccurate hole (roundness)– Asymmetric point angle – Large radial run out – Point relief is off centre – High wear– Regrind drill – Check quality of regrinding
– Insufficient clamping of work piece and/or tool – Large radial run out of spindle– Use precision clamping – Calibrate spindle – Check and adjust clamped drill
– Clearance angle too large – Insufficient tool stability– Regrind the drill – Improve tool stability

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