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What are the causes and countermeasures for hole enlargement in drilling?
The enlargement of the hole is caused by the runout and vibration of the tool during machining.
In addition, the runout of the outer circumference during installation affects the hole diameter and hole position accuracy.
Even with a high-rigidity and high-precision drill such as t
Do you need drilling centering?
Centering is used to improve hole position accuracy and to reduce unstable behavior during hole entrance machining.
Unless the hole position accuracy is strictly required, or the machining of slopes or spherical surfaces, centering is not always necessary.
If this is not the case, the use of a high
Even though the hole position is centered, the hole position becomes unstable. What can be done to improve the accuracy of the hole position?
When the drill starts to hit the workpiece from the shoulder, it is not possible to get the hole position properly.
Defect examples
point angle 90° starting drill for chamfering,
This may be due to runout during drilling.
(1) Runout when installing the drill.
Solution: Keep the installation slip within 20 μm (0.020 mm).
(2) If the lip height of the drill at regrinding time (variation in the height of the left and right cutting edges) is large, the drill tip w
The unit of feed (mm/rev) of the drill indicates how many millimeters the drill advances in one revolution. The unit is read as "milliper revolution".
OSG's Drill Catalog Condition Table lists the feed rate (mm/rev) per rotation of drills of major sizes in a range for each material. When referring to the feed
What is the rotation speed when inserting a long drill into the guide hole?
Since the drill digs while releasing chips, it is necessary to constantly drain chips from the trench to the outside. If you dig to the point where all the trenches are filled, you will not be able to drain the chips, and the chips will get stuck in the grooves and the dri
If you have enough mechanical horsepower, you don't need Pilot hole . It is recommended to drill holes from a solid state.
When drilling after Pilot hole machining due to insufficient machine horsepower, etc., there is a risk that chips wil
Dwell machining is a machining method that temporarily stops the progress of machining while the drill spindle is rotated.
It may be used to improve the surface accuracy of the bottom of the hole or to improve chip discharge by processing with a drill with an oil hole.
(A) Machining (B) Stop (C) Improving the surface rou
