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What is a back taper?
The outer diameter of the drill is tapered from the tip to the shank, and it is attached to avoid friction with the inner surface of the hole during cutting.
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When the drill is tipped with regrinding , the drill diameter is gradually reduced due to the back taper.
[ Approximate amount of back taper ]
Diameter decreasing between 100 mm (mm)
(Highs)0.04~0.14mm
(Carbide)0.20~0.30mm