For weak twisting, the sharpness is reduced, but the cutting edge strength is high.
The stronger the torsion angle, the sharper the edge, but the lower the cutting edge strength.
The stiffness of the drill is higher with weak torsion.
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What is flute length ?
What is a shank with a tongue?
It is a shank with two flat sides at the end of the shank.
What is internal refueling? What is external coolant supply ?
Internal lubrication refers to tools such as Tap , drills, end mills, etc.
A cutting tap is a tap that processes internal thread by scraping the workpiece material.
straight fluted tap , spiral fluted tap and spiral pointed tap correspond to cutting taps.
forming tap is a tap that processes
Not only the base material of tools, but also various things have a relationship between "hardness" and "toughness".
The harder it is, the less likely it is to wear out, but it is easier to chipping .
The tougher it is, the more difficul