Do you Know the 4 Sentence Formulas for Fried Dough Twist Drill?

The standard high-speed steel twist drill consists of three parts: the working part, the neck, and the handle. The working part is divided into the cutting part and the guiding part. Two front blade surfaces, two rear blade surfaces, two auxiliary rear blade surfaces, two main blades, two auxiliary blades, and one transverse blade. The handle is a clamping part, with a straight handle and a conical handle (flat tail). The neck is used for the retraction of the grinding wheel when grinding the handle.

4 pithy formulas for sharpening twist drill

1. Edge leveling wheel face

"Edge" refers to the main cutting edge, and "leveling" refers to the main cutting edge of the sharpened part being in a horizontal position. The position of the drill bit and the grinding wheel is the first position of the grinding edge. After being placed, the drill bit will slowly approach the grinding wheel.

2. Oblique setting out the angle of the drill shaft

This refers to the positional relationship between the axis line of the drill bit and the surface of the grinding wheel. Generally, the angle between the axis of the drill bit and the surface of the grinding wheel is 60 °, because it directly affects the top angle of the drill bit, the shape of the main cutting edge, and the inclined angle of the transverse edge.

3. Grinding the back from the edge

This means that the grinding wheel is first contacted from the edge of the drill bit, and then slowly ground down from the edge back to the cutting surface.

4. Swing up and down and don't tilt your tail

When grinding the drill bit, we hold the top of the drill bit and swing the hand up and down evenly on the grinding wheel surface. The handheld on the handle can not swing at will, but also prevent the rear handle from warping above the horizontal centerline of the grinding wheel.

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