25PCS Twist Drill Bit Set

• Type: Twist Drill Bit
• Use: Metal Drilling
• Transport Package: Mental Box
• Shipping Cost: Estimated freight per unit.: about shipping cost and estimated delivery time.
• Currency: US$
• Return&refunds: You can apply for a refund up to 30 days after receipt of the products.
• Model NO.: DBS-014
• Specification: 25PCS
• Trademark: FANXI
• Origin: P. R. China
• HS Code: 8207509000
• Production Capacity: 10, 000sets/Month
• Package Size: 12.00cm * 12.00cm * 12.00cm
• Package Gross Weight: 15.000kg

Product Description

Concept of twist drill bit

Twist drill is a kind of tool similar to twist shape, and twist drill is a tool for drilling by rotating. Because the spiral groove of twist drill has 2 grooves, 3 grooves and more grooves, there are many sizes of drill bits. But the most common one is 2 slots. Twist drill is generally divided into manual type and electric manual type, and it is also related to the large machinery used.

Composition and machining effect of twist drill bit

Twist drill bits are all manufactured according to the standard twist drill, which consists of a handle, a neck and a working part. There are six angles of twist drill bit, and different angles have certain differences in drilling accuracy and efficiency. Because the diameter of twist drill is limited by the hole diameter, because the spiral groove can make the drill core thinner, the rigidity of the drill bit is very low, and then the guide of the drill bit is not clear, and the axis of the hole is easy to deflect, which makes it difficult to center the horizontal blade and make the drill bit move. As a result, there is a big error in the shape and position of the hole. In addition, the front and rear curved surfaces of the twist drill bit are consistent, and the front angle and the back angle of each point of the cutting edge are different curves, which leads to poor cutting conditions and uneven speed, and finally leads to great wear of the drill bit, so the drilling accuracy is low. The last point is that the cutting speed is uneven due to the curve of the drill bit, and it is easy to form spiral debris accumulated on the workpiece, and then the debris forms extrusion and friction with the hole wall. Finally, the surface of the machined workpiece is very rough.


25PCS TWIST DRILL SET
H2501-1 black finished
H2501-2 edge ground
H2501-3 edge ground tin coated
H2501-4 fully ground bright
H2501-5 fully ground black finished
H2501-6 fully ground tin coated
Size(mm):1.0-13.0*0.5mm
Packing Inner :Mental Box Outer :Carton
N.W./G.W:23/24kgs
Meast:45*29*20cm(40Sets/Carton)