The Twist drill bit can be metal, concrete, wood, ceramic tile, glass, etc. drilling. For drilling holes in metals such as alloy steel, cast iron, etc. a black Twist drill bit made of high speed steel is needed. Speed should not be too high.
What are the characteristics of the Twist drill bit?
What are the precautions for using the Twist drill bit?
What is the difference between a straight and a conical Twist drill bit?
What are the characteristics of the Twist drill bit?
The spiral angle of the Twist drill bit mainly affects the size of the chip angle at the cutting edge, the thickness of the blade and the chip removal performance. Typically, the helical groove can be machined by milling, grinding, hot rolling or hot extrusion. The front end of the drill bit is sharpened after sharpening. A cut section is formed.
The tip angle of the cutting part of the ordinary standard Twist drill bit, the chamfer angle of the chisel edge is the clearance angle. Due to the design, the chip angle gradually decreases from the outer edge to the middle and the cross cutting edge is negative. The chip angle can be left and right. Extrude during drilling. To improve the cutting performance of the Twist drill bit, the cutting part can be ground into different shapes according to the characteristics of the material to be processed.
What are the precautions for using the Twist drill bit?
1. The Twist drill bit should be packed in a special box to avoid vibrations colliding with each other.
2. When using, remove the Twist drill bit from the package and install it in the spring chuck of the spindle or in the tool magazine for automatic drill change. Put it back in the box after use.
3. To measure the diameter of the drill bit, a non-contact measuring instrument such as a tool microscope should be used to prevent the cutting edge from being squeezed by contact with the mechanical measuring instrument.
4. Some CNC drills use positioning rings, and some CNC drills do not use positioning rings. If the positioning ring is used, the depth positioning of the drill must be accurate during installation. If the positioning ring is not used, the extension length of the drill installed on the spindle must be consistent, and the multi-spindle drill should pay more attention to this point, so that the drilling depth of each spindle should be consistent. If it is inconsistent, it can cause the drill bit to drill to the table or not be able to drill through the PCB and cause scrap.
5. The Twist drill bit can use 40x stereo microscope to check the wear of the cutting edge of the drill bit.
What is the difference between a straight and a conical Twist drill bit?
Twist drill bit cylinder shaft and tapered shaft have different functions. Generally, the Twist drill bit with conical shank is used for diameter over 13 mm, and the straight shank is used for the following. The main consideration is the comfort of tensioning and sufficient tensioning force. It is obviously not economical to make a small drill into a cone, so a straight shaft is made.
The Twist drill bit pipe is a tool accessory for consumables in mining. It is a Twist drill bit pipe used in worm drills for drilling carbon seams.
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