ZHENYUAN TOOLS - All Kinds Of Twist Drill Bits

 

        The twist drill is the most common type of drill. The shank of the drill is held by the  machine tool, which in turn imparts a rotary motion. This shank may be straight or tapered. The body of the drill is typically made up of two spiral grooves known as flutes, which are defined by a helix angle that is generally about 30 degree  but can vary depending on the material properties of the workplace. The point of the drill generally form a 118＜ angle and includes a 10 degree clearance angle and chisel edge .The chisel edge is flat with web thickness of approximately 0.015 x drill diameter. This edge can cause problems in hole location owing to its ability to "walk" on a surface before engaging the workplace. In the case of brittle materials, drill point angles of less than 118 are used, while ductile materials use larger points angles and smaller clearance angles.

　

   Tongyu Company can provide different kinds of twist drills including straight shank, taper shank, hex shank, reduced shank and special twist drills. Following are the links below for information on tongyu HSS drill bits lines. If you require further product information, please contact your freely, many thanks!

German Standard

American Standard

All Drill Bit Sets

　

 DIN338, HSS Twist Drills

Jobber Length Drills

 HSS twist drill sets

　 　 　

DIN1897, Short Type Drills

Screw Machine Drills

     Combination Drill Sets

　 　

DIN340, Long Type Drills

Taper Length Drills

  Power Tool Sets
　 　 　

　　　　　　　　　　　　　　　　　　　

DIN1869, Long Type Drills

6" 12" & 18" Long Type Drills

　

Double Ended Drills

 Double Ended Drills

　

Hex Shank Drills

Hex Shank Drills
　 　

Reduced Shank Drills

Reduced Shank Drills

　

DIN345 Taper Shank Drills

Three Flats Shank Drills
　 　

DIN341, Taper Shank Drills

ANSI Standard Taper Shank Drills
　 　
　

　

Aircraft Extension Drills

HOW TO USE THE DRILL BITS:

You can drill holes, of course, with a power drill. But you can also strip paint, install screws, and sand and polish objects with this versatile tool. Here are the basics of using a drill.

　

Instructions

Difficulty: Moderately Easy

Steps

　

1. Step One

Make sure the cord is long enough to reach from the electrical outlet to the place where you plan to use the drill.

　

2. Step Two

Use the chuck key that comes with the drill to open the chuck. Do this by pushing the nubbed end of the key into a hole along the chuck and twisting counterclockwise. The teeth on the chuck key should engage the ones on the drill.

　

3. Step Three

Insert the bit into the chuck and tighten it with the chuck key, turning it clockwise this time. Be sure it's very snug.

　

4. Step Four

Plug the drill in.

　

5. Step Five

Press the trigger before you make contact with the work.

　

6. Step Six

Slowly touch the tip of the bit to the work and apply steady but light pressure.

　

7. Step Seven

Maintain the pressure on the drill and the trigger until the hole is completed.

　

8. Step Eight

Keep the trigger depressed as you slowly back the bit out of the hole.

　

9. Step Nine

Use different attachments - a disk sander, a buffer pad, a hole saw, a bit extender and so forth - to make other jobs easier.

　

10. Step Ten

Make a dent with a center punch before drilling metals. This will keep the bit from wandering. It's also a good idea to always drill a pilot hole in metals and hardwoods to prevent binding of the bit.

　

Tips & Warnings

  • If you want to drill a hole of a certain depth, mark the measurement on the drill bit with a piece of colored electrical tape and stop drilling when you reach the tape.

  • To prevent overheating, use cutting oil when drilling metals.

  • Always wear safety goggles when operating a power drill.

  • Keep long hair and loose sleeves well away from the bit.