type of drills
TRANSCRIPT
TYPES OF DRILLS
Mansoura UniversityFaculty of Engineering
Dept. of Production Engineering and Mechanical
Design
Machining Techniques and Equipment (1) - Types of Drills 2
PRESENTED BY:Hassan NabilMohammed MegahedSameh MohammedMostafa SadekHossam Sobh
SUPERVISED BY:Dr. Rania Mostafa
Machining Techniques and Equipment (1) - Types of Drills 3
OUTLINE:• What is a drill?• Why need different types of
drills?• What changes from one type of
drills to another?• Introducing different types of
drills.• Conclusion
Machining Techniques and Equipment (1) - Types of Drills 4
INTRODUCTIONWhat is a drill?• A drill is, mostly, a double-edged
cutting tool, used for producing circular holes in the work-piece.
• There is a variety of purposes for which circular holes are needed, such as fitting joints or shafts or even passing gases, fluids, etc.
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WHY NEED DIFFERENT TYPES OF DRILLS?
• Obviously, the various purposes of circular holes leaded to a wider variety in the types of drills.
• Each drill is specialized in making a hole with specific characteristics which cannot be obtained using another drill.
• For examples, drilling in soft materials requires a specific type of drills. One cannot simply completes this mission using a drill that is specialized in widening holes!
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WHAT CHANGES FROM ONE TYPE OF DRILLS TO
ANOTHER?• There are significant characteristics that differ one type of drills from any other type.• The specifications that change may be the tool
material, flute length, diameter, helix angle, point angle, type of shank, etc.• The job required decides on the specifications
needed, that is, a specific type of drills.
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• For example, fast spiral drills are preferred to generate deep holes. Also, reducing the land width increases chip space.
WHAT CHANGES FROM ONE TYPE OF DRILLS TO
ANOTHER?
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DIFFERENT TYPES OF DRILLS
Spade Drill
Gun Drill
Step Drill
Core drill
Twist Drills
General-purpose
drillLow-helix
drillHigh-
helix drillCoolant
hole drill
Straight flute drill
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DIFFERENT TYPES OF DRILLS
Step Drill
Spade Drill Core Drill Straight-
Flute DrillGun Drill
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DIFFERENT TYPES OF DRILLS
TWIST DRILLS:• Twist drills are the most common drills in
use.• In the following slides comes a very brief
introduction to some of twist drills.
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TWIST DRILLS:
DIFFERENT TYPES OF DRILLS
1. General-Purpose Drill:• Has two Helical flutes.• Designed to perform well on wide variety of materials, equipment and job conditions.• Comes in varying point angle, speeds and feeds to be suitable for many conditions.
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TWIST DRILLS:
DIFFERENT TYPES OF DRILLS
2. Low-Helix Drill:• Developed primarily to drill brass and thin materials.• Used to drill shallow holes in some aluminium and magnesium alloys.• Can remove large volume of chips formed by high rates of penetration.
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TWIST DRILLS:
DIFFERENT TYPES OF DRILLS
3. High-Helix Drills:• Designed for drilling deep holes in
aluminium, copper, die-cast material, and other metals.
• High helix angle (35º to 45º).• Wider flutes assist in clearing chips
from hole.
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TWIST DRILLS:
DIFFERENT TYPES OF DRILLS
4. Oil Hole Drills• Have one or two oil holes running from
shank to cutting point in order to force compressed air, oil, or cutting fluid while deep holes are being drilled.
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CONCLUSION…
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THANK YOU!