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24 Cards in this Set
- Front
- Back
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What is a drill used for |
To cut holes in different types of materials |
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What is the helix of a drill |
The angle between the centerline and thr land, the twist in a drill |
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Name the parts of a drill |
Tang Shank Body Land Flute Point angle |
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What are the main types of drill bits |
Standard twist drill Taper shank Center drill Morse taper shank |
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What are the names of the various angles on a drill |
Chilse edge angle Helix angle Point angle Lip clearance angle |
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What are the correct angles for point and lip clearance Mild steel Brass Stainless steel Aluminum |
118 12-15 118 12-15 130 135 6 9 100 12 15 |
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How to sharpen a drill |
Make sure the face of the grindstone is flat Remove as little material as possible Check lip clearance lengths are the same Make sure the angle is correct |
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How are angles and lengths of drill lips checked |
Drill gauge |
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What happens to a hole when use use a drill with Unequal lip lengths Incorrect cutting and clearance angles |
Becomes over shaped and oversized Excessive friction, more wear than normal, unequal swarf |
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What happens when you plunge a hit drill into cold water |
It could cause cracking of the cutting edge |
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Two methods to sharpen a drill |
Grinding stone by hand In a special machine |
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How are drills held in the machine |
They are held into machines by using Jacobs chuck or keyless chuck, can be put straight into the machine If it has a taperd shank |
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How do you correctly install and remove a taper shank drills from sleaves |
Drill drift |
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Name the different types of drill chucks and how are they driven |
Jacob's chuck Keyless chuck By gears |
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Give to reasons for using cutting fluid |
Removing heat Lubrication |
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What materials are cutting fluids not used on |
Wood, plastic, brass |
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What coolant should be used for what job Drilling aluminum Reaming aluminum Drilling mild steal Reaming mild steal |
Soluble oil, kerisene Soluble oil, kerosene Soluble oil, mineral oil Soluble oil |
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What is counter boring |
Enlarging the end if a hole to fit cylinder shaped head of screws, needs a pilot hold to drill |
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What is spot facing |
Facing the surface around a hole to provide a flat surface for a seat of screw |
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Countersinking |
Makes a cone shaped enlargement at the entrance if a drilled hold providing a seat for screws |
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What are reamers |
Special drill bits that produce a high accuracy finish to holes |
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If you drilled the interacting hole first what problems might you encounter |
The drill will take the path of least resistance so it will go off on a angle and damage or break the drill bit |
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3 evidence for excessive cutting speeds |
Wearing cutting lips Blue cutting lips Chipping swarf |
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3 evidence for excessive feee |
Worn chisle point Over heating of drill Chipped cutting lips |
