Measuring Tools Part A Flashcards
Basic (non-precision) measurement to within 1/64 inch (0.5mm). All measurement requires three elements, which are:
- The part
- The measurement device
- A standard
Six-Inch Steel Rules: what are the 3 types of reading of Ruler?
- Fractional inch rules cannot be measure any close than 1/64 inch
- Decimal inch rules measure to 1/100 inch (0.10 inch)
- Metric rules measure to 0.5mm
Types of Ruler (4 of them)
- Spring tempered rule
- Flexible rule
- Narrow rule
- Hook rule
Typical tolerance for Machinist
+/- 0.005
Types of Graduations (rule)
- Imperial inch fractional (1/8,1/16,1/32,1/64 inch)
- Imperial inch decimal ( 0.100, 0.050, 0.020, 0.010 inch)
- Metric ( 1mm & 0.50mm)
Types of Measuring tape
- Short line ( 30ft or 8m)
2. Long line ( 50ft or 30m)
Measuring tapes marking
- Foot-inch and continuous inch
- Metric
- Continuous inch and metric
Types of Precision Calipers
- Vernier Calipers
- Dial Calipers
- Electronic Calipers
Plate Protractors and Bevel protractors measure angle to within ___________?
One Degree (1*)
State the Equivalent of :
Full circle
1 degree
1 minute
360 degrees (360*) 60 minutes (60') 60 seconds (60")
Plate Protractor is know as ________ and used for ?
STEEL PROTRACTOR , Used for: •Layout •Checking the angle on cutting tools •Verifying the point angle of a drill bit
3 types of Protractor
Plate Protractor
Bevel Protractor
Universal Bevel Protractor
Universal Bevel Protractor,
Each graduation on the MAIN SCALE represent ______.
Each graduation on the VERNIER SCALE represent ______.
1 Degree (1*) 5 Minutes ( 1/2*)
3 types of Precision Calipers
Vernier Caliper
Dial Caliper
Electronic Digital Caliper
Parts of Vernier Caliper. (Name 7 of them)
Fixed Jaw Moveable Jaw Vernier Scale Metric Scale Inch Main Scale Beam Depth Blade
A Ruler that is about 3/16 inch thick and is NOT designed to be bent or flexed.
Spring-Tempered Rule
What Ruler that can be flexed around curves?
Flexible Rule
What type of Ruler that can be used in narrow enough to be used in tight spaces?
Narrow Rule
Type of Ruler that has a hook at the end.
Hook Rule
Are all Precision Calipers (Vernier, Dial and Electronic Digital caliper) same accuracy ?
Yes ( on the textbook )
Is Micrometer is more accurate than Precision Caliper?
Yes
Cheacking and Zeoring the Caliper.
Clean the Jaw and Close the Jaws and hold the caliper up to a light source make sure you don’t see any gap.
________ Caliper use a rack and pinion gear to move a pointer around the face of a dial.
Dial Caliper
Reason why we should not used the Electronic Digiral Caliper for measuring the 0.0001 inch or 0.02mm?
- Mechanical looseness, also called play on the jaw
- Deflection or Bending of the Beam
- The Jaws on the caliper can wear
3 Types of Height Gauges
- Dial Height Gauge
- Electronic Height Gauge
- Vernier Height Gauge
Parts of Vernier Height Gauges. (5 of them)
- Beam
- Clamp Screw
- Sliding Vernier Scale
- Scriber
- Base
What Height Gauges are used for ?
Height Gauge (Vernier) is a common precision layout tool and can be set to an accuracy of 0.001 inch or 0.02mm.
Parts of Micrometer ( 7 of them )
- Anvil
- Spindle
- Sleeve
- Frame
- Lock Nut
- Thimble
- Ratchet
Micrometer Sizes
Imperial Micrometer have a range increment of 1 inch, which means that they measure from 0 to 1 inch, 1 to 2 inch and so on …..
Types of Micrometer
- Interchangeable Anvils
- Combination Inch-Metric Micrometer
- Electronic Digital Micrometer
- Inside Micrometer
- Intrimik
- Depth Gauge Micrometer
What you should do before using Micrometer?
- Clean the measuring faces
* Check the micrometer for zero setting
______ Micrometer offers greater precission than the standard micrometer because it subdivides the 0.001 inch or 0.01mm graduations.
Vernier Micrometer