19 Questions
What is the primary purpose of a combination square set?
To measure angles and lengths
What is the purpose of the square head in a combination square set?
To determine right angles and squareness
The blade of a combination square set has a curved surface.
False
The protractor head in a combination square set allows you to check or set angles to the closest ______________.
degree
Match the parts of a combination square set with their functions:
Blade (Rule) = Measuring reference Square Head = Determining right angles and squareness Protractor Head = Checking or setting angles Centre Head = Finding the centre of a piece of round stock
What is the purpose of the centre head in an engineer's square?
To locate and lay out the exact centre of round stock
The protractor head can be used to measure angles up to 360 degrees.
False
What is the purpose of the square head in an engineer's square?
Various uses, such as laying out parallel lines
The angular graduations on the protractor head usually read from 0 to _______ degrees both ways.
180
What is a common use of an engineer's square?
To mark off angles
Match the following parts of an engineer's square with their uses:
Centre head = Locate and lay out the exact centre of round stock Square head = Lay out parallel lines Protractor head = Mark off or measure angles up to 180 degrees
What is the purpose of try squares?
Draw the line at right-angles to an edge
Try squares can be used to measure angles.
False
What is the tolerance allowed for try squares under British Standard 3322?
0.01 mm per cm of steel blade
Try squares should be kept away from other bench tools to avoid __________ on the edges of the blade or the stock.
burr
What is the purpose of large sliding bevels?
To set or transfer an angle on a work piece
Sliding bevels are made of steel.
False
How should try squares be treated after use?
They should be lightly oiled
Match the following parts of the sliding bevel with their descriptions:
Stock = The part that remains fixed Blade = The part that remains fixed
Study Notes
Marking Tools: Engineers' Squares
- A combination square set is a measuring tool used by woodworkers and engineers to measure angles and lengths.
- The set consists of a blade (rule), square head, protractor head, and centre head.
Blade (Rule)
- A flat metal ruler with a groove running down the centre, serving as a measuring reference for various tasks.
Square Head
- Consists of two surfaces: the shoulder and the anvil.
- Can be adjusted along the ruler to slide down and lock at the desired measurement.
- Helps determine right angles and squareness.
Protractor Head
- Allows checking or setting angles to the closest degree.
- Can be locked in place to secure the reading.
Centre Head
- Helps find the centre of a piece of round stock.
Purpose of Try Squares
- Ensure paths are parallel to each other.
- Draw lines at right-angles to an edge.
Precision of Try Squares
- Permitted a tolerance of only 0.01 mm per cm of steel blade under British Standard 3322.
- No more than 0.3 mm on a 305 mm try square.
Caring for Squares
- Keep clean and avoid dropping.
- Lightly oil after use.
- Keep away from other bench tools to avoid burrs.
- Check for squareness at regular intervals.
Sliding Bevels
- Used to set or transfer an angle on a workpiece.
- Made of aluminum with a metric scale on the inside and a graduated scale on the outside.
The Sliding Bevel
- Composed of two parts: the stock and the blade.
- The blade can be adjusted to various angles and locked in position.
- Useful for marking lines at an angle on wood.
Quiz about marking tools, including the sliding bevel and combination square set, used for measuring angles and lengths in various trades like woodworking and engineering.
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