Difference between revisions of "Level"
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'''Levels''' are used to accurately determine horizontal, vertical and other angles. | '''Levels''' are used to accurately determine horizontal, vertical and other angles. | ||
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==Spirit Level== | ==Spirit Level== | ||
The most common and well known level of all. | The most common and well known level of all. | ||
| + | * pictured above | ||
| + | * Only one DIYer is known to be unfamiliar with this common tool, Mr Nseowo: [http://news.bbc.co.uk/1/hi/england/shropshire/3142762.stm BBC] [http://www.google.com/search?hl=en&lr=&rls=en&hs=JXB&q=nseowo+extension&btnG=Search Google] | ||
| − | + | Its possible for a knock to misalign the vials, so a spirit level should be tested if dropped. | |
| − | + | ||
| − | + | Spirit levels are available with several vials, enabling reading of various angles close to horizontal, eg 1 degree, 2 degrees etc | |
| − | + | See [https://groups.google.com/group/uk.d-i-y/browse_frm/thread/5068de76dd234f79?hl=en# Quality], points to look for | |
| − | |||
===Glass vs Plastic Vials=== | ===Glass vs Plastic Vials=== | ||
| + | [[image:Spirit levels 2506-5.jpg|300px|right]] | ||
| + | |||
Glass vials: | Glass vials: | ||
* rarely scratch | * rarely scratch | ||
| Line 28: | Line 31: | ||
* scratch easily | * scratch easily | ||
* go cloudy in time | * go cloudy in time | ||
| − | * work any way up, since the tube is tapered instead of curved one way. | + | * work any way up, since the tube is barrel tapered instead of curved one way. |
| + | |||
===Types=== | ===Types=== | ||
====Large==== | ====Large==== | ||
| + | . | ||
| + | |||
====Fencing==== | ====Fencing==== | ||
A fencing level has 3 vials at right angles to each other to enable [[fence]] posts to be installed upright. | A fencing level has 3 vials at right angles to each other to enable [[fence]] posts to be installed upright. | ||
| + | |||
====Miniature==== | ====Miniature==== | ||
| + | . | ||
| + | |||
====Line level==== | ====Line level==== | ||
| − | [[image:Line level 421-3.jpg|right| | + | [[image:Line level 421-3.jpg|right|50px]] |
| − | A line level has hooks to hang on a string line. It | + | A line level has hooks to hang on a string line. It needs to hang in the middle of the line to read right. |
| + | |||
| + | |||
| + | ====Bulls Eye Level==== | ||
| + | [[image:800px-Green_bull's_eye_level_(level).jpg|right|100px]] | ||
| + | |||
| + | * Indicating vial is round rather than tubular | ||
| + | * Indicates level in 2 axes | ||
==Card Level== | ==Card Level== | ||
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* Fragile if made from card, robust if made from plastic | * Fragile if made from card, robust if made from plastic | ||
* [[Card level|Make one]] | * [[Card level|Make one]] | ||
| + | |||
==Plumb Bob== | ==Plumb Bob== | ||
[[image:Plumb bob 2790-2.jpg|right|20px]] | [[image:Plumb bob 2790-2.jpg|right|20px]] | ||
| − | The Plumb bob is a | + | The Plumb bob is a weight on a string. The weight has a pointed base, and indicates the vertical. |
* Affected by wind | * Affected by wind | ||
| − | * | + | * Takes time to settle |
| − | * Easily improvised | + | * Easily improvised with a large washer |
| + | |||
==Laser Level== | ==Laser Level== | ||
A laser level can project a vertical or horizontal line of light onto the workpiece. This makes level visible without needing a hand to hold the level, and without marking the workpiece. | A laser level can project a vertical or horizontal line of light onto the workpiece. This makes level visible without needing a hand to hold the level, and without marking the workpiece. | ||
| − | However this | + | However this doesn't necessarily make things easier or quicker due to setup time. IME a long spirit level is often quicker to use. |
| − | == | + | ==Plumb bob level== |
| − | Set square with mini plumb bob in it | + | Set square with mini plumb bob in it |
* Reads horizontal & vertical | * Reads horizontal & vertical | ||
* not often seen now | * not often seen now | ||
* affected by wind | * affected by wind | ||
| + | * Used in building the Egyptian pyramids | ||
| + | |||
==Water Level== | ==Water Level== | ||
| − | + | A flexible pipe containing [[water]]. Wherever the ends of the tube are placed, water at both ends will settle at the same height. | |
Useful for finding level over a long distance. | Useful for finding level over a long distance. | ||
| − | May be made by using either clear tubing or a hosepipe with a short distance of clear tube or a funnel at each end. | + | May be made by using either clear tubing, or a hosepipe with a short distance of clear tube or a funnel at each end. |
==Line Level== | ==Line Level== | ||
| − | A line level is a miniature spirit level that is hooked onto a horizontal line. The level | + | A line level is a miniature spirit level that is hooked onto a horizontal line. The level is attached at the centre of the line otherwise large errors are introduced. Uneven line surface can also affect accuracy. Not as accurate as rigid spirit levels. |
* Spans long distances | * Spans long distances | ||
| − | * | + | * Indication is distant from where the line ends are being held |
| − | |||
| Line 96: | Line 115: | ||
=Testing a Level= | =Testing a Level= | ||
==Spirit Level== | ==Spirit Level== | ||
| − | Spirit levels don't always read correctly. | + | Spirit levels don't always read correctly. To test: |
# Place level on a surface that is level or close to level. For precision, adjust or pack the surface so it reads level. | # Place level on a surface that is level or close to level. For precision, adjust or pack the surface so it reads level. | ||
| − | # Turn the level round. It should read the same each way round. If it does, it reads correctly. | + | # Turn the level round. It should read the same each way round. If it does, it reads correctly. |
If it doesn't indicate the same each way, the vial position can usually be adjusted. | If it doesn't indicate the same each way, the vial position can usually be adjusted. | ||
| Line 112: | Line 131: | ||
==Plumb Bob== | ==Plumb Bob== | ||
| − | A plumb bob will always read level providing the weight is symmetrical and hanging symmetrically. Even if not, the string will always read correctly, though the weight may not. | + | A plumb bob will always read level providing the weight is symmetrical and hanging symmetrically. Even if not, the string will always read correctly, though the weight may not. Improvised plumb bobs can need testing, correctly designed ones don't. |
There are 2 ways to test plumb bobs. | There are 2 ways to test plumb bobs. | ||
# Determine vertical level by another accurate means, and compare the plumb bob's reading | # Determine vertical level by another accurate means, and compare the plumb bob's reading | ||
| − | # Set the plumb bob weight to slowly rotate without it swinging. This is done by twisting the string so that horizontal swing settles before rotation settles. Once swing has settled, the indication should not move at all with rotation. | + | # Set the plumb bob weight to slowly rotate without it swinging sideways. This is done by twisting the string so that horizontal swing settles before rotation settles. Once swing has settled, the indication should not move at all with weight rotation. |
=See also= | =See also= | ||
| − | * [[Card | + | * [[Card level]] |
| + | * [http://en.wikipedia.org/wiki/Spirit_level Wikipedia] | ||
* [[Special:Allpages|Wiki Contents]] | * [[Special:Allpages|Wiki Contents]] | ||
* [[Special:Categories|Wiki Subject Categories]] | * [[Special:Categories|Wiki Subject Categories]] | ||
Latest revision as of 11:06, 2 April 2015
Levels are used to accurately determine horizontal, vertical and other angles.
Level Types
Spirit Level
The most common and well known level of all.
- pictured above
- Only one DIYer is known to be unfamiliar with this common tool, Mr Nseowo: BBC Google
Its possible for a knock to misalign the vials, so a spirit level should be tested if dropped.
Spirit levels are available with several vials, enabling reading of various angles close to horizontal, eg 1 degree, 2 degrees etc
See Quality, points to look for
Glass vs Plastic Vials
Glass vials:
- rarely scratch
- never cloud
- are breakable
- only work the right way up, as the tube is parallel sided, and is curved slightly
Plastic vials:
- are much more robust against knocks
- scratch easily
- go cloudy in time
- work any way up, since the tube is barrel tapered instead of curved one way.
Types
Large
.
Fencing
A fencing level has 3 vials at right angles to each other to enable fence posts to be installed upright.
Miniature
.
Line level
A line level has hooks to hang on a string line. It needs to hang in the middle of the line to read right.
Bulls Eye Level
.jpg)
- Indicating vial is round rather than tubular
- Indicates level in 2 axes
Card Level
An uncommon but versatile level capable of finding all angles.
- Determines all angles
- Easily improvised
- Small, lightweight & compact
- Affected by wind
- Fragile if made from card, robust if made from plastic
- Make one
Plumb Bob
The Plumb bob is a weight on a string. The weight has a pointed base, and indicates the vertical.
- Affected by wind
- Takes time to settle
- Easily improvised with a large washer
Laser Level
A laser level can project a vertical or horizontal line of light onto the workpiece. This makes level visible without needing a hand to hold the level, and without marking the workpiece.
However this doesn't necessarily make things easier or quicker due to setup time. IME a long spirit level is often quicker to use.
Plumb bob level
Set square with mini plumb bob in it
- Reads horizontal & vertical
- not often seen now
- affected by wind
- Used in building the Egyptian pyramids
Water Level
A flexible pipe containing water. Wherever the ends of the tube are placed, water at both ends will settle at the same height.
Useful for finding level over a long distance.
May be made by using either clear tubing, or a hosepipe with a short distance of clear tube or a funnel at each end.
Line Level
A line level is a miniature spirit level that is hooked onto a horizontal line. The level is attached at the centre of the line otherwise large errors are introduced. Uneven line surface can also affect accuracy. Not as accurate as rigid spirit levels.
- Spans long distances
- Indication is distant from where the line ends are being held
Post Level
This is a 3 vial L-shaped spirit level that determines all 3 axes of level for vertical posts. Used for fencing.
Dumpy Level
A levelled telescope used with a staff (pole) for transferring a level around a site. Used with 2 people. Simple and very accurate.
Testing a Level
Spirit Level
Spirit levels don't always read correctly. To test:
- Place level on a surface that is level or close to level. For precision, adjust or pack the surface so it reads level.
- Turn the level round. It should read the same each way round. If it does, it reads correctly.
If it doesn't indicate the same each way, the vial position can usually be adjusted.
As a temporary measure,
- the correct indication is halfway between the 2 spirit level indications.
- the reading can be corrected by adding duct tape or card to the underside at one end
Card Level
The same approach is used as with a spirit level, take a reading, turn the card round and read again. Both readings should be identical. If not, the card can have a corner snipped to level it.
Plumb Bob
A plumb bob will always read level providing the weight is symmetrical and hanging symmetrically. Even if not, the string will always read correctly, though the weight may not. Improvised plumb bobs can need testing, correctly designed ones don't.
There are 2 ways to test plumb bobs.
- Determine vertical level by another accurate means, and compare the plumb bob's reading
- Set the plumb bob weight to slowly rotate without it swinging sideways. This is done by twisting the string so that horizontal swing settles before rotation settles. Once swing has settled, the indication should not move at all with weight rotation.