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14 Cards in this Set
- Front
- Back
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Why should you avoid looking into the beam of an industrial quality laser tool |
Lasers can injure your eyes |
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Why should you wear laser safety glasses |
Can protect your eyes from accidental exposure to laser beams |
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Name three groups of laser tools used in industry |
High accuracy, long distance lasers High accuracy, short distance lasers Construction grade lasers with limited accuracy |
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Into which classification do laser tools fall |
They are class II lasers with a maximum output of less than 1 mW |
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Why is space left between a sole plate and a foundation |
Grout is poured into the space after the sole plates have been aligned and levelled |
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Why should you use laser tools for levelling |
Laser tools have a high degree of accuracy and are relatively easy to use |
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Short distance laser beams are: |
Visible in daylight |
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Most construction grade lasers have an accuracy of: |
1/4 inch over a distance of 100 feet |
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Optical levelling equipment is composed of a _________with a spirit level attached |
telescope |
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Identify three optical instruments used for levelling equipment |
Alignment telescope Theodolite Tilting level Jig transit |
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A period of ____________the instrument is required to ensure accurate readings with a temperature change |
Acclimatizing |
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To maintain accuracy, the optical tool must be kept close to an equal distance from the ____________and the __________to reduce error |
Backsight and foresight |
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The tilting level has a rough alignment _____________(fish eye) that must be levelled first before adjusting the coincidence bubble. |
Circular vial (fish eye) |
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The ___________is used to identify thermal growth in horizontal planes |
Jig transit |
