Lecture Metroloy Pec3 by sara SOLIMAN

Task 1

2025-01-23 07:36:41 UTC

Linear measurement : thickness of metal plate

Geometric shape measurement : roundness of a shaft

Screw threads and gear measurement : taper of a machine tool part

Surface texture measurement : roughness of a surface after machining

Angular measurement : roundness of gear teeth

Task 1

2025-01-23 07:37:21 UTC

Linear measurement: Thickness of a metal plate

Angular measurement: Roundness of a shaft

Surface texture measurement: Roughness of a surface after machining

Geometric shape measurement: Accuracy of a gear teeth

Screw threads and gear measurment: Taper of a machine tool part

2025-01-23 07:48:51 UTC

Linear measurement : vernier

Angular measurement : bevel protractor

Surface texture measurement : Roughness meters

Geometric shape measurement : dividers, protractor

Screw threads and gear measurement : micrometers

Tools

2025-01-23 07:52:39 UTC

Laser measure

Protractor

Profilometer

Callipers

Gear pitch gauge

2025-01-23 07:54:09 UTC

Accuracy is the amount of values and how much they are close to the right answers

Precision is the amount of close values to each other not caring about how much the are right

2025-01-23 07:54:31 UTC

Accuracy: is how close are the output results from the right one

Precision: how close are different outputs from each others

2025-01-23 08:09:01 UTC

Environmental errors: air and CO2

Dirt errors: emissions of the manufacturer

Errors due to improper instrument: using an measurement tool in a wrong way

Errors

2025-01-23 08:11:43 UTC

Dirt errors: errors due to dirt fusion into the manufacturing process

Elastic deformation errors: error accused by measuring a material that can deform elasticly so it can give several measurements depending on the amount of forces applyed on it

2025-01-23 08:12:57 UTC

alignment errors : 2 materials that cant be mixed together

Parallax error: error that occurs when the position of the eye is incorrect

2025-01-23 08:14:31 UTC

Elastic deformation errors: it’s a change in the results but when he breaks a defin point and also have a change in the curve or the structure

Alignment errors: it’s number of errors have the same prop and they the time between each one are the same interval

2025-01-23 08:45:46 UTC

All types of errors and some instruments measurement. The types of instruments measurement. What's the meaning of metrology. Accuracy and precision.

Thank you 😊

2025-01-23 08:46:17 UTC

Systematic error is the controllable error

Example : parallax error , this error happened when human eye is in incorrect position

Random error is the non controllable error

Example : scale error , when the scale is not accurate

Gross error is the human error

Conclusion

2025-01-23 08:48:18 UTC

•There's no escape from errors but it have to be as minimised as possible

•Errors depend on the user of the measuring instrument not only the instrument it self

•Accuracy and precision are different factors that are important to define how reliable are the measuring instrument

2025-01-23 08:58:13 UTC

1- Alignment error: it’s when the tool of scale for our object have a deformation

2- Dirt error: it’s when the area of work have touched with some dust

3- Gross error: it’s done by human and we can avoid it with add some help from the team to rewatch the calculations