The height that is used as the base level from which all other levels are established. Used in construction when when setting out a house. Also called a benchmark.
According to ASME Y14.5, a primary dimensioning datum requires at least 3 points of contact to establish the datum plane. Two points of contact are required for the secondary datum and 1 point of contact is required for the tertiary datum.
To select a suitable datum, consider a stable reference point on the workpiece or surface. Mark the datum clearly and securely. When marking out, ensure all measurements and reference points are taken from this datum to maintain accuracy and consistency. Working from a different datum can lead to incorrect measurements, misalignments, and errors in the final product. It is crucial to avoid this by consistently using the established datum.
1. Question is really vague, it is important to mark out the selected datum, as you just selected that datum? What else are you going to do with It? If you are working from another datum point just ensure that it is a good datum with critical measurements checked otherwise the new datum could throw out al measurements. P.s i wish the selected retards would stop answering with nonsense answers.
1) Track your progress, and 2) establish good job search practices.
Selecting and establishing a suitable Datum is critical, ensure your datum is at a fixed point. Normally a hole/slot. Holes and slots a normally lasor cut, ensuring they are at an extremely high tolorance already. Then reference the slot or hole to another near by slot or hole. Using these selected points will give you accruate points of measurement/datum.
Datum is not the plural of data. Datum is singular, and its plural form is data.
1. Question is really vague, it is important to mark out the selected datum, as you just selected that datum? What else are you going to do with It? If you are working from another datum point just ensure that it is a good datum with critical measurements checked otherwise the new datum could throw out al measurements. P.s i wish the selected retards would stop answering with nonsense answers.
Correction: What is hydrographic datum? not "hydrography"
take both index fingers, and slowly glide them into your rectum whilst singing "one more time.. were gona celebrate".
Datum surfaces are reference surfaces used in engineering and manufacturing to establish a common point for measurements and alignments. They provide a consistent and uniform starting point for design and quality control processes. Examples include planes, lines, and points from which other measurements are made.
datum is the plane in which we can sketch any thing thing
sorry but i don't think there is something as datum