What is the meaning of production drawing?

What is the meaning of production drawing?

Production drawings illustrate how to manufacture a product, providing information about dimensions, materials, finishes, tools required, methods of assembly and so on. Production drawings may be prepared by suppliers in response to engineering drawings provided by clients setting out their requirements.

What types of drawings are produced at the production stage?

Three main sets of production drawings include the following:

• Detail of each non-standard part on a drawing sheet, usually one part per sheet.
• Assembly drawing showing all parts on one sheet.
• A Bill of materials (BOM), essentially of each part.

What is the purpose of a manufacturing drawing?

Manufacturing drawings are pretty self explanatory. They show all the detailed specifications of the product so it can be manufactured. Of course, depending on the manufacturer, production quantities, and other factors, the method of actually manufacturing the product is determined by the manufacturer.

How do you read a production drawing?

INFORMATION BLOCKS

1. Name: company or agency who prepared or owns the drawing.
2. Address: location of the company or agency.
3. Name and date: responsible engineers who drew, checked, and approved the drawing.
4. Part name/description: describes what the part is.
5. Part/drawing number: assigned number to identify the part.

What is basic dimension in drawing?

In a technical drawing, a basic dimension is a theoretically exact dimension, given from a datum to a feature of interest. Because that’s true, basic dimensions identify tolerance information located in feature control frames that state geometric tolerances.

What is the meaning of runout in drawing?

Runout is how much one given reference feature or features vary with respect to another datum when the part is rotated 360° around the datum axis. It is essentially a control of a circular feature, and how much variation it has with the rotational axis.

What does Tir mean on a drawing?

Contact Us. Total indicator runout, or TIR, is a term often used in manufacturing, especially when dealing with rotating parts. Other names include total indicator reading, or more recently, full indicator movement (FIM).

What is difference between concentricity and runout?

Total runout does control taper as it controls the variation in radius to the datum for the entire surface. Concentricity sets a limit on how non-symmetrical the shaft is relative to the datum axis. If the shaft is oval it can still be concentric.

What is concentricity in drawing?

Concentricity is a 3-Dimensional cylindrical tolerance zone that is defined by a datum axis where all the derived median points of a referenced circular feature must fall into. the median points of the reference surface cross sections form the theoretical axis that must be in this tolerance zone.

What concentricity means?

Definitions of concentricity. the quality of having the same center (as circles inside one another) Antonyms: eccentricity. a circularity that has a different center or deviates from a circular path. type of: circularity, disk shape.

How is total runout calculated?

Gauging / Measurement: Another method for measuring total runout is to take one gauge held perpendicular to the surface of the part, and slowly move it across the surface of the part axially as the part is rotated. If the gauge varies at any point by more than the total runout tolerance, the part would be out of spec.

What is the difference between run out and total runout?

Run-out is measured at one section of the surface during rotation. Total-Run-out is measured along the whole surface during rotation.

What is run out tolerance?

Run-out tolerance is a geometric tolerance that specifies the run-out fluctuation of a target’s feature when the target (part) is rotated on an axis (specified straight line). A datum is always necessary to indicate run-out tolerance; as such, it is a geometric tolerance for features related to datums.

How do you read a GD drawing?

Parts of the Feature Control Frame

1. Leader Arrow. This points to the feature that the geometric control is placed on.
2. Geometric Characteristic Symbol.
3. Diameter Control / Cylindrical Tolerance Zone (if required)
4. Tolerance.
5. Modifier for the Tolerance.
6. Primary Datum (if required)
7. Secondary Datum (if required)