In a nut shell, datum target areas are not illegal but sometimes impractical. The people is Quality disregarded it and used a normal 3 point set up. One Designer out of the Detroit area always placed one (1) datum target for a primary surface and when I was in their plant, I asked about it. Example: Target Symbol and X Target Area selected Click in the graphics area to place the target and then the symbol. Set the properties in the PropertyManager.
There is nothing in the standard that states that that one MUST apply 3 points to set up primary surface but it is practical. Click Datum Target (Annotation toolbar), or click Insert > Annotations > Datum Target. Im leaning towards using a space point though I feel a plane point is the proper way. In the attachment, I show the affects of using Touch, Space and Plane points in the Base Alignment. If your customer gave a large surface as a datum target for a primary datum, it is not practical but not illegal either. Per the sketch below, Im looking for confirmation as to the proper type of point to use for datum target C. The primary datum is usually the mounting surface on a non-cylindrical part while the secondary and tertiary datums are usually holes that are used for assembly rather than surfaces that may not have any meaning.ĭatum targets are not usually reflected on the drawing by the Designer but rather by Manufacturing Engineering & Quality on how the part is processed and/or inspected.ĭatum targets can be points but they can also be round flats and it depends upon the processing of the part. For the datum target area symbols, the information about the area shape and size can be putted in the upper. To insert a datum target proceed as follows: 1, In the Upper Text box, enter the text to appear in the top portion of the datum target select the Diameter. Target elevation of the lake pool is 882 ft. The lower contains datum letter and target number. Latitude: 43.865800 N, Longitude: 89.954700 W, Horizontal Datum: Unknown. What is a lofted part? What is a SCD drawing?ĭrawings should specify datums on features that reflect the fit and function of the part. The datum target symbol is a circle which is divided into two parts. Specifies that the datum point position and data area symbol size match the scale. Framed dimensions shall define the location of the. This is a tough one especially with some of the terms that you used. Accesses the Datum Target Properties dialog box. When the datum target is a point, then the circular frame is linked to a cross-placed on the surface.
0 kommentar(er)
