2023年3月28日 · The datum simulators for this pattern of holes will be located at the true positions of the holes, defined by basic dimensions on the drawing. The resulting datums will be used to create the datum reference frame from which the part will be inspected.

2011年12月28日 · The four holes are each positioned to A, B, C, and then they collectively form datum D, which the center hole is positioned to. Notice that the basic dimensions of 20 and 45.6 could have been tagged to any of the four holes, since they all help form the datum.

2024年3月16日 · Placing the Datum on an axis is common with GD&T symbols that can have axis control like runout, perpendicularity, or concentricity. On a Point or Hole's Axis. To establish a datum axis on a feature such as a hole, there are a number of ways to place the datum symbol: The "A" Datum can appear in these three different places on a drawing...

The simulated Datum Frame (Plane – Orients, Top Hole – Locates, Bottom Hole – Orients) implies the Top Hole has priority over the bottom Hole. Top Hole and Bottom Hole Centers were established from the Unrelated Actual Material Envelope, Rather than the Related Maximum Material Boundary (ASME Y14.5-2009, Fig. 4-26, ISO 2692-2006 Figure A.12).

All four locating holes are designated as pattern datum [B]. The large center hole is then located to [A] primary, and [B] secondary. Everything is called out MMC and MMB because our only concern is assembly.

2023年5月16日 · If I specify a hole in a practically thin feature, such as a piece of sheet metal, is this still considered a cylindrical datum? Is this a poor choice of datum? In this article, we look at an example to help us answer these questions.

2010年7月22日 · Datums represent your mating parts. If you just hang your part on a stick using DIA 2 hole, then 2 datums are enough. If the datum feature A of the part is leaning against flat mating part, then you need all 3 datums: datum A will control perpendicularity of your hole to the flat. And TED7, you need to learn some basics about “ISO understanding”.

2023年7月7日 · I'm perplexed at how I can use the four hole pattern as datum C but control the position of the green holes tighter than the position of the group ( a pattern within a pattern). If I use a composition position like in the picture below it would hold the position of all holes to 0.4 instead of what I want - 0.4 between the green holes and 0.8 ...

2024年5月27日 · In this Question Line video, Jason responds to a question regarding radial hole patterns as datum features. He discusses how to set up the datum reference frame, how the datum reference frame controls degrees of freedom, …

2024年6月25日 · The two hole pattern as a datum feature allows for precise measurement and alignment, ensuring the overall quality of a part or product. By understanding GD&T principles and the role of datums, manufacturers can achieve the desired tolerances and dimensions necessary for successful production.