IMPORTANCE OF DIAMETER AND SLOT HOLES IN SHEET METAL PIECE REFERENCING

Hello Friends

While reading this article, it will be useful to keep my 3-2-1 Rule in Referencing Strategy article (https://www.plusegitimdanismanlik.com/post/referanslama-datumlama-strateji%CC%87si%CC%87nde-3-2-1-kurali) open. Because while writing this article, I did not want to include the 3-2-1 Rule in Referencing Strategy examples here and unnecessarily expand the text.

In my 3-2-1 Rule in Referencing Strategy article, I showed the straightening from the surface. In fact, taking straightening from the surface is not a preferred method for sheet metal parts. Because surface undulations prevent you from getting a healthy straightening. For this reason, it is preferred to take straightening from diameter and slot holes in sheet metal parts.

It would be appropriate for the sheet metal part designer to know a diameter and a slot method and design accordingly.

In the example above, unlike my article on the 3-2-1 Rule in Referencing Strategy, this time I coded the reference codes as A-B-C instead of X-Y-Z.

A's are planes, but where is the alignment that should be B1-B2?

When there is a hole on the part, B is shown alone and aligns with C.

So what happened to the 3-2-1 rule? You are now seeing 3-1-1.

In fact, in this case, you need to think of it as a coordinate plane.

A's are looking at the X coordinate plane at Z, B-->XY and C, and in this case, we maintain the 3-2-1 rule as 3Z, 2X and 1Y.

If you are a manufacturer or supplier and there is no diameter and a slot hole in the sheet metal part drawing and the part you will produce is not a safety part or an insulation part, ask your designer or customer to show a diameter and a slot hole on the design. This will save you from the risk of surface variability while aligning, will allow you to keep your part more stable on the fixtures and thus produce higher quality parts.