A38 · Reference edition 2026.11
Base plate coordinates — Comparison and alternatives
A coordinate grid is a location reference, not necessarily a dimensioning or tolerance system. Define its origin and orientation.
Scope and purpose
Compare alternatives using the same question and context. A difference in wording, layout or scale is not automatically a difference in performance. Keep the original observations available and explain which differences are meaningful for this comparison.
Working notes
This reference collection concerns light, offline dimensional-inspection layouts. It brings locating concepts, component descriptions and revision records together without substituting for an engineered fixture design. The drawings are original explanatory diagrams. Reference IDs identify documents, not commercially tested products. Read the scope and limitations alongside each example, and keep the actual part drawing and inspection requirements available when reviewing a proposed layout.
Practical example
Use an origin marker, positive axes and a unique position label for every component stack.
| Reference record | Interpretation |
|---|---|
| A38 | Base plate coordinates |
| Scope and purpose | A coordinate grid is a location reference, not necessarily a dimensioning or tolerance system. Define its origin and orientation. |
| Limits and interpretation | A grid intersection alone does not specify a mounting thread or interface. |
Review checklist
State the comparison question; align context and labels; list common features separately from differences; leave unsupported conclusions open.