I see a lot of aluminum extrusion drawings and am never surprised at how little information engineers put on their prints. The notations on the left however are fantastic. This gives the extruder enough information (the drawing is not shown to protect the company’s IP) to quote and build the job.
The key information spelled out here is:
- Cut length
- Alloy
- Finish
- Flatness
- Straightness
- Twist
- Surface defect tolerances
- Packaging