Previously we discussed the importance of dimensions and tolerances in the specification of solder preforms, however these data points are best expressed in the form of an engineering drawing. You may be thinking, “Why would I make a drawing for a rectangle?”. Even if you are specifying a simple rectangular preform, an engineering drawing still contains a considerable amount of critical information that needs to be presented clearly. And, an engineering drawing is the best way we have found to organize and present that information. Here are the basic points that should be expressed on even the simplest of preform specifications:
- All X/Y/Z dimensions
- Tolerances
- Measurement units
- Part or drawing number
- Company/engineer/date info
- Material
- Flux type and weight %
- Any special considerations or references (like maximum burr dimensions or relevant regulations that must be followed)
If you keep these points in mind and include them in your engineering drawing, you will have answered many of the questions we will need to ask otherwise. Efficiency! This will help speed the process of making the preforms and getting them in your hands.
*This post is part of the World of Solder Preforms series