As far as I know, many friends in screw industry are very interested about the design process of self-tapping Chicago screw base hole. However, not many people really understand its design process. So I will analyze the design process of self-tapping Chicago screw base hole today.
1. view
Graphics include the expanded part and the bending part of the workpiece. There is no corresponding relations of three view drawing. Generally, It should be marked "expanded figure" or "bending figure". Expanded figure must be drawn according to the proportion of 1:1. While bending figure do not need to be drawn to scale. The drawing must mark the folding marks and bending direction.
2.The rules of layer color
White-- contour line(the IP secant), green-- dimension line, red-- center line, light blue-- blocking line, yellow-- fine line. Etching line must adopt the non-white layer, and mark "sculpture".
3.Expanded figure should be drawn by medium tolerance.
For the artifacts cut by laser, if the tolerance zone of the hole is less than 0.1 mm, the hole generally should be drawn small 0.3 mm according to nominal size, and mark the size of chambering or reamed hole.
4. laser cutting
The size of Chicago screw base hole cut by laser should be drawn according to the rules of data.