Reverse engineer this bracket to a reasonable tolerance (+/- 0.020).
Assume the inside radius is equal to the material thickness.
Calculate the bend allowance and produce a working drawing of the flat pattern. Include bend instructions (indicate the bend using hidden lines and include a leader with the following text:
“BEND UP __°”
Also, be able to provide a 1:1 paper printout of any part of your pattern.
Answer the following questions based on your prints.
- What nominal metal thickness was the part constructed from? Look up sheet metal gauges to help you answer, and don’t forget to allow for the paint thickness.
- If this part is to be made from a rectangular sheet of steel, what are the minimum dimensions of the rectangle?
- What percentage of this rectangle is “drop” or waste?