What thickness and precision do you all use for sheet metal models? What are the ramiifications?
We design in millimeters and use sheet metal gauges currently common in the US. For our sheet metal models, it is my preference to model a sheet metal thickness to the nearest tenth of a millimeter for the thicker gauges, to the hundreth for thinner stuff. I keep the model thickness inside the thickness tolerance. I might try to hit on the low side, since most sheet metal runs light.
I prefer to do this to keep the part dimensions easy. You can't always design on one side of the sheet - many times the thickness gets into the part dimensions.
Others in our department prefer to use the 3-place inch value shown in the charts and convert that to millimeters, no matter how many decimal places produces. Still others, more middle-of-the-road, prefer a millimeter value to two places as shown in some gauge charts.