Features of size with location tole

Features of size with location tolerances of 5mm or greater can use a sight check. Anything less than 5mm will use a stab pin check, unless otherwise authorized. 2.8.7 All surface sight checks and scribe lines must be 3 mm clear from part surface with a minimum depth of 3 mm. Sight checks must be made to virtual condition. 2.8.8 All check elements must be normal to part surface, where applicable. 2.8.9 Check rails must be built to a nominal 3mm gap and 0mm flush. For large, flexible plastic parts, 6mm gap checks maybe requested. 2.8.10 Trim Edges checks must be built to a 0mm nominal condition. 2.8.11 Gap and flush check rails must have a minimum thickness and width of 25mm, where possible. The surface must be cut to an extension of the tangent surface of the part. See Figure 4 - Check Rail Geometry below for details.