For a 12x8 to 8x8 S+D Change cheek elbow with a 6" throat radius, what is the cut size of the heel of the elbow?

To determine the correct cut size of the heel of a 12x8 to 8x8 S+D change cheek elbow with a 6" throat radius, several factors need to be considered: the dimensions of the elbow and the throat radius.

The term "change cheek elbow" refers to a type of elbow that transitions from one size to another while incorporating a change in direction. The throat radius affects the dimensions, particularly in the calculation of cut sizes for sheet metal fabrication.

The larger dimension of the elbow is typically aligned with the inlet, which in this case is 12 inches. The smaller outlet dimension is 8 inches. To accommodate the throat radius when determining the cut size of the heel, you calculate the sides of the elbow plus the added length from the radius. This involves adding the radius to both dimensions, then considering the transfer of the elbow angle and any additional allowances required during the actual fabrication process.

The option that represents a cut size that properly takes into account these calculations and ensures a suitable fit for this specific change cheek elbow configuration is 27 3/16 x 10". This cut size properly balances the necessary dimensional adjustments due to both the reductions in size and the specifics of the throat radius.