The traditional heat process is very uncontrolled. The operator has no way of knowing where the camber is going to end up until after the steel is fully contracted and the steel is completely cooled. If the results are not enough camber, you have to go back and repeat the process by adding yet more heat affected area’s. Or worse yet if you have cambered too much, you will have to heat up the opposite side and try to reverse some camber back out. With the mechanical method you have live visibility during the entire process and are able to maintain a very accurate tolerance well within the standards.