I have been asked by a customer to give them a new quote on machining a casting that is currently cast in 65-45-12 ductile. They want to know what the cost savings would be if it was machined from Class 30 Gray Iron. Is there a rule of thumb for quickly figuring a new time? I'm thinking in the way of a percentage factor such as adding or subtracting a certain percentage of the machine time to obtain a new time to go by. Thanks.
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