Hand Scraping Sets the Foundation for CNC Machining Accuracy and Long-Term Stability
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Hand scraping introduces carefully placed high and low spots on the mating surfaces of the CNC machine (see Figure 1). While it’s natural instinct to believe that flat surfaces would be better for machining accuracy, this is, in fact, not true. Two flat surfaces in contact on the machine will stick, creating inconsistent machining characteristics. Tight tolerances can only be achieved by adding high and low spots that hold oil and allow for gliding, rather than sticking. Introducing more contact points via the high and low spots also allows for balance and therefore perfect mating. With flat surfaces there is only one contact point, which creates a state of imbalance.
We do hand scraping because we know that lifetime cost of ownership and cost-per-part are reduced when you produce more, quality parts over a longer time frame.