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Clamp (tool) For other uses, see Clamp. A clamp is a fastening device used to hold or secure objects tightly together to prevent movement or separation through the application of inward pressure.
The spindle is usually the strongest part and is supported by large bearings. Whether the spindle holds the work or the tool, an automatic clamping feature allows the spindle to rapidly clamp and unclamp during the program run. Cast iron or Meehanite used to be the material of choice for metal-working machines.