Discussion
Which one of the following CANNOT impart linear motion in a CNC machine?
Answer: D
The answer is chain and sprocket.
A CNC axis needs a drive that converts motor rotation into precise, stiff, backlash-free linear motion of the table or slide. The three other options are the standard ways of doing this. A linear motor produces linear motion directly. A ball screw turns rotation into translation through recirculating balls, with very low friction and backlash, and is the usual CNC feed drive. A lead screw does the same through sliding threads and is used on simpler machines.
A chain and sprocket transmits rotation between shafts. Its slack, stretch and the polygonal action of the chain on the sprocket rule it out as the means of imparting the accurate linear motion a CNC axis needs.
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