Which type of gear is used to convert rotary into translatory motion?

Which type of gear is used to convert rotary into translatory motion? Correct Answer Rack and pinion

Rack and pinion type of gear is used to convert rotary motion into translatory motion. In spur gears teethes are parallel to the axis and used for transmitting power between two parallel shafts. In helical gears teethes are inclined with the axis.

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The gear used to convert rotary motion into translating motion is