A machine for aerating soil has a frame. A gear box is attached to the frame. A crank assembly is driven by the gear box. A parallel arm is pivotally attached to the crank assembly by a crank arm and is pivotally attached to the frame. A tine assembly arm is pivotally attached to the frame and is pivotally attached to the parallel arm at a fixed point. A rigid tine holder is pivotally attached to the tine assembly arm and is pivotally attached to the parallel arm and extends beyond the parallel arm.The connection of the tine assembly arm, parallel arm and tine holder to the crank assembly ensure that the tines are driven straight into the soil. The lack of arc ensures that the turf surface is minimally disturbed.