Fixed or variable tilling widths on cultivators, tillers and rotavators

Most cultivators, tillers and rotators have a fixed tilling width, and the smaller electric machines generally do not have a variable working width. 

 

However, a few of the larger and more comprehensive front tine tillers have variable tilling widths. 

 

The way this works usually is that you can remove outer tines so you can reduce the usual width and narrow the working width to, for example, work between rows without causing damage.