Digga Tips - Which Auger to Choose for What Ground Conditions

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When drilling in different ground conditions you need the right speed and the right cutting system on the auger to suit the different ground conditions. So which auger should you choose for your application?For efficient drilling on any machine requires power (torque) and down pressure.

Digga augers perform better at an optimal RPM against the ground conditions they are against. Similarly the auger diameter will perform better at certain speeds. For example: the larger the hole and harder the ground conditions, the slower you will need to drill. The smaller the hole and softer the ground conditions, then more speed is required. 

As a general rule we recommend the following RPM/speeds:
55-65 RPM for general earth conditions.
45-55 RPM when drilling in heavy earth, clay or shale. 
20-45 RPM when drilling in rock.
Results will depend on rock hardness, type of auger being used and machine down force.

 Digga recommends the following for attachments for the different ground conditions:
  • When ‘general purpose’ earth drilling you can drill faster. The Digga A range of augers will be ideal here. These augers are also better for clay as the bladed teeth ‘shaves’ the spoil a layer at a time. Like scraping butter with a knife.
  • In heavy earth, clay*, soft chalky rocks you want an auger with tapered teeth. The Digga RC range of augers is the ultimate all performance auger and will cut cleanly into earth and chalky rocks. The teeth are tapered to be able to rip the fracturable rocky/earthy ground. *Please note, this range is not ideal for drilling in clay with smaller machines 4 tonne and under.
  • When drilling into rock you are going to be most effective at a slower speed with a greater amount of power. Too much speed creates too much heat and will actually ‘polish’ the rock smooth rather than chipping away at it. Too much speed will also cause the teeth to skip across the top of the rock and it will not be able to pick and rip into the rock to break it out.

For more information on our augers visit www.digga.com/augers or contact us at 1300 2 DIGGA. Stay up to date with the latest tips & trick by Digga on our Social Media channels.

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