Offset Disc Plough vs Tandem Disc Plough
Sep 18, 2024 Posted by Ian Pritchard

When looking at Disc Ploughs one of the important questions that comes up is the choice between an Offset Disc Plough or a Tandem Disc Plough and the advantages and disadvantages of each type of machine.
Hi, my name is Ian, and I am a Sales Consultant here at Delmade. I’ve spent the last 22 years working in the Agricultural industry starting out on the factory floor as a Welder and working my way through the ranks as Factory Forman, Production Manager and finally into Procurement and Sales.
In this blog, I’m going to share my insights into the differences between a Tandem and Disc Plough and give you the knowledge to make a choice between the two that will best serve your farm and the tillage outcome you are chasing.
To be upfront here at Delmade we manufacture Offset Disc Ploughs and primarily sell these against Tandem Disc Ploughs.
Offset Disc Ploughs
Offset disc ploughs feature two sets of discs arranged one in front of the other and slightly staggered, with the pull being slightly offset (hence the name). This design is particularly beneficial for leaving a flatter finish due to their longer overall length and having the gangs cross the full width of the machine. Offset disc ploughs are known for their efficiency in cutting through heavy stubble or overgrowth, making them a preferred choice in areas where residue management is a priority.
The offset configuration also provides better trash clearance, preventing the accumulation of crop residues or trash on the implement.
The simplicity of only having two gangs to adjust is a major time saver in the field, but more to the point it means that it is a far simpler job to get the machine running correctly so as to leave a better finish with no ridging or hollowing.
Another advantage is the inline wheel system, this will lift, turn and transport smoother and also have the benefit of having fewer moving parts to wear and maintain. It is also a lot easier on tyre wear as it is not scuffing on cornering or turning.
The only real disadvantage of an offset configuration is the overall length of the machine when in extremely hilly ground and the fact that you can be limited when it comes to width when folding as the gangs can become too high or will touch in the middle.
They can also be a little harder to pull due to their tendency to bite in a little more and cut deeper.
The angle of the cut in offset disc ploughs is typically adjustable, allowing the tillage depth or finish to be customised according to specific requirements.
Advantages
- Flatter finish due to longer overall length.
- Efficient in cutting through heavy stubble.
- Better trash clearance, preventing residue accumulation.
- Adjustable cutting angle for customised tillage depth.
Disadvantages
- Longer overall length may pose challenges in extremely hilly ground.
- Limitations on width when folding, especially in the middle.
Tandem Disc Ploughs
Tandem disc ploughs are designed with either three or four sets of discs arranged in an X or cross formation, often with one longer gang the width of the machine and a half-length gang sitting in front and behind. This configuration allows for a shorter and more compact machine.
One of the key advantages of tandem disc ploughs is their ability to follow the sharp contours of the land making them well-suited for undulating terrains and conditions. They will also tend to track very straight behind the tractor.
Another advantage with a Tandem is the wider machines can have the gangs swing around for transport instead of folding up, although this makes the machine very long in transport, some consider it safer than having a gang that needs to lift and fold overhead.
One major disadvantage of a Tandem disc is that it will often leave a hump/ridge or a hollow along the finished ground. This is due to the two smaller gangs not being joined in the centre, allowing any change in the speed or soil conditions to affect the finish. This can be adjusted out in some situations but as soon as you have a minor change in soil, speed or moisture the issue will be back. This is recognised by feeling a wave or bouncing motion when driving across the finished paddock.
Another disadvantage is that often the transport wheels are not aligned across the machine, while this helps keep the machine short and compact, it also means that it tries to skid or scuff when you turn in one direction, it can also negatively affect stability when being towed on the road.
Traditionally a lot of early designed machines were in this configuration as overall size was considered more important than ground finish. This has changed a little over the years as our farming evolves to use wider and wider machines like mowers and rollers etc which are not suited to unpredictable ground conditions and where an emphasis is placed on a level post discing finish for easy sowing.
The angle of the cut in tandem ploughs is typically adjustable, allowing the tillage depth or finish to be customised according to specific requirements. The tandem disc plough can be a good choice for farmers just needing to just “Get er done”.
Advantages
- Adaptability to undulating terrains.
- Ability to swing gangs around for transport, enhancing safety.
- Adjustable cutting angle for customised tillage depth.
Disadvantages
- May leave a hump or ridge in the finished ground.
- Transport wheel alignment can cause skidding or scuffing.
- Limited suitability for wider machines in unpredictable ground conditions.
Factors to Consider
When comparing an Offset or Tandem Disc plough it is important to consider the following factors:
Soil Type / Conditions and Finish
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- Offset disc ploughs excel in penetrating hard and compacted soils and will provide a level seed ready finish. Offset Disc ploughs will also cut through heavy crop residue with ease.
- Tandem disc ploughs can be a useful tool in hilly conditions where finish is not as critical but they do often finish with a hump or hollow. But they do struggle in heavy residue conditions and may block up.
Transport
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- Tandem disc ploughs offer a slightly more compact machine - but the wheels can scuff & cause issues.
- Offset disc ploughs can also be folded but not quite as compact as a tandem plough - however, the wheels are inline and wont cause issues.
Overall, the Offset configuration is probably the most common choice for contractors and farmers alike due to its simplicity and ability to give a better finish in most conditions. Both types of disc ploughs have their merits, and the choice depends on the specific needs and priorities of the farmer or contractor.
So, what’s next…
It really comes down to looking at what you want to use it for and deciphering what is important to you. If you’re still unsure, we’re here to help. Reach out to Delmade or if you’re not ready to speak to someone yet check out the learning centre for more information on disc ploughs and also the product listings for full specifications of the disc ploughs we offer.
Ready to talk or have a question? Give us a call on 1800 335 623 or Enquire Now →