- How do I know which digging tip to choose?It depends on what you want to do. We only have two speartips and both work well in most conditions. Hardfaced speartips (with tungsten chips) are more suited for rocky country where tungsten tiles may be chipped off. Knifepoints are used for rhizoctonia or to dig underneath the seed. Delta wings are used to apply gas some distance away from the seed. These tips are all interchangeable using a rollpin. For more heavier going, fit a 380mm (15") or 560mm (22") sweep to each tine for full cultivation depending on row spacings. We find on our 333mm row spacings machine 380mm (15") sweeps on the front two row and 560mm (22") sweeps on the rear work well. To inter-row cultivate simply offset the Multiplanter via GPS autosteer, or raise and pin the tines over the rows to cultivate between the rows. Fitted via a bolt/nut. For even heavier going like cotton pupae busting, fit a 50mm (2") chisel point. It is also attached to the tine via a bolt/nut.
- I keep hearing about this 15 degree speartip soil entry angle. Why is it so important?15 degrees enables a very low profile, so the speartip moves through the ground like a submarine. The little wings on the side of the speartip allow the soil to flow back into the trench, creating a seedbed with tilth. Very little horsepower is required to pull a tip at this angle which saves fuel.
An angle less than 15 degrees will cause the tine to heel out, which in turn causes a whole host of problems which may include:
- The back of the tine and underside of the speartip wearing away, - Inadequate soil flow over the wings and back into the trench, - Loss of a seedbed and tilth, - There is a high chance the seed tube will get blocked up with mud, - The seedbed trench may get smeared, making it difficult for young seedlings to emerge, and - The speartip will probably be cutting into the soil at a much higher and therefore wider point, wearing it away quicker, and increasing the draft on the tractor (meaning you'll use more fuel as well).
Just in case you didn't get the picture - IT'S IMPORTANT YOU DON'T ALLOW YOUR TYNES TO HEEL OUT! An angle greater than 15 degrees will cause the soil to be bulldozed and thrown out of the trench, because the speartip point is not able to pierce the ground. The higher, wider part of the speartip will dig in, creating a greater draft, and using more fuel. Speartips will also be worn away much quicker. There is a very simple test to ensure you have the speartip soil entry angle set at 15 degrees, so there is no need to worry about it being a complicated operation.
- What are hardfaced speartips?Hardfaced speartips are made from cast iron and have runs of hardfacing wire with tungsten chips embedded in them for hardwearing. Moist soil gets trapped between the hardfaced runs, causing the soil to wear on soil, thus extending the life of your speartip.
- How can the digging tip penetrate with so little pressure on it?The long rear lead of the C shaped tine enables it to hook into the ground naturally under its own weight in normal conditions. The Multiplanter itself is much heavier than the majority of our competitors, and so the weight of the frame spread across the tines helps them to penetrate as well. The 15 degree soil entry angle of the speartip enables a low profile with just a 50mm (2") speartip. All these factors together help keep the pressure requirements down.