"IF YOU CAN DRAW IT, WE CAN MAKE IT!"TECHNOLOGY FOR THE 21ST CENTURY
Match Bucket with Other Excavator Parts II
In general, if the tip life is less than 200 hours, then we would recommend an extreme-duty bucket, but if the tip life is between 200 and 400 hours, a severe-duty bucket usually works well.
Longer tip life points to heavy-duty and general-duty buckets. However, there are exceptions to the tip life guidelines. For example, in a limestone quarry, the tip life can be very long, in excess of 900 hours. Then, it’s more useful to consider the impact conditions. Impact is related to the quality of the shot. In the limestone quarry application, the wear material on the bucket isn’t so much for wear as it is for impact resistance. In many hard limestone quarry applications, we recommend no less than a heavy-duty bucket, and we may recommend a severe-duty bucket because of the impact conditions.
Most buckets are set up with spade or straight edges. Spade edges offer better penetration and faster cycle times in harder materials. Straight edge configurations provide for better cleaning and finishing work. Quarry-style buckets are often configured with spade edges, where penetration is the primary requirement, and excavation buckets used in soil work and trenching normally have straight edges.
Some studies have shown a strong relationship between tooth count and production, and there is actually a tooth spacing ratio that engineers use when designing buckets. In hard-to-dig rock, a lower tooth count will result in better penetration, just like the spade edge, which yields faster cycles and better production. For that reason, the buckets offered for production quarry work have a wider tooth spacing.
In addition, there are two defining aspects of bucket teeth, adapter size and tooth tip. The rule of thumb is to use the smallest adapter size that doesn’t suffer nose breakage. The theory is that the smaller size delivers the best penetration and lowest weight. There are guidelines for adapter sizes for each machine. And tips are available for different applications.
You can tell if the tip is correctly specified or if the tip stays sharp in the application. A tip that blunts is too big (has too much wear material), and the user should drop back to a sharper tip. It’s important to discuss the particular application with the excavator parts rep to get the best advice for tip matching. Remember, too, that wheel loaders are a different story because of their digging geometry.
In a word, only by matching the bucket with all other excavator parts with regarding to the working condition, can you perfectly complete your work, without any delay.