Last week we had another of our training courses for service engineers and field service engineers1. The interaction with people actually working with our products is quite refreshing and every time I understand their issues better. One of those issues is that they have to discuss with the client are spares for the wear parts. In a planned maintenance context, wear parts are a little odd. Sometimes, they are worn away or break down unexpectedly. And that is the moment customers call for spares. We do have a lot of spares on stock, but sometimes even we run out of stock or we advise to use a special execution of the concerned part for the specific operation of the client. And then we have to inform the service people and the client that there is a long lead time. Several times, they are filled with disbelief and under such circumstances it is very difficult to explain the reasons behind it. So, that is why I developed this little game to experience the waiting time for special wear parts.
It is based on the old board game of ‘Snakes and Ladders’2. All it takes are the board, one dice and as much tokens as players. All start at the first position. The places are all phases in the manufacturing of the wear parts and each have their specific issues.
- Each pattern is used multiple times and wears down, itself. Also, some patterns have to be configured for the specific application, execution or material of the wear part.
- Moulding: the pattern is placed in a casting box and filled with sand.
- Sometimes there are more casting boxes needed and they have to be stacked carefully. Depending on the configuration, this step might be very short. Then you go directly from 2 to 4.
- Part of the casting system is already in the sand box with the pattern, but it has to be finished as the last part of the preparation.
- The material is melted in the furnace. This can take some time, depending on the size of the cast.
- The actual casting is done in minutes. Fifteen, at the most.
- But the cooling in the casting box takes weeks. Wait one turn.
- Sometimes the casting has not gone properly and the cast have to be done again. Back to square one.
- Satisfied with the cast, then it has to be touched up at the fettling station.
- A special heat treatment brings the final hardness and toughness to the product.
- The fitting surfaces of the wear parts have to be machined.
- Rotating parts have to be balanced. For non-rotating parts, this can be skipped.
- Then there is the bottle neck: quality control. If there is a deviation that can n ot be mitigated, you have to go back to square one.
- Depending on the location, transport can take weeks.
- Don’t start me about customs handling. Your anticipated spares are in bonded storage and customs is missing a document, wait some weeks or skip a turn.
- Finally, you’ve made it! Installation on the dredge.
- A well-trained team makes all the difference, Damen
- Snakes and Ladders, Wikipedia
- Do You Have Wear Parts For Spare?, Discover Dredging
- Options for Repairing Parts That Ought to be Replaced, Discover Dredging