The motion of a machine's parts when operating causes what type of wear?

The motion of a machine's parts during operation generally leads to what is classified as normal wear. This type of wear is a predictable consequence of regular functioning and is usually accounted for in maintenance schedules. Normal wear occurs as components interact with one another, gradually wearing down the surfaces over time. This process is typically manageable, as it follows expected patterns that can be anticipated and mitigated through routine preventive measures.

In contrast, terms like excessive, unexpected, or severe wear denote situations where wear occurs at an abnormal rate or due to unforeseen circumstances, such as misalignment, lack of lubrication, or operational anomalies. These types of wear can be detrimental and may lead to machinery failure if not addressed promptly. Understanding that normal wear is part of the operational cycle helps in planning for maintenance, ensuring that machinery operates efficiently and reliably over its lifespan.