Machine Tool Design 1

Machine Tool Design 1 - Praca Zbiorowa

The concept of error budgeting as an analysis tool has been applied in precision machine tool design to predict and control the total error of a machine where it is important to define the accuracy, resolution, and repeatability of the operation [58]. The concept of error budgeting was introduced by Donaldson [59], as a technique to improve the accuracy of diamond turning machines, and later specific design methodologies and approaches were developed by researchers to improve fabrication and measurement tools [60–62]. The key assumptions in error budgeting are: 1. The total error in a specified direction is the sum of all individually propagated errors in that direction. 2. The individually propagated errors can be isolated and controlled. As micro/nano-fabrication processes, microscale AM tool designs must have well-defined sources of systemic and random errors which can be combined to evaluate to the total error of the machine [61]. Without an initial understanding of these errors for a specific design, it is difficult to ascertain whether the errors would be comparable to the desired part resolution, which is a critical requirement for any microfabrication process. Therefore, it is important for a precision design engineer to identify the different kinematic and thermal errors that can exist within the system, analyze their nature (deterministic or non-deterministic) and develop mathematical models to account for them.