Here is an article written by our engineering team that will guide you on the ISO 2768 based tolerances that Factorem bases its machining standards on. Tolerancing can greatly influence the way in which parts fit together into an assembly and is thus extremely important. If you submit a part, with incompletely listed tolerances, these are the standards that we follow.
Tolerance refers to the permissible degree of variation for a particular feature or geometry of a part. Tolerances are carefully taken into account when a part or assembly is designed, to better suit practical machining and assembly limitations that may lead to deviations, affecting the end use-cases.
As we know, machining is a process that can be carried out in differing levels of accuracy and precision. The closer or tighter that we control features, the more expensive it gets, this is because the operator or machine has to spend longer performing the task. Moreover, for general use cases, controlling features very tightly has no merit, since end use-cases can be satisfied with parts of relatively lower precision and/or accuracy. If a part is dimensioned correctly, the designer’s intent, thought process and assembly requirements are all clear to the machinist.
This paper highlights Factorem’s internal machining tolerance guidelines, to be followed in the following use cases:
General tolerances for linear and angular measures fall into one or more tolerance classes (as stated in ISO2768-T1 and ISO2768-T2), indicated in the following sections. The default tolerance guidelines for each of these have been indicated in the relevant sections as well.
This document states the relevant tolerance standards at Factorem. Factorem has followed relevant ISO standards (ISO2768-T1 and ISO2768-T2) to derive these guidelines.
If the customer requires tolerance classes deviating from Factorem’s standards, then he/she must indicate this on the technical drawings, to be provided with the relevant 3D files.
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