Xometry’s standard for mill steps, tooling, and chatter applies to metal fabricated products. This standard demonstrates the results of toolpathing that meets Xometry’s workmanship standards.
Xometry’s Standard for Mill Steps, Tooling, and Chatter
- Tool marks should be burr-free and should be within dimensional and surface roughness specifications for the part.
- Critical surfaces should be clean and free of steps and marks across the entire face and any edges.
- Milled surfaces should be free of chatter marks, tool gouges, and any other tooling defects that do not meet part specifications.
When toolpathing a part, take care to select the right tool size, end mill type, and cutter speeds and feeds in order to avoid tooling defects. Milling that results in apparent mill steps, tool marks, and chatter marks introduces risk in the part function, potentially risking the quality requirements of assembled products and subsequent operations. Apparent tooling defects do not meet this workmanship standard and should be reworked before shipping to the customer. Contact Xometry’s Case Management team with any concerns by selecting “report an issue” in the portal for the job in question.
Meets Xometry's Quality Standard
The cutter marks shown on the surfaces in the part example above are burr-free and are within dimensional and surface roughness requirements.
The port spotface in the above example is free of steps and marks across the entire surface and surrounding edges.
Does Not Meet Xometry's Quality Standard
In the example above, the cutter has left a burr between passes at the bottom of the part. The burr exceeds the surface finish tolerance on the print and does not meet the Xometry workmanship standard. This can lead to marking or incorrect fitting of mating components.
Chatter marks in the example above are a result of cutter vibration. The resulting surface finish does not meet standards.
Cutter marks and gouging create a surface finish that is out of specification. This can result in failures or rework in subsequent operations (e.g. nylon adherence failures or assembly fitment issues).
The port spotface in the example above did not clean up the surface and surrounding edges completely. Inconsistent milling on critical faces can cause assembled components to not sit flat and have an overall appearance that does not meet Xometry’s standards.