The countersinks standard demonstrates conditions of machined countersinks that meet Xometry’s quality standards. The examples included below showcase parts that meet this standard and others that do not meet this standard.
Xometry’s Countersink Standard
- Countersinks shall be round and made to print specifications and allow the proper designed fit with the mating screw.
- Countersinks should be free of burrs, chatter, or other tooling defects.
Review print specifications thoroughly before beginning part production. Ensure the countersink is machined to the correct tolerance to allow for proper fit of the mating screw. Milling defects should be avoided to allow for the proper fit of the mating screw. If the machined countersink in question does not meet this standard, the part should be reworked and inspected again 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 countersink shown above is round and machined to print size without chatter, ragged edges, or burrs.
Countersinks made to print tolerances allow the proper designed fit with the mating screw. A countersink made under print tolerance can lead to the mating screw set high allowing for scratching and poor fit of mating parts. A countersink-made overprint tolerance can lead to the mating screw set low and can create a weaker than designed assembly.
Does Not Meet Xometry's Quality Standard
CounterboresWitness marks on the surface of the finished component are not permissible as they can be perceived as poor quality.
The image above shows unacceptable chatter marks that exceed the print surface finish can lead to less than full contact of mating surfaces which can impact the functionality of the assembly.
Torn or ragged edges where the hole breaks through the metal can lead to holes that are larger than tolerance. Ragged edges may also result in chips, which can contaminate the part.
Oblong holes where one side (A) is larger than the other (B), as shown in the example above, can lead to less than full contact of mating surfaces and can create a poor assembly.