Evaluate knowledge and experience: Evaluate the provider's website
https://www.honkaistarrail.wiki/index.php?title=A_Step-by-Phase_Guidebook_to_Precision_CNC_Machining:_From_Style_and_design_to_Production_46596
Assess knowledge and know-how: Evaluation the supplier's Site and inquire about their experience with your certain field or kind of machining venture