Gate location is a complex subject that involves many factors. Every part is different, so it is impossible to give exact rules on where and how to locate gating. Before selecting the type of gating use the following checklist:
·         What are tolerances on for instance flatness, roundness, parallel surfaces etc.
·         How critical is the mechanical performance, particularly on glass fibre reinforced thermoplastics
·         How large is the series
·         How cost critical is the component
·         What areas are aesthetically critical
·         Are there specific high load areas where you need to avoid weld lines
·         What is the general load direction
As with any design parameter, assembling these data before starting to make the design will make it easier to make the right choices, and will avoid expensive corrections in future.



Some common guidelines:

• Try to position the gate on the thickest section of a part. If this is not possible, consider re-design of the thick section
  
• Do not inject straight into a thick section. This can cause jetting, resulting in bad surface finish and low mechanicals
  
•  Avoid long flow paths
  
• Line up fibre direction with the general direction of the loads on the part
  
• Don´t put gates in high stress areas