Good morning, I am slowly getting into more mold designs and realize that most of my calculations for runners and gating size is passed down to me from past experience from more experience mold designers. Are there formulas that I can use to figure out runners and gate size for parts that are easy to figure? Or of any books that I can get that will help explain this more easily? I would really appreciate it.
There is an excellent but old book called Injection Mould Design by R G W Pye (ISBN 0-582-01611-8), but I am not sure if it is still in print. It gives you the empirical relationships for the gate and runner sizes in both metric and imperial sizes. They are however empirical and experience soon takes over!
The relationships are not so that I could quickly summarize them for you as there are constants that come off graphs but if you are stuck email me off forum and I'll see what I can do.