Originally Posted by LINDA CATLEGE
Needle size? 12, 14 16?
Depends on weight of thread. Superior thread has a guide for their threads here
http://www.superiorthreads.com/educa...by-thread-type
You can probably make an educated guess by what they recommend for a similar weight of their thread to the embroidery thread you want to use. For example their 40 wt poly Rainbow, calls for a topstitch needle size 14. So if you are looking at a 40 wt embroidery thread that would probably work. If the thread is heavier you need a needle that is larger.