your needle needs to be the correct size for the thread being used- visit the Superior Threads website- where you can download & print charts that tell you which needle (type and size) to use with the different threads, (type and weight)...what each is good for- and plenty of hints, tips & help...it's a good resource. could be the problem is the embroidery needle- their *eye* is shaped differently and might be fraying the thread. also, if the needle has been used for more than 8 hours it might just be time to change it to a new one- correct size, type needle with the {corresponding} correct thread, type & weight will make a difference- as long as it's a nice, new, sharp needle....for quilting people generally choose a 'sharp', 'universal' or quilting needle. i would only use an embroidery needle if i was doing specialty, embroidery stitches as my quilting- then i would need to use an embroidery thread.