Originally Posted by
vmaniqui
why is it that of all the parts in that machine, they decided to put a fiber gear instead of a metal one. why oh why. now i can't brag about my 201-2 of being an all metal machine. is this true for all singer sewing machines or just the 15-91 and 201? hmm i wonder how durable that is? thanks for posting.
Typically the metal/fibre or metal/plastic gear combo is used for two purposes: one being a mechanical "fuse" to prevent major gear damage in the event of a bind-up and the other being to reduce operating noise level of the machine.
They are usually located between the drive shaft and other gears, in the event of stoppage of the gears to prevent the drive shaft or motor getting toasted