How do i thread the bobbin on simplicity fashion pro sw 2145

try changing the needle--make sure the needle is the correct one for the thread and fabric being sewed
make sure the top thread has not come off the thread take up lever
try a different bobbin--just in case bobbin is damaged
make sure the bobbin is turned counter clock wise in the bobbin case

Change everything! Rewind the bobbin with new thread and correctly...the thread should be evenly distributed on the bobbin and wound on slowly or it will be too tight. Use a new needle and be sure it is facing the correctly and not backwards ( needles have a front and back). Clean out the bobbin case with the little pipe cleaner brush. Rethread the machine and make sure it hits all the stations ( uptake lever, tension discs, etc...) and make sure the thread is unwinding in the correct direction( clockwise on some machines and counterclockwise on others) check the manual. Exhausting but usually works! Good luck!

here is a link for a manual and parts for the machine

http://www.sewingpartsonline.com/simplicity-sw2145-sewing-machine-parts.aspx

here's 2 links for a manual for the machine, they're different prices
http://www.sewingpartsonline.com/instruction-manual-simplicity-sw2145.aspx

http://www.sewingpartsonline.com/instruction-manual-simplicity-fashion-pro-sw2145-download.aspx

On the bobbin case there are two screws, one large and one small, when you put the bobbin in the case you should be able to pull the thread through with slight resistence, if it is too loose tighten the large screw a quarter of a turn clockwise and test sew and repeat if necessary, top tension about 4 or 5, make sure the bobbin turns anti clockwise in the bobbin case

Is the case in correctly, in the correct direction so that the thread is not unwinding?? Also make sure area is free of dust, threads & has been oiled recently.

i was able to find one at www.ifixmachines.com

Tania,
I'm trying to find a manual for a Simplicity SW2145. If you have any suggestions I greatly appreciate some help.

Thank You,
J. Eise

From the Simplicity Sew Precious Model SWSP2 manual:
Inserting a new bobbin:

1. Place wound bobbin into the bobbin case.
2. Pull about 6 inches of thread out from the bobbin. NOTE: Be sure that the bobbin rotates COUNTER-CLOCKWISE when thread is pulled.
3. Pass the thread from the bobbin, under the bobbin case spring, and toward the back of the machine.
4. Slide bobbin cover back into position.

You can obtain a copy in pdf format for free at:
http://www.simplicityhomecare.com/ftp/whitepapers/SWSP2-english.pdf