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Install a brand new needle. If it still won't pick up the bobbin thread, the machine may be out of time. Search for sewing machine timing or take it for service.
Install a brand new needle. A bent/dull/damaged needle sometimes will not pick up bobbin thread.
Check that the needle is installed facing the correct direction.
Also check that the bobbin is wound smoothly, the bobbin is turning the correct direction in the bobbin case, and the bobbin tension is threaded correctly.
If it still will not pick up the bobbin thread, there is most likely a timing issue, ie the needle is arriving at the wrong time to intercept the bobbin thread. Search the internet for sewing machine timing discussions or take it for service.
First, install a brand new needle. Used/worn/bent needles will sometimes fail to pick up the bobbin thread.
Make sure the bobbin is installed correctly in the bobbin case.
If it still will not pick up the bobbin thread, most likely the machine is out of time (the needle arrives at the incorrect time to intercept the bobbin thread). Take it for service or search the internet for web sites or videos dealing with sewing machine timing.
check the needle to make sure that it's inserted correctly, the flat side of the needle goes to the back of the machine,, and make sure the needle goes all the way up into the needle cavity .
make sure the bobbin is correctly inserted
clean under the needle plate area & in bobbin area for loose threads or lint
if none of the above work & the needle is still hitting something then it 's a great possibility it's out of time & needs to be serviced, cause the needle should not be hitting anything when it goes down.
Check the timing of the needle to the hook.
Here is a guide to generic principles of Timing
http://www.sewusa.com/Sewing_Machine_Repair/Sewing%20Machine%20Hook%20Timing.htm
Best Wishes
Martyn
Bargain Box in Australia
If you're not picking up a bobbin thread, it's either a timing issue, or the hook/needle clearance. Usually, with the hook/needle clearance the skipping stitch problem will be intermittent. If it's a timing issue, it may not pick up the bobbin at all.
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