More Techsew 2750 Issues.

[kgg]

2 hours ago, Sewman said:

But what is important is that the long needle scarf/groove needs to be on the right side. 

Like @northmount said you should checkout that link and NO the groove side of the needle needs to be on the Left.

You never said what type or size of needle you were using with what size thread in how thick of material, leather or fabric.

If you are sewing leather you need the correct size of needle a 135 X16 in the correct size and for fabric you use 135 x 17 needles. There are a lot of other factors that can cause a machine to not sew or sew properly, top threading path to the needle, thread tension, how the thread comes off the bobbin, incorrect needle installation to name a few.

It would be nice to see some photo's of how you threaded the machine from the thread spool holder to the tip of the needle.

Chances are this is a simple problem that you should be able to solve yourself with the help / suggestions of members here.

You should download a copy of the JUKI LS-341 engineering manual as the Techsew 2750 is a clone of the Juki LS-341.

kgg

[Sewman]

17 hours ago, Northmount said:

You need to look at the anatomy of a needle.  The scarf and groove are on opposite sides.  The scarf lets the hook get closer tot he needle to pick up the loop that is formed as the needle rises.  The the top thread comes down the groove.  It reduces the drag as the needle is descending, and thread is protected from shredding that would otherwise occur.  See the link below.

https://www.schmetzneedles.com/blogs/blog/sewing-machine-needle-anatomy

 

OK, thanks for the info !