Juki 5410 breaks bobbin thread

[alpinelite]

Hi,

I was using my Juki 5410 Needle feed with Coats Epic80 Tex40 without any issues. Now I swaped to bonded nylon Coats Nylbond 60 tex45 and the bobbin thread snaps while I sew. I start normal but during the sewing there is  a noise as if the thread gets overstretched (stretching string sound) before it snaps.  Otherwise the seam formation looks fine.

The bobbin was inserted anticlockwise.

Thoughts?

Thanks

[toxo]

  On 3/7/2024 at 7:49 AM, alpinelite said:

Hi,

I was using my Juki 5410 Needle feed with Coats Epic80 Tex40 without any issues. Now I swaped to bonded nylon Coats Nylbond 60 tex45 and the bobbin thread snaps while I sew. I start normal but during the sewing there is  a noise as if the thread gets overstretched (stretching string sound) before it snaps.  Otherwise the seam formation looks fine.

The bobbin was inserted anticlockwise.

Thoughts?

Thanks

Expand  

Even M60 is very strong. Sounds like your thread is not clear to the needle. Or the bobbin isn't seating properly.

Edited March 7, 2024 by toxo

[kgg]

  On 3/7/2024 at 11:36 AM, toxo said:

Now I swaped to bonded nylon Coats Nylbond 60 tex45

Expand  

My first thoughts based on you are sewing the same type of material and thickness of material previously sewn.

i) The bonded nylon thread is a touch thicker and stiffer then the polyester. Did you re-adjust the bobbin tension when you changed to the bonded nylon??? 

ii) Recheck you top thread path.

iii) Change the needle.

iv) Check to make sure there is no link / thread under the bobbin case

v) Insert a properly wound fresh bobbin that is loaded to about 80 percent capacity.

kgg

[toxo]

  On 3/7/2024 at 12:20 PM, kgg said:

My first thoughts based on you are sewing the same type of material and thickness of material previously sewn.

i) The bonded nylon thread is a touch thicker and stiffer then the polyester. Did you re-adjust the bobbin tension when you changed to the bonded nylon??? 

ii) Recheck you top thread path.

iii) Change the needle.

iv) Check to make sure there is no link / thread under the bobbin case

v) Insert a properly wound fresh bobbin that is loaded to about 80 percent capacity.

kgg

Expand  

Not my post Keith.

[kgg]

  On 3/7/2024 at 12:31 PM, toxo said:

Not my post Keith.

Expand  

Sorry about that. I'm not sure how that happened. Damn computers.

  On 3/7/2024 at 7:49 AM, alpinelite said:

Now I swaped to bonded nylon Coats Nylbond 60 tex45 and the bobbin thread snaps while I sew.

Expand  

My first thoughts based on you are sewing the same type of material and thickness of material previously sewn.

i) The bonded nylon thread is a touch thicker and stiffer then the polyester. Did you re-adjust the bobbin tension when you changed to the bonded nylon???

ii) Recheck you top thread path.

iii) Change the needle.

iv) Check to make sure there is no link / thread under the bobbin case

v) Insert a properly wound fresh bobbin that is loaded to about 80 percent capacity.