Bobbin thread tension and thread color

[Gymnast]

Now I have put a few numbers of sewing again... 

I know, that more experienced people here already have told us, that the same type of thread from a thread manufacturer are different. Different by color and different by batch.

I did not think. that it mattered that much for the bobbin thread tension, but when I could not repeat the balanced stitch from some previous notes I tried to measure a bit more. It was a Amann Serafil polyester thread Tex 135, and for the same setting of the bobbin thread tension spring I got these measured bobbin thread tensions measured by a spring dynamometer:

White: 0.5 N (1.8 oz)  
Black: 0.6 N (2.2 oz)
Blue: 0.75 N (2.7 oz)

This is a video about how I measure bobbin thread tension, but I guess many of you have already seen it: https://youtu.be/kINRgj42GnI

[kgg]

1 hour ago, Gymnast said:

I guess many of you have already seen it:

Yes. I do like how you also included the drop test at about 4:21 in the video which you called the "yoyo". Since most people don't use a gauge for measuring tension knowing how to do the drop test can be very helpful starting point.

1 hour ago, Gymnast said:

It was a Amann Serafil polyester thread Tex 135,

I can only imagine some of the tensions you would measure using a non brand thread.

kgg

[friquant]

On 11/12/2022 at 9:45 AM, Gymnast said:

This is a video about how I measure bobbin thread tension, but I guess many of you have already seen it: https://youtu.be/kINRgj42GnI

I'm curious do you find it useful to measure the top thread tension as well?

[AlZilla]

23 minutes ago, friquant said:

I'm curious do you find it useful to measure the top thread tension as well?

An AndyTube video got me started measuring bobbin tension on domestics. One less variable. Most people don't bother.

 

[toxo]

I often sew different types of leather together and and sometimes of different thicknesses as well. I would never start sewing a project without first sewing a piece of scrap and adjusting tension (if necessary to ensure the "knot" is as central as I can get it.