Different Thickness Thread Top/bottom?

[Flattracker]

Hi again, sorry yet another question!

If the machine stitched leather has the top and underside both on show is it ok to use the same size thread in the machine and the bobbin?

What's the thinking behind using different size thread, is it thinner thread in the bobbin?

Thanks all

[Sovran81]

I prefer both threads be matched for equal strength. However sometimes thinner threads will be used in the bobbin so you dont have to change the bobbin as often. This become very apparent when you are pushing machine limits on the thread or using machines with very small bobbins.

[Wizcrafts]

Never mix thread sizes on a holster that will be worn by anybody in law enforcement or security work, or on a webbing tow strap, or any horse tack, or heavy dog collar/harness.. Use the strongest thread that allows you to bury the knots inside the layers. Use whatever size needle it takes to get the job done.

If absolute strength is not an issue, you can use 1 size smaller in the bobbin. Sometimes the thinner thread lays better on the bottom. It depends on the material. This may allow you to downsize the needle by one number.

[Rayban]

I bounced back and forth on this issue til I came up with the stitch I like best, that being 207 top and btm with a #24 needle...for the thickness of leathers I work with most, 1/4" to 3/8"...............different thicknesses require different combos (for me).

Edited April 7, 2014 by Rayban

[Flattracker]

Great, thanks all. Makes sense now.