French Seams with a Double Needle Sewing Machine - Car Upholstery

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Just to say a double needle post bed sewing machine is of great help in case of doing 'double stitches' /'french seams'.
For this demonstration on leather material I am using a heavy duty Durkopp&Adler 268-FA-273 sewing machine.
The big foot was especially designed for this purpose. It has a blade as a guide in its center that follows the groove left by first closing seams.
The two needles were graduated at a distance of 10 mm between them. The lenght of stitches are 6 mm.
The first sample in black leather shows a seamles french stitching that could be used for armrests, consoles and dashboards giving a flat appearance.
The second sample was done on leather 1.3 mm thick with a foamed backing of 5 mm thick. The leather edges were not skived. We would realize the stitches on inside seams are shorter.
The third sample shows how useful is a post bed machine while sewing rounded covers. The leather edges were skived at 1 mm. There is also a foamed backing material of 3 mm thick.
I hope you find some inspiration in this video!
Cesar