This is a test of a modified Pfaff 30 sewing Tex 135 thread in 6 layers of vinyl (600 g/m2). A universal needle size 22/140 is used.
0:00 Introduction with preconditions
0:17 Start sewing seam
0:53 Seam finished and removal of fabric
1:20 Inspection of stitches on top and below fabric
2:05 Other details about the needle size, stitch length, and thread tensions
2:31 List of the significant modifications to this sewing machine
2:37 End
You will find videos about the Modifications with Speed Reducer, Beehive Spring and Presser Foot with notch on this channel.
The max speed seen in video is 540 stitches/min, and then the universal motor speed is about 8000 RPM with a shaft power of 50 W. The estimated torque applied to sewing machine main shaft is then 0.9 Nm. However the short term torque at lower speed will be higher and about 1.8 Nm with this thread and fabric.
Please like the video if you find it useful. You are free to leave your questions and comments below.