First of all,
I apologize for my first real post being a request for help but I am out of ideas.
I have searched with the best of my Google-Fu and have spent the last 45 minutes searching this forum. A few post concerning buying scuba webbing but no tech info.
I am an auto upholstery guy by trade. I sew through heavy stuff including 4 layers of vinyl and 1/8" Mahogany luan when making custom panels all the time. I am starting to dabble in making gear as a hobby and have started with belts. I cannot for the life of me get the tension set right when trying to sew up 2 layers scuba webbing as a base for the belt. I can always see the top thread making little "nubs" on the bottom stitch. (loose top tension). I crank up top tension and the thread will break after 4 or 5 stitches. I have loosened the bobbin thread and the stitches were almost good enough to start a project with, almost. The extremes in top tension to bottom tension cannot be right.
So my question is to you guys that work with this scuba webbing on a regular basis. What are your set ups? Needle sizes, thread being used and any other tips you might be able to give me. I know this is all hard earned info but I am out of ideas and ruined 10 yards of webbing troubleshooting. I also want to incorporate this stuff into some custom hot rod interiors as well. I have had zero problems sewing some pretty ridiculously thick stuff before, but this scuba webbing is killing me.
Current set up:
-Stitch length on 7
-Tried using #69 thread (best results) and #92
-Tried needles from 18 to 23.
-The closest setting that produced decent looking stitches was very tight top tension and bobbin tension pretty much non-existent.
Thanks in advance for any help or ideas.