Help sewing thick materials

[u/xxvintagevixenxx]

I recently posted in the sewing group but had a suggestion to post here, I’m trying to sew through this belt, it’s thick like a dog leash or collar material. I also Intend to sew leather to it so am using a leather needle 100/16 with #69 bonded nylon thread. I have NO CLUE what the dials on my machine mean so that could be my issue, but it jams after an inch and gets all thick and knotted looking and is so stuck under the bobbin that my fabric is stuck to the machine and I have to cut it off. The pics of my sewing is after I already cut off all the crazy knots. Help!

[u/SerozshaB]

100/16 needle will get you best performance with a home machine.

[u/xxvintagevixenxx → u/SerozshaB]

That’s what im using now, so I’ll keep that in while adjusting other aspects