Joudodo

thanks again sewmun!

Another question for you sewing experts. What kind of heat can an industrial sewing needle safely hold? If I sew a couple passes at a medium speed my needle heats up to the point where it's hot to the touch, but it quickly cools back down after a few seconds, then I sew again. I assume as long as keep the heat below a certain point this should be ok?

I am currently using a V69 polyester thread, does this seem appropriate for the job I'm doing? It seems to get the job done alright, which I guess is all you can go by when sewing.

Thanks a lot, I really know nothing about sewing but I am learning a lot.

awesome, maybe you can help me out with one final question. The picture I posted in the OP was sewn with a size 125/20 needle, what size would you recommend for a leather point needle making that same stitch?

Great thanks for the info, just for clarity what do the numbers in a 135x8 needle represent?

Thanks for the reply, it is the PLK-B0504. I've researched the needle system a bit and it should take any of the following 135x5, 135x7, 135x25, 1901, DPx5, and DPx7, however I'm not having much luck finding a leather point needle for any of these systems.

I'm sewing a leather end on a guitar strap (pic attached). The leather piece I am sewing is about .085 inches thick, I'm sewing the folded bit so I'm sewing through about an 1/8 inch of material. I broke a few needles so I have a few questions...first what size needle would you guys recommend? Second, I am using an industrial sewing machine, a Mitsubishi PLK-B series, and I am a little confused about industrial needle systems. Do I have to use a specific needle system for my machine or will any needle system work as long as its an industrial round shank needle? Finally what speed would be appropriate for sewing something like this? Thanks!