I got some Cordura, thread and other bits, and did some testing to see how well my domestic machine would handle it. It turns out that I can sew 4 layers of 1000D Cordura with a double layer of binding nylon. That should be sufficient for most projects, but I am starting to look at used (or maybe new) Sailrite walking foot machines.
My question is how important/useful is have zig zag ability for these types of projects? The straight stitch only version saves a bit in cost. Am I likely to need that ability? My domestic can do ZZ.
1) Unless you really, absolutely,
must pack up store the machine after each use (such as when living on a sailboat), the Sailrite Ultrafeed machines are bad value for money. To clarify:
they are good machines and their after-sales support is best in the industry. They just cost quite a bit more than a really good condition used industrial machine. If you don't need to pack them up and you don't want a company who will hold your hand as you learn the machine, a used industrial off Craigslist or Marketplace will save you a ton of money.
2) I
personally only use ZZ stitch in two things: Stretchy bits on clothes and sail repair. For the stretchy bits on clothes, honestly a basic domestic with ZZ will do better than an Ultrafeed. For sail repair, an Ultrafeed will do a good job but I'd much rather have a full-sized industrial machine with more harp space. And it'd be cheaper.
YMMV