Do All Sewing Machines Give A "lock Stitch"?

[Tallbald]

Another post I made makes me wonder this. Seems a sewing machine would be quick if it does, but sacrifices the strength of a saddle stitch. Don

[TwinOaks]

No, some sewing machines make a chain stitch. If it's hidden behind a layer or glued down...or held down because the thread is lubed with acrylic wax...it isn't really an issue. Redwing Boots/shoes are built using a chain stitch machine (I think they use a Union....there was a video post here not too long ago).

No machine can replicate the saddle stitch, though, because the thread alternates sides of the leather.

[mogwild]

Says its a "Puritan" machine:

[Northmount]

Flour and sugar sacks that are sewen closed are done with a chain stitch. As a kid, I used to collect the string from them for other projects. If you start on the right end, you can "unzip" the whole thing with one good pull. So like on boots and shoes, the needle/thread has to be sized tight in the leather, and bees wax, etc. to lock it in place. And layers are usually glued, so if the surface thread is damaged, it doesn't fall apart. Like TwinOaks says, no machine does saddle stitch or anything close to it.

CTG