embroidery is based on the ruler and tape measure system. really its insane! haha im kidding
no actually embroidery works on proximity. not every piece will be in the same place, because not every shirt is sewn the same way. the difference will be unnoticeable by eye or so unnoticeable that a customer will not notice. heres how it works. well this is how i do it.
i mark my shirt. so lets say its a large, i sew out the sample for my shirt, and stick it on where it should go. if you want ill send you placement charts. once the shirt is marked i set up my hooping board which i will send you the link for in a second. than i hoop that size.
and it goes on for each size. as the sizes get smaller i decrease the logo a little bit in size. you do not want a 6 inch logo on a xs ladies shirt. but on a men's 2xl it will work.
its not a perfect science, it will never be in the same place, just like the machine will never sew the same way everytime. its a machine. On that note.
www.hoopmaster.com
purchase this system and you will have no problems.
or the all in one hooper. or make the hooper i made one works like a charm!