I have a Grace Next Generation frame. I just checked the instruction booklet and it doesn't say whether you could use it with an 18" machine, but I doubt it. I am using a Pfaff with a 9" throat and after about a year, I wish I had gone with something larger. While the frame will take a quilt up to 110" wide, that small throat area means that with a big quilt (and that includes full size - pretty much anything larger than a baby or lap quilt) the rolled quilt gets too big and you don't have any room left to sew. I have to quilt halfway down the length, then take it off the frame, turn it around, reload the quilt and roll it to where I stopped, then finish the quilting. With a twin size, I can load it sideways and not have to turn it. It's still better than trying to quilt a large quilt on a regular machine without the frame, but it makes me wish I'd really done my homework before I bought it.