Some machines are easier than others to sew a perfect 1/4" seam. I have a Pfaff, Bernina, Brother and Baby Lock. I really think it has to do with the feed dogs, to some degree.
Do you mind telling us what machine you are using?
I have found with my Baby Lock and Brother, I can get a more uniform, even, and consistent 1/4". I use a standard (J) foot, and set the needle to the 5.5 position for a scant 1/4", and 6.0 for a full 1/4". I have found that I sew much better on these machines.
I think using a full foot, and the feed dogs really do help. But this is only my opinion.
Hope this helps.
Last edited by Girlfriend; 12-16-2014 at 09:50 AM.