To get a consistent 1/4" seam, I start with an index card on which I use a ruler to measure in a 1/4" line down the long side. Then I place my needle right in the middle of this line with the 1/4" inch marked edge of the card to the right of the needle. Then I use the edge of the card to line Up a strip of blue painters tape on the bed of the machine as a fabric guide line. I also bought a metal "T" bar guide that screws onto the bed of my Juki as a fabric guide..lastly I use a 1/4" presser foot with a guide. It is a "belt and suspenders" approach, but I need all the help I can get! I keep that index card handy to recheck the alignment of everything periodically too.