Onebyone,
When I'm sewing a quarter inch seam on my PC420 I use the J foot. Using the J foot, you can then move your needle over to either the 5.5 or the 6 position and get a very nice quarter inch seam using the right edge of the foot as your guide. I test each time I start a project to see which position will give me the best seam with the type of fabric and thread I'm using. Usually it's the 5.5, but sometimes, if I'm using a thicker thread I'll move it to the 6 position.
I tried using the quarter inch foot manufactured by Brother, but because this machine is a 7mm machine, the feed dogs are a little too far apart to work well with the quarter inch foot for my liking.
Let me know how the Janome feet work for you. You'll still want to move the needle to the right--just use the plus/minus keys on the front of the machine and start with the needle in the default position. There is a way you can save the setting, so if you use the same weight fabric and thread for all your piecing, then you can set it up and then save the setting. I've never done that since I use so many different fabrics and threads for piecing, but check your user's manual. I think it's under custom stitch or something like that.
Speaking of the manual. I was amazed at the size of the manual that comes with it, it's like a sewing course book.
enjoy your new toy!
Rob
Last edited by rryder; 02-13-2016 at 11:43 AM.
Reason: clarification