Rolled hem settings

3-thread rolled hem:

Remove left needle.
Settings as follows:
Upper looper 3-5
Lower looper 7-9
Right needle 3-5
Stitch length 1-1.5
Cutting width 3-5
Differential N

If you scroll down to "Serger," and download Workbook 1, there are instructions in there for setting up a rolled hem.

Bernina Mastery Workbooks

Your machine differs but the way it functions is very similar--at least the settings should be helpful.

Be sure you have the proper foot for your machine to make a rolled hem.

Bernette 203 How to use rolled hem foot have the one page manual but it...

Sew Inspired Serger Rolled Hem Tips

In case you don't have a manual, you may be able to glean some information here:
Sergers Overlockers
need manual for the Bernina Bernette 203 overlocker

...

by rolled hem I imagine that you are trying to put something like rope in the hem to make a round edge
You can buy a 1/2 foot that allows the needle to get close to what ever is making the roll
see your local sewing machine shop

you don't mention if the machine is a sewing machine or serger, or the name or model number?

If you want it done entirely by machine you will need a special attachment. You'd have to check the make and model of your machine to find out if there is an attachment available from the maker. If not, there are some companies that make general attachments, and they'll list what machines these will fit. Check online sewing supply houses for this kind of thing.

You can also make one by hand. Any decent sewing book would tell you how. Usually you sew a straight stitch along the hem, using quite small stitches. Trim hem to a quarter inch from the stitch line. Crease the fabric or press it along the stitch line to the inside. Anchor your hand thread, then take a short stitch right along the stitch line. Next catch one thread of the fabric a quarter inch above the stitch line. It's just a basic running stitch, back and forth. Every few stitches, gently snug up the thread, which will roll the hem over. The finer the fabric, the smaller the stitches you take where they'll show should be.

There are some images that will help, if you enter the following search terms in google, you will see several pictures. Type the words," Illustrations for how to make a rolled hem by hand ? " and you will get a load of ideas.

http://content.janome.com/userfiles/file/inst%20book%20634D.pdf

Change the needle plate setting knob to rolled hem, starting on p. 28

try this solution
http://www.fixya.com/support/t9307094-cannot_get_tension_right_also_trying

not exactly your serger model but technique will be very similar for rolled hem.

You need to set up a three thread overlock with the right hand needle, (take left needle out), and change the thread finger in the throat. Sometimes a switch to do this and sometimes it is a little piece on the foot that you change with a screwdriver.

Also, this solution http://www.fixya.com/support/t9280656-thread_janome_204d_serger is basic threading on 204D, it should be very similar to your model.

I have looked for a free download instruction manual for your machine without success. But you should be able to buy one from Janome or another of the online sewing sites like www.sewusa.com or www.sewingpartsonline.com.

]ve a manual you can somtimes find them on the Janome websit
Here is a link to threading up for 334D
http://www.sewusa.com/Threading_Diagrams/Threading_Pages/New_Home_Threading_Diagrams/New_home_334_MyLock_Threading_Diagram.htm

go to this link and i think your manual is the first one on the page.
Janome Mylock 234D overlocker Google Search

i dont have a baby lock but on my machine i change from rolled hem to flat needle plate
or change setting to n from r also loosen lower looper tension as rolled hem requires a tight lower looper tension.
hope this helps you
mary h