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Adjust the tension the same way as sewing regular projects. You want the top and bobbin threads to meet in the middle of the quilt sandwich. When quilting, I use a lighter weight thread so I have a separate bobbin case whose tension has been tightened specifically for quilting. For other sewing projects using a standard thread weight, I use a bobbin case that is factory set and then adjust the top thread tension for each project.
There is usually a mark on the tension dial that indicates the default setting--generally, it is at the midway point between high & low numbers. However, the correct tension is dependent on the fabric, thread, and needle you are using. Some stitches require a different tension setting, ie free motion quilting, as well as lighter weight vs heavier weight fabrics will require some adjustments.
The factory standard tension setting is the midway point between high & low number on the tension dial. Of course, every machine is different so it may need to be tweaked. The tension is correct when the upper and bobbin threads meet in the middle of the fabric.
Factory standard tension for upper thread is the midway point between the high and low number. However, that tension dial is meant to be used for tweaking tension. Generally, tweaking is required whenever the type of fabric, needle, or thread are changed, ie thicker fabric like denim should have a different upper tension setting than fine chiffon. To be successful with tension settings, one must become comfortable adjusting the upper tension.
Probably your owner's manual is the best source for information. The tension dial usually has a selection of numbers from 0 to 10 (or something similar). Zero is the loosest and the highest number is the tightest. The factory standard setting is somewhere around the midpoint, however, your machine's setting may not be exact.
Be sure that you RAISE the presser foot BEFORE threading the upper thread so the tension disks allow the thread to seat properly.
The ideal tension is when the upper thread and bobbin thread meet in the middle of the fabric being stitched. The tension will probably need to change when you change thread and fabric. You should become comfortable with adjusting the upper tension as it is a integral part of achieving sewing success.
According to the manual, you should not need to adjust the bobbin tension (and I located other sites which stated the bobbin tension cannot be adjusted on this machine). Apparently, all the tension adjustment is accomplished through the upper thread::
"EN Thread Tension Upper thread tension Basic thread tension setting: "4". (1) To increase the tension, turn the dial to the next number up. To reduce the tension, turn the dial to the next number down. A. Normal thread tension for straight stitch sewing. B. Thread tension too loose for straight stitch sewing. Turn dial to higher number. C. Thread tension too tight for straight stitch sewing. Turn dial to lower number. D. Normal thread tension for zig zag and decorative sewing. Correct thread tension is when a small amount of the upper thread appears on the bottom side of fabric. Lower thread tension The bobbin tension has been set correctly at the factory, so you do not need to adjust it. Please note: - Proper tension setting is important for strong seams. - There is no single tension setting appropriate for all stitch functions, thread or fabric. - A balanced tension (identical stitches both top and bottom) is usually only desirable for straight stitch construction sewing. - 90% of all sewing will be between "3" and "5". - For zig zag and decorative sewing stitch functions, thread tension should generally be less than for straight stitch sewing. - For all decorative sewing you will always obtain a nicer stitch and less fabric puckering when the upper thread appears on the bottom side of your fabric. 1 A B C 22 D"
Doing further research, I found this statement on a machine review site:
"After reading reviews online from where I've bought my drop-in bobbin machines, I think many of the negative reviews are due to the bobbin thread coming up without laying across the bobbin. It can cause the stitches to look very sloppy and no amount of tension adjusting can fix the stitches."
There are several machine review sites wherein 4423 owners stated their disappointment in the 4423's performance. Some said the machine failed almost immediately and others said the machines developed problems when sewing heavy fabric.