What is wrong when my sewing machine don't straight stitch even tho my settings are correct?

If your Huskystar 207 sewing machine is stuck on zigzag stitch even when you have selected a straight stitch pattern, there are a few things you can try to troubleshoot the issue:

1. Check the needle position: Make sure that the needle is in the center position. If it is not, you may need to adjust it using the machine's settings.
2. Check the stitch length and width: Make sure that the stitch length and width are set to the appropriate settings for a straight stitch. Refer to your manual for the correct settings.
3. Check the tension: If the tension is too loose or too tight, it can cause the machine to sew a zigzag stitch instead of a straight stitch. Make sure the tension is set correctly for the fabric you are working with.
4. Clean the machine: Sometimes, a buildup of dust and lint can cause the machine to malfunction. Try cleaning the machine, particularly the bobbin case and feed dogs, to see if this resolves the issue.

If none of these steps resolve the issue, you may need to take your machine to a professional for repair.

not sure if this will help you out..if you scroll to the bottom of this page on the left you will see Previous Lessons:
lesson 1: Welcome and intro first,
lesson 2: Guide to Buying a Sewing Machine
lesson 3: Sewing Machine Supplies
lesson 4: Getting to Know Your Machine
lesson 5: How to Thread Your Machine
lesson 6: How to Sew a Straight, curved, and corner line
lesson 7: How to Sew a Basic Seam
Lesson 8: Trouble Shooting Your Sewing Machine
Lesson 9: Basic Sewing Terms

Next Lessons:
Lesson 11: How to Read a Pattern Envelope....
Sewing Lesson 10 How to Fix Tension on Your Sewing Machine ..try this link.

Is your bobbin threaded correctly? You should be able to pull out the thread slowly while feeling it very slightly holding back. It should not pull out easily or quickly.
Could be something wrong with your tensions, try adjusting the upper tension first by starting at the middle setting and working gradually higher and then lower till you get a neat even stitch.

YES. ALL SEWING MACHINES DO STRAIGHT STITCH. EVEN IF YOU WOULD SET THE STITCH SELECTOR TO A ZIGZAG YOU COULD STILL SEW STRAIGHT STITCH BY SETTING THE WIDTH TO ZERO. OTHERWISE YOU COULD JUST USE THE STRAIGHT STITCH CHOICE.

Adjust the tension

Maybe there's a problem with your straight stitch needle plate .Try looking at it. Read Sewing machine reviews.

it sounds like the machine needs to be checked at a sewing
machine shop to see what's wrong with the cam's or gear
that makes the stitches

Why don't you download the manual which will tell you everything you need to know? get it here. http://sewingonline.co.uk/library/JONES-VX-950.html

You can download the manual for your machine from the Brother site, link is
http://welcome.solutions.brother.com/BSC/public/files/dlf/doch000061/xr52c65txl64526562ug01enesfr.pdf

There are lots of weights of silk fabric but I'll assume you are working with something soft and silky like a silk charmeusse or silk georgette.

You need to stitch seams with a straight stitch and use a new sharp needle size 70 or even 60. Change the needle every 4-6 sewing hours or if you hear squeaking or popping; throw away the blunt one.

Use a quality polyester thread like Guttermann, Mettler, or Metryosene. Start with stitch length on 2.5 and stitch width zero (straight stitch). The normal metal presser foot is probably best for this. If the fabric is see through you may wish to do french seams to encase the raw edges. This is where you sew wrong sides together, then turn and stitch right sides together, if you have never done this instructions are here http://sewing.about.com/od/techniques/ss/frenchseam.htm.

Also pay carefull attention to your bobbin winding, my tip for this is here
http://www.fixya.com/support/r10598580-winding_bobbin_correctly
as winding the bobbin smoothly and evenly is essential to quality stitched seams.

Always press every seam as you sew, dry iron, silk setting. Press each side of the seam, then press the seam allowances open, this sets the stitches into the fabric.

If you find that the seam is pulling up you can try loosing off the top tension by a half number (turn it down to loosen) and shorten up the stitch length a fraction to 2.2 or so. But you don't want it too small as if you need to "unsew" ie unpick, you'll never see the thread.

Use a lighweight interfacing if the pattern requires it; I'd use a fusible but very lightweight such as Pellon Featherweight.

Happy sewing.

First, make sure you select the straight stitch setting on the round dial. It is the one that has the dashed lines, looking like the stitch itself. Then, you may also want to be sure that the stitch WIDTH (dial with the picture that looks like a straight line gradually turning into a zig-zag) to the lowest setting, which is generally 0. With some machines, even after selecting a straight stitch setting, moving the stitch width can change needle position. Sometimes it will initiate the zig zag, other times it will move needle position left to right. Does that fix it?