Can I replace only the needles on the needle plate of my Bernina 1300 MDC or do I need to buy a new needle plate? Thank you.

SOURCE: bernina 1300 dc overlocker skipping stitches

Make sure the chain stitch thread is threaded exactly as it should be, make doubly sure the thread comes off the bobbin vertically and runs through all eyes smoothly. Any faults in the threading causes extra tension at the needle despite what the tension is set on.
If this is not the cause then the needle depth and the looper timing needs checking.
Rob

SOURCE: Bernina deco noise

See if drive belt is not running against the plastic body on right side.!

Hassy

• 1388 Answers
• Posted on Nov 22, 2008

SOURCE: Janome Needle plate and needles hitting something underneath

The broken pins are called chaining pins and are tricky for the home user to replace without risking damage to the needle plate as they are difficult to remove and the tiny burr used to hold them firm can easily open up and no longer grip the pin.
There are only a couple of things under the needleplate that are likely to collide with the needles. 1. Lower looper - with the needles 2. Both Loopers colliding with each other - not with the needles 3. Needle guards attached to lower looper - with the needles 4. Fixed Needle guard - with the needles
If you remove the needleplate and VERY gently turn the handwheel you should be able to see and feel where the collision is occuring and have a better idea of the issue.
I would strongly advise that you do not try to operate the machine until you are sure that the colliding components are adjusted. Broken loopers are approx $65 AUD and guards, tho' only about $20 AUD require some finesse in adjustment. Chain Pins approx $6 AUD
My recommendation is to speak with your local Janome dealer for advice and an approximate price to repair, replace or adjust as the case may be.
Your country's Janome website is certain to have a Dealer Locator page to list the nearest to you.
This is one occasion where it is sensible to call on the people who do these things routinely rather than try to DIY and make a more expensive hash of it.
www.bargainbox.com.au

SOURCE: bernina 2500DCET serger keeps breaking the centre

I have found with any serger I have used that you have to cut the looper (bottom) threads before re threading the needle threads. You then rethread the loopers.
If you don't do this, the needle threads keep breaking. Hope this helps.

SOURCE: needle hits needle plate with heavy fabric

that is your problem, your needle bar is centered too far to the back. There are 2 little bolts (Below the presser foot lift on the back of the machine) that must be loosened while the needle bar is repositioned aligning the needle bar assembly.