I am having a problem with the automatic thread cut on the DDL-8500. It will sometimes cut the end of the needle off when used. It does not happen everytime. Sometimes the cutter will jam behind the needle when it is in the lowest position and bend the needle.

Check out the videos. It is adjustable

I am confused as to why one place on this says Juki cp-160 and one says DDL-8500-7
If it is the DDL, my most common problem with my knives that cut the threads have become jammed after I either broke a needle or had a thread 'nest' underneath from something I did wrong, like not getting my bobbin case in good before I started to sew.
1. Remove your throat plate (the silver or black plate that covers your feed dog teeth, may sometimes have lines on it to allow you to measure your seam allowance as you sew) that is held on with two screws.
2. Use a bright light to look into your machine under the plate and see if you see broken needle parts or a thread nest. If so, remove them with tweezers or a small pair of needle nose pliers. If you solved the problem, you will hear a small click as the blades return to their proper places.
...Then you can simply reinstall your cover plate and begin sewing.
If the above didn't work:
Your cutting system is made up of two pieces. A moving knife that looks like a tiny silver bird the size of a dime and a stationary knife that looks like the letter L backwards. If either is broken, you should have a repairman fix it. If you have had your machine and sewed alot you may also just have dull knives but I would imagine that they are either jammed or broken.
Good Luck.

Is it making a noise when you try to cut? Most common is that your needle plate is bent down and is preventing your knives from doing their job. In this case, you can take the plate off, turn it over on a flat surface and use a hammer to flatten it. While the plate is off, test your machine and see if the blades are now moving. Make sure to keep your fingers away while you are doing this. :)
Now check to make sure your feed dogs are not cracked or broken and keeping the blades from moving. Next: Sometimes you either get a ball of thread or a piece of a broken needle caught in the blades as they try to cut and it can either bend the stationary knife (this knife is in the general shape of a backwards letter L) or break it off. If all the knife pieces are there, the small moving knife (that looks like a little flat fat bird with a big eye :) ) becomes dull and won't cut the thread when it moves against the stationary knife. In either case, you can replace the knife. The most common is to replace the stationary knife. It is the easiest to replace and can be ordered online with the part # from your parts book. If you don't have a parts book, try to contact your online sewing parts company for the part.

Is this a new machine or have you had the problem before

Skipped stitches
1. The needle is not inserted correctly
Remove needle & reinsert needle( flat side towards the back of machine)
2. The needle is damaged
replace with new needle
3. The wrong size needle is being used
Choose a needle to suit the thread & fabric
4. The foot not attached correctly
Check & attach correctly

YOU MAY SEE THREAD HANDLER HAVE SOME PROBLEM. THERE MAY BE SOME THREAD TON IN IT

there's a tension dial with numbers-0-9 --above the needle area- the smaller the number the looser the tension--the higher the number the tighter the tension

thread breaking-try this
try rethreading the machine
thread tension to tight
needle is bent or blunt
needle is inserted incorrectly
the thread is either too heavy or too fine for the needle

try this & see if it helps you
Cut 6-8 inch piece of thread of the spool you are going to use for your project
Take the needle you are going to use for the project
& insert the thread thru the eye of the needle
& lift one end of the thread to a 45 degree angle
& if the needle is the right size for the thread it will slide down the thread
But if the needle hangs on the thread you need one size larger needle for the thread

hi there
can u check one by one
1 - loose screw for needle bar clamp and turn the wheel by hand.
2 - from down remove the finger for hook and turn machine pully maybe some thread insaid the finger.
3- loose the four screws for upper main shaft and turn the machine pully by hand.
best regards
ashraf abozid
[email protected]

Go to the website freemanuals.com They may have yours

The DDL 8500. is a high quality, single needle, straight stitch, industrial machine. If it is still in a good condition and the present owner is prepared to guarantee it for at least 3 months, it is a good buy. Retail for app. $790.00 new.

Good luck