Rex 26-188 what size needle does it take? 16 X 63???

Maybe a hardware store.

This is an industrial machine, so there is not a lot of help on it. Check out the link. I did find a manual for $10.

https://www.google.com/search?q=Rex+model+345-2L+needle+systems

..

Could ask manufacturer. :-)

You can check with http://www.shop.heavysew.com/Rex_c109.htm if you don't find it on there site call them Heavy Sew com Online Shop

This will depend on using the proper needle and thread on this commercial machine.
Cheers,
Embroidery Services
San Diego, CA

16x63 needle system, unless it's been retimed for something else. Suggest you might want to find the dull, bent up or otherwise still intact needle and show it to your industrial supplier or repair person, so they can check for you.
Needle system tells you about the length and timing distance of the needle: see, e.g.: http://designer-entrepreneurs.com/blog/illustrations/Singer_Needle.pdf Size tells you about the diameter of the needle: here's a suite of home sewing machine needles, all of the same needle system, but one of the photos shows a comparison of sizes:
http://www.picturetrail.com/sfx/album/view/17206792

here are some link, contact them and ask them
http://www.sewman.com/rex-sewing-machines.html

http://www.sewingmachineoutlet.com/rextn.htm

http://www.allbrands.com/categories/735

Well, start by changing the needle. It is very likely to be worn.. and causing you a problem. Also take a look to see where the shuttle point ends up in relation to the needle when the needle is at it's lowest point.

The shuttle point should be just right behind and above the eye of the needle. If it is not... call a repair guy or your dealer for timing help.

retime your hook with relation to your needle the hook is slightly out of time causing it to "slip the loop" the hook should hold the loop until the needle retracts forming the chain

Hi There, I am just new here and just got a new REX hemming machine. I am not too sure if your issue was resolved but just make sure the six little holes on the machine are oiled each time you use the machine.. make sure all screws are tightened and make sure the motor itself is not loose, this was an issue with my new machine and why it would not run, since REX has no support I had to troubleshoot myself.