Hi, My Stihl TS400 with 14"

DO NOT USE SAW!!!

1. switch off saw, remove cord from socket (positive electrical insulation)
2. lift table for maximum cut and check size of the washer holding the blade,
3. you should have holding nut with collar, collar is about 1 1/4 (32mm) diameter, then blade (diamond is actually universal reducing bush in some blades) and lastly you should have internal washer, again, about 1 1/4" (32mm) diameter. if your collar are smaller, you need to replace blade as not suitable for your particular model, albeit I am rather suspicious that you have wrong collared nut and internal collar. Please check if both collars are exactly this same diameter. Please check if collars cover diamond cut-out.
4. if you see discreptancy between description in 3, purchase suitable blade (external diameter is 7 1/4" (184mm), as you did not supply what model of your saw, therefore most probably shank is 5/8" (16mm),
5. mount internal bush (collar), will go correctly only in one way.
6. mount blade (pay attention to cut direction, cutting surface should be clockwise if you look at mounting shaft.
7. mount external flared nut
8. check blade for slippage and wobbliness
9. connect power cord and switch on/off
10. check saw blade againg for slippage/wobbliness
11. make test cut if 10 was correct
12. use normally

Do not forget that this is not a toy, it will cut through wood, ocassional nail and your fingers.

Opearating saw crate flying debris, always wear googles or facemask, you have only two eyes and there is no spares.

Please leave note how you go with this advice.

Check blade is on properly. Remove blade and clean area where mounts to shaft. Make sure proper washers are in place. If blade is bent or wobbles replace. If blade is dull replace. Be sure you're getting enough water to saw. Don't force the tile through, let the saw do the work. Nothing helps any kind of saw more than a nice new blade.

You are going to cut a double bowl vanity top in half and use the 2 sinks? Do you have enough room on each side for the tops to be at least 24" with the bowl in the middle? You need a diamond saw, water cooled, a skilsaw will work with a diamond blade and somebody hold a hose on it while it is cutting, it would be better to find somebody, a granite top maker with a bridge saw to cut it for you, nice and straight. Then polish the cut edges that show. That stone you have is a pretty tough stuff, you can polish it easier than granite, and it cuts easier, but you still need the diamond, I wouldn't use a dry blade or a carborundum blade. Hope this helps.

Check the blade centre bolt for corrct tightness. If you have fitted a new blade, check to see if it is the type with a removable centre spacer (multi fit type) if it is, it sounds like the centre bolt has bee overtightened at some stage and deformed the spacer which now takes all the drive from the motor instead of the blade itself. Try giving the spacer a light file to remove any burrs. If all else fails, obtain a new blade which doesn't have the center spacer to avoid this problem

Unplug the saw, raise the guard fully, grasp the blade to hold it and loosen the nut then remove the blade.

Sometimes a blade that is set deep enough will walk in this manner, especially if it is a thin kerf blade like the MK Hotdog blade.

Also, a blade which has worn unevenly will do this too.

Do you have the securing nut on the correct way? Basically the inner surface of the nut needs to be flat against the blade for it to work correctly and hold the cutting disc in place Usually the nuts are reversible to fit either flat discs or rounded disc heads. It's either that or you do not have the right size bore on the diamond disc for your grinder.

You've answered this yourself. The blade only needs to be nipped up enough to grip. If it slips, it will tighten. Thats why, some machines have a left hand thread, as they always rotate so as to tighten in the event of slippage.
If the blade slips under normal service, suggest you clean both blade and the flanges, and just do it up a little tighter next time.

I have a stihl ms 180 that leaks bar oil all the time

options, change the blade, buy a more expensive blade, make sure the blade turns true when running, if not the armeture might bent inside the saw.