So i want to make a external thread on a cylinder for like 6 hours today and i cannot really find a fix for the problem...There is what i mean 
There is how it looks before Cut-Speep.Right what i want it to look like,but look what it looks like after i apply the Cut-Sweep feature...
Nothing near normal thread.Please if somebody know where is the problem help me.Thanks !
Can you post your part here
Edit:File is uploaded!
Is this what you want
Works fine for me, it looks like in your image you're using Swept Cut, when you should be using Swept Boss/Base, essentially what you're doing is cutting nothing but air.
Out of curiosity, as you're a student, are you being taught to model this way? where you've got an extruded cylinder, then you sketch a cross on the end face, add a plane to the end face, then create the next cylinder on that plane?
If you are I think you should be asking for a refund...
Ohh i am really dumb... Thanks for help that is exactly what i was looking for.And they are not teaching us that way,they want from us to make a Screw Press or something similar to this.And nobody is really teaching us lol,they are just giving the Name of what you must do and give you 1 picture of that,after that you're on your own... THANKS once again <3 <3
I hope you are not paying for that.
They are just giving you a picture and telling you to go figure it out yourself - that's not teaching!
Doing it this way is only going to teach you some really bad habits - and un-learning a bad habit is one of the hardest things to do. Believe me, I know - I used to say quitting smoking is easy - I've done it many times! - but the reality is I only did it one time that counted and that was really, really, REALLY hard.
You would be better off (if you are paying for it) to used one of the professional teaching programs like Solid Professor, Pluralsite, or several others then to be learning from someone having you do it without "Teaching" you PROPERLY. (don't mean to shout - but it is really important).
Works fine for me, it looks like in your image you're using Swept Cut, when you should be using Swept Boss/Base, essentially what you're doing is cutting nothing but air.