After extrusion a white plane appair

[schriffert_balazs]

Hi!

So I got a problem where I made a spiral and I need to cut off a sertain amount of it. After I make a extrution or a split, a white plane appair and I can't remove it. It can be seen before the extrusion too. If I go to flat pattern, nothing there and the part seems removed. 

How can I make it disappear? 

Thank you for the help! 

[James_Willo]

Please post an image of what you see.

[schriffert_balazs]

[James_Willo]

There are no planes in that image, which bit are you referring to and what did it look like before the split?

Thanks

[schriffert_balazs]

Before

After 

After

In the assembly 

It looks like its "see through" 

[James_Willo]

I think maybe there are 3 faces here not 2. So I think you are splitting the outer faces and removing them and the inside one is being left. You may be able to confirm this by using the section view to see inside the part before splitting. 

[schriffert_balazs]

The section view is clean and there is no third face or anything like that. 

[James_Willo]

Sorry, I meant to try this. 
Are you able to upload the file for me to look at?

[schriffert_balazs]

Sorry, I thought I did upload it 

[James_Willo]

 This loft is the surface you are seeing. 

You can right click and turn off the visibility of it

[schriffert_balazs]

Thank you very much!
Haven't seen that yet!

[James_Willo]

I would normally use a plane to split something like that. You can also use the trim command to remove the surface you dont want. 

[CCarreiras]

Hi!

I would do the opposite, first cut the surface, then add the thickness.
That way, you will have a flat pattern with lateral normal faces (no chamfer due the cut).

 

This:

Instead of:

[schriffert_balazs]

Thank you very much! Great advice! 

[CCarreiras]

... and you "solve" the extra surface "issue"... but... anyway, you should turn the visibility off for the loft surface as @James_Willo suggested. It done the job, so, you can manually turn it invisible, like happens to the sketches (but in this case, automatically)

[James_Willo]

By the way, the reason you didn't see it in the drawing is because by default surfaces are turned off in views.