extrude lines and polylines

[MeGuinness]

I have started using AutoCAD for about one week so be gentle with me please

Im creating a Rc car chassis ,I used a combinations of lines and polylines arc's and circle for the screws holes .....

I joined the lines all by converting the lines to polylines and using the JOIN command.

I then switched to 3d for the extrude part....and gave a thickness of 5mm ..

 

My question is how do I get to show as a solid image without all the lines ?

Thanx

[JD Mather]

Looks like a surface body, not a solid body.

Attach your *.dwg file here and end all doubt.

 

Once you get a solid body - the command you are looking for is shademode.

[CC6614]

It appears that your main body isn't a closed loop. You could go back before the extrude and try the region command. If that fails you know you don't have a closed loop. Your holes extruded correctly from what I can tell.

[Cad64]

Extruding lines and polylines creates Surfaces. You should use the Presspull command to create Solids. https://www.google.com/?gws_rd=ssl#q=autocad+presspull

[ReMark]

When extruding lines, arcs and polylines in a closed shape using the PressPull command will result in a solid.