Why does my circular saw shaft spin and blade does not?
Why does my circular saw shaft spin and blade does not?


Because you loosened the nut or bolt holding the blade to the shaft.


  it stalled so [I] loosened the bolt a little


It would probably be more appropriate to  ...


sharpen the blade or 
cut more slowly or
make sure the kerf isn't closing onto the blade due to ...


poorly supported workpiece
stresses in wood