In article ,
Robatoy wrote:
...snipped...
If set up properly, the cam action will impede the movement backwards.


Maybe if the curved part of the guard had teeth cut into it like
a table saw anti-kickback pawl, but don't count on the typical jointer
guard to keep a board from moving. Just try letting go of a short board
during a deep cut and see what happens!


--
Often wrong, never in doubt.

Larry Wasserman - Baltimore Maryland - lwasserm(a)sdf. lonestar. org