I have a number of notches that I want to cut out of 2 x 4's.....

The notch is on the end and is 1 1/2" x 1 1/2".....I can do it with a hand saw, but that would take forever.....

Is there a way that I can saw it both ways so that I am left with a notch of the exact size needed.....I have tried experimenting with the distance to saw into the wood, but for some reason I can't get it right....

I know there must be a way, I tried google, no luch there, did a search here and nothing specific here either.....

Would appreciate youre help....

Thanks