I am making a handicap ramp and want to use 2x4s for posts and 1 1/2 pipe for handrail. I would like to round out the top of the 2x4 for the rail to fit into. What is the easiest way to do this?[/QUOTE
2manyrocks has your partial answer. Buy the length of 2x4 that when cut in half and bury or attach, gives you the correct handrail height. You should drill your hole right in the middle of your cut line before the post is cut of course. The only difference is I would suggest an auger bit. Barring that, you could V-notch the rail posts with a hand saw for the rails to nestle into. The rails themselves will hide the notch. Don't forget to angle the corners of the 2x4 toward the rail so you have a continuous hand clasp around the railing without the post interrupting the grip.