the real question here is....
Are these slits AT the end or are they in FROM the end? Because the pipe wants to close in one itself if the end is free, but that's less likely if the slits are made back from the end a few inches.
To accurately make 3 slots at 120 degrees apart or 4 slots at 90 degrees apart will require a jig of some sort or an indexing plug on the end with marks.
A small plunge router with a 3/16" bit which rides on a carriage with no side to side play will do it safely and accurately. The jig and set up will take an hour or two to make and the cut will take a minute or two....
a guide bushing in a slot will make it accurate or capture the router's base plate between 2 wooden tracks for guides.
the other bill
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
Last edited by woodnthings; 06-10-2012 at 10:11 PM.