How to drill this hole?

[southern_guy]

I am making an electric guitar for my son. I need to drill a hole for the jack, similar to the one shown here.
[attachthumb=#]

Essentially it is a 16mm hole drilled at an acute angle into the face of the guitar body. The 16mm hole only goes to just below the surface of the body. From there the hole reduces to 12mm. The 12mm hole is easy, I have a 12mm brad point bit that will take care of that. The larger hole is the one I want to make sure I do correctly, as it is not just functional, but cosmetic as well.

I have experimented with the following process on scrap, and believe it will work if I get the right bit to drill the hole:

1) Take a piece of say 2x1, and cut the end of that piece at the angle of the jack hole.
2) Drill a vertical hole into the edge of the piece, very close to the end, using the 16mm bit. I stopped drilling the moment the hole started to appear in the angled cut.
3) I then cut the end of the block of wood of, hole and all, with a cut parallel to the first.
4) this left me with a block I could clamp to the surface of the test piece, with a guide hole at the correct angle.
5) I then drilled into the guide block, through the edge and into the test piece.

This is what the block looked like, after a test run (albeit not to full depth).
[attachthumb=#]

The only bit I had of the correct size was a spade bit. This produced the desired effect, but the quality of the cut wasn't acceptable. I am thinking I need a forstner bit or something similar. Will such a bit work in an electric hand drill?

Can anyone suggest a better method?

 

[chrisrosenb]

You are correct.
A forstner bit would be the correct bit for that job.

 

[Sparktrician]

Concur with Chris.  Forstner bits are designed to make precise and clean holes, and work well in electric drills and drill presses.  

[smile]

 

[tDot]

Sounds like you've got good advice so far. The only comment that I'd add is that to build the drill jig, first drill square through the wood that you're using for the jig, then make you're angled cut. No ugly tear out!! Then take that offcut, flip it around and glue it to the back of the jig. Make sure that you end up with a second face that is parallel to the face of the jig the drill bit will exit. There you have an instant clamping pad. Ensure that when you place the clamp that it's closer to the toe of the jig, not clamping at the overhanging portion of the jig

A forstner bit entering the wood at an angle will try to walk across the surface of the wood, so clamp it tight. Personally I'd make the jig wide enough to get two clamps on there.

 

[fdengel]

First thing I thought of when looking at that was that it looked almost like a pocket hole stopped short.