making a fly cutter need help!!

[knifer-one]

I am making a fly cutter and am wondering about the angle of the cutter holder. Is there a best angle to make it ? Most I have seen look to be around 15-20 degrees. This will be a1.5 inch diameter unit using 3/8 square cutter. Thanks

 

[DMS]

I think mine was about 10deg. It's not critical, just enough so it doesn't rub the edge.

 

[Bill Gruby]

The angle on all three of my commercial ones is 20 degrees.

"Billy G"

 

[David Kirtley]

Anything that gets the cutter down below the body of the fly cutter.

 

[Kevin45]

Anything that gets the cutter down below the body of the fly cutter.

Tip it at anywhere from 10 to 30 degrees. But you want the face of the toolbit on centerline and not have the toolbit centerline on the flycutter centerline. Or to put it in simpler terms, shift your cut centerline by .187. Just make sure you move it in the right dimension seeing that you will be looking at it upside down in the vise.

 

[GK1918]

Tip it at anywhere from 10 to 30 degrees. But you want the face of the toolbit on centerline and not have the toolbit centerline on the flycutter centerline. Or to put it in simpler terms, shift your cut centerline by .187. Just make sure you move it in the right dimension seeing that you will be looking at it upside down in the vise.

OR, when I made my set I scribed the center line on the holder then scribed the tool bit to that line,
drilled & tapped, allens, done on the shaper, I think the angle is around 15* I eyeballed it works fine.

 

[PurpLev]

I did mine with an angle of about 10 degrees and find that it requires for a very unique grind on the HSS cutters I'm using since the fly cutter holder angle is this shallow - if I was to make another one (which I probably will) I would go with 20 degrees which would make the grind on the cutter more standard, and also be able to use commercially available cutters (think carbide brazed for example).

that said - the angle isn't critical otherwise as long as you match up the grinding on the cutter to it.

 

[llarson]

I've made several over the years, school, work, and home. 15 deg. has always worked well. One thing to think about if making a shallow angle one, is trapping chips under the head, especially w/aluminum where a pretty good size chip can be cut.