Need Advice on how to Machine a Part

[ddickey]

The part is 1.250" x 2.000" x 8.00".
This part is going to be attached to a 1.75" round piece via two 1/4-20screws.
I need to mill a .875" concave radius on one end so it fits nice onto the round piece.
If I had a 1.75" end mill i would feed it straight in or take small downward cuts but I don't have that size.
Not sure how to do this.

 

[ddickey]

Just dawned on me. Use a boring bar.
That would be a good way, correct?
The material is aluminum so it should not be difficult to cut.

 

[markba633csi]

Yes boring bar or small flycutter
Mark

 

[benmychree]

Depends what machinery you have to do the job.

 

[fitterman1]

Vertically mill it with a boring head, you'll have lots of control. Fine cuts to prevent a chatter situation.

 

[ddickey]

Yeah, got it done guys, thanks.

 

[Technical Ted]

I've found that fly cutters work well for this. They are pretty short and stout and won't bounce around as much as a small diameter boring bar (unless you have a short, fat boring bar). Either way will work fine though...

Ted

 

[turnitupper]

1-3/4" rota broach or hole saw.
John.

 

[Eddyde]

Here is one I did a while back for with a fly cutter and a HSS tool.

 

[ddickey]

And Joe Pie just posted this.