Concave-Radius End Mill

[CrossSlide]

I've never used a Radius End Mill before. I'm milling a 1/16th" radius. Do I have to mill a 1/8" bar or will this end mill be able to cut a 1/4th" shown in the last drawing?

 

[mzayd3]

The radius is half the diameter. To get a full semi-circle profile, which is what I assume you are after, you need 1/8" stock to have no filets or steps.

I notice you said like the third pic. If you use a 1/16" radius cutter centered on 1/4" stock you will end with the bottom profile with 1/16" filets on the top and bottom.

 

[RandyM]

I've never used a Radius End Mill before. I'm milling a 1/16th" radius. Do I have to mill a 1/8" bar or will this end mill be able to cut a 1/4th" shown in the last drawing?

The real question is, what is it you want it to look like? Picture 2 or 3?

 

[jamie76x]

If you want the part to look like the last picture I would knock the bulk of the material off with an end mill. A cutter like that does not have an negative clearance on the outside dia of the cutter and will either ruin it or make your part look terrible.

 

[TOOLMASTER]

sounds like you are trying to do a single radius with a beading bit

 

[mzayd3]

Jamie-
Are you saying that the only intended cutting edges are the concave radius of the cutter? I don't quite understand what you are saying.


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[CrossSlide]

My end part will be "A". Should I mill my surfaces then blend in with the radius or would it be better to do "B" radius first and then surface mill to the radius?

 

[mzayd3]

"B" seems like a lot of waste to get to "A"


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[Flammable_Solid]

My end part will be "A". Should I mill my surfaces then blend in with the radius or would it be better to do "B" radius first and then surface mill to the radius?

View attachment 78610

Depends on how you have to hold your workpiece. Getting the radius cutter centered is paramount to ending up with drawing A.

 

[JimDawson]

This would be my choice for doing that operation

Corner rounding end mill


Or in aluminum, radius cutting wood router bit or shaper bit.