Machining Outside Round Corner - Manual Mill

Phil: It's not a dumb question- one of those shapes that can be done several ways
M
 
I used to just round corners on a belt or disc sander before I got a set of corner rounding endmills.
Although sometimes it's still quicker to just use a belt or disc sander I use the corner rounding endmills whenever I can.

Corner rounding endmill followed by a chamferring machine.
20190215_132935.jpg20190215_140021.jpg
 
Outside corner radii like that are regularly done on a stationary belt/disc sander to a line scribed using a radius gauge.
 
Phil3 said:
.... My only concern is that my vise is small and standing the workpiece vertically, will leave quite a bit of material unsupported. .....
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Why do you have to stand it vertically? A corner rounding end mill won't care if the piece is standing on its end or laying on its side.

Tom
 
higgite said:
Why do you have to stand it vertically? A corner rounding end mill won't care if the piece is standing on its end or laying on its side.

Tom
Click to expand...

Wait, what? For a corner rounding endmill the workpiece has to be standing vertically. If laying flat it will only round the edges & not the 4 corners of a square or rectangle. Unless I'm missing something & there are some other type of corner rounding endmills different than what I have?
 
I just installed a cheap DRO on my mill. It has the capability of doing radii in any of 3 planes. I haven't tried it yet but it appears to generate coordinate pairs so you can step around the radius.

It is also possible by using a rotary table. 4 radii, 4 setups. A real pain in the rear.

The Volstro rotary milling attachment for BP mills would do it.
 
darkzero said:
Wait, what? For a corner rounding endmill the workpiece has to be standing vertically. If laying flat it will only round the edges & not the 4 corners of a square or rectangle. Unless I'm missing something & there are some other type of corner rounding endmills different than what I have?
Click to expand...
Semantics. I was talking about laying it on its side, or edge if you prefer, as opposed to standing it on end, which I took Phil to mean when he said he was concerned about standing the work piece vertically. I didn't mean laying it face up. Maybe I should have said laying it on its long edge as opposed to standing it on its short edge. The pic you posted after my post is pretty much the orientation that I meant. Sorry for the confusion.

Tom
 
There are times when I find "landscape" and "portrait" to be much more useful terms than I ever thought they would be.

-f
 
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