Angle cut

M

Maplehead

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Good morning All

I want to take a .5” by .5” by 3” long bar and cut one long side so that it has two sides at 120 degrees. This is so I can then cover the angled sides in high grit sandpaper and sand a 120 degree groove. (I’ve searched for an existing 120 degree file to no avail.)
I imagine I would afix the bar in my vice but it would lay on some complementary angled piece, (60 degrees?), and then cut one angled side at a time.
If this is the simplest approach, how would I do this? Those angle blocks don’t look like the right pproach, but maybe they are?
 
I wonder if you could use adhesive to glue two 60 degree files together. That might not make a clean angle at the bottom of your groove but if that is not needed, maybe it would work.
 
Reddinr said:
I wonder if you could use adhesive to glue two 60 degree files together. That might not make a clean angle at the bottom of your groove but if that is not needed, maybe it would work.
Click to expand...
Interesting. However, for me the most important part of the angles is where they meet. I need that sharp.
 
At 3" long, you could angle the milling head 30º and simply cut both sides of the bar; leaving you with a 120º angle and a fairly sharp edge.

On the other hand, if you can do the above, you probably don't need to make a tool and use sandpaper, you can mill the end product directly.
 
Mitch Alsup has the easiest answer my $0.02 would be to hold it securely, perhaps 2 bolts through a holding plate into blind holes in your bar. The plate would be clamped to your mill table.
Ray
 
At 1/2 X 1/2 X 3" long for a sanding block I think I would just drop the table on the disc sander 30degrees and dust off two corners on the working edge until they meet in the middle. Even in steel it wouldn't take but a minute. In aluminum, even faster.
If you're using cold rolled bar, be prepared for a bit of spring when the one side comes off. Might make it a bit banana-shaped.

-frank
 
Mitch Alsup said:
At 3" long, you could angle the milling head 30º and simply cut both sides of the bar; leaving you with a 120º angle and a fairly sharp edge.

On the other hand, if you can do the above, you probably don't need to make a tool and use sandpaper, you can mill the end product directly.
Click to expand...
Fixed mill column.
 
francist said:
At 1/2 X 1/2 X 3" long for a sanding block I think I would just drop the table on the disc sander 30degrees and dust off two corners on the working edge until they meet in the middle. Even in steel it wouldn't take but a minute. In aluminum, even faster.
If you're using cold rolled bar, be prepared for a bit of spring when the one side comes off. Might make it a bit banana-shaped.

-frank
Click to expand...
Hi Frank, I don’t get what you’re meaning but it does sound like my most doable option. Can you clarify for this novice?
 
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