Main > Project Announcements
Project A-kab = FINISHED!
csa3d:
--- Quote from: Zobeid on April 10, 2008, 05:26:34 am ---
--- Quote from: csa3d on April 09, 2008, 11:33:02 pm ---I'm curious how you're going to center the rectangle inside the circle now that it's cut out all ready.
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Not sure why this would be difficult? Just mark "crosshairs" through the center of the circle and use them to center the monitor, then trace its outline.
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Zobeid, not trying to sound like a tool for asking, I just couldn't think of a way to do it once I left the comfort of a square before the cut. With a square piece of wood, finding direct center was a sinch by drawing two diagonals from corner to corner. Then using a compass and a ruler, it wasn't so bad marking the rectangle to be perfectly centered in that circle. On top of that, I had 4 perfectly strait edges to cross check any measurements to ensure dead center.
So you drew the crosshairs before cutting the circle? If so, then I can see how you might work it out.
If not, how can you guarantee dead center? You also have a hole drilled out of the center now due to routing, right? So you can't even depend on an mark being dead center on the wood circle.. you'll have to eyeball that location, and all other marks on the wood would be off by that imprecision. Perhaps I am being too concerned about exacting math on that part. Eyeballing the monitor cutout to me, was not going to be good enough to ensure that during rotation, everything was properly centered.
-csa
EDIT: Guess it is possible after all.. Center of a circle after cut
Cornchip:
Damn, that's some snake. Harmless I hope.
Cornchip.
Zobeid:
--- Quote from: csa3d on April 10, 2008, 07:17:20 am ---Zobeid, not trying to sound like a tool for asking, I just couldn't think of a way to do it once I left the comfort of a square before the cut. With a square piece of wood, finding direct center was a sinch by drawing two diagonals from corner to corner.
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Ahh, now I get it. . . mostly. . .
The center of the circle is the 1/4" hole that I used as a pivot point for my improvised compass when I drew the circle outline to begin with, and then used again for the circle-cutting router jig. Now it's my turn to wonder: How did you manage to draw and cut circles without a hole in the center?
For what it's worth. . . If I had to find the center of a blank circle, I'd try using two arcs. I'd use a compass with a radius greater than that of the circle. Using the edge of the circle I'd draw an arc across it, then go to roughly the opposite point and draw a second arc. The arcs should intersect at two points. A line drawn through those two points will bisect the circle. Then turn everything roughly 90 degrees and repeat the process, and you have a pair of lines crossing at the center of the circle.
csa3d:
--- Quote from: Zobeid on April 10, 2008, 08:33:34 am ---Now it's my turn to wonder: How did you manage to draw and cut circles without a hole in the center?
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I drew everything first, including the rectangle cutout, then drilled my center hole, routed out the circle, and finally jigged out the interior monitor frame. I think I'm up to speed now.. and I think I'm now armed with the info I would need should I ever repeat this process again.
-csa
Zobeid:
Got the speaker panel installed. . . I did the cutouts for the Klipsch speakers before putting the panel in. Also made a blank control panel. It's starting to look like a cabinet.
Also put together the whole "rotavator" assembly. . .
Not sure how I'm going to support that thing inside the cabinet while I position and secure it. It needs to be placed at a rather awkward angle.