building kitchen vent hood, questions

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Old 01-27-07, 05:02 AM
J
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building kitchen vent hood, questions

I am attempting to build my own vent hood for over an island cooktop. My plan is to use 3/4" maple plywood for the outside and line the inside in either aluminum or stainless steel. There will be a 4-5" air gap between the wood and the metal. My problem is trying to figure out the angles. The hood is going to slope on all 4 sides. I would like it to come out 8" on each side, and I am unsure what miter to cut along the side to give me a mitered corner, so the plywood edges don't show?

.......__________|<8">|
...../.................\
.../.....................\ <- what angle to I set the circular saw at to
./________________\ cut this side?


Any help would be greatly appreciated.

Thanks,
Jordan
 
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Old 01-27-07, 05:52 AM
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Your plywood would have 45 degree bevels to create a mitered corner. The angle of the parts does not change that, because when you look down on the trapezoid, it looks like a rectangle.
 
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Old 01-27-07, 07:09 AM
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Hood

I must respectfully disagree with XSleeper.

We need to know the vertical distance corresponding to the 8" horozontal distance.

We have to figure out the angle that will be formed between two adjacent sides. It will be greater than 90 degrees but less than 180 degrees.
 
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Old 01-27-07, 01:56 PM
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The bevel will be a 45 degree angle, but it becomes a compound miter with the increase in size from top to bottom. A rectangle is a rectangle, and you will encompass 360 degrees all the way around, so 8 each 45 degree miters will equal the 360 degrees.
 
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Old 01-27-07, 02:30 PM
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Wirepuller38 got me to wondering... so after changing the oil in my truck this afternoon, I made a little mockup to see if I was confused. The pieces were cut on a 15 degree miter, with a 45 degree bevel.

If you'd like to see the pics, they are at:

http://pg.photos.yahoo.com/ph/thexsleeper/detail?.dir=/cbbare2&.dnm=b79dre2.jpg

I see now, Wirepuller38, that you must have been imagining that the hood was returning to the wall at an angle (greater than 90 degrees), which would indeed mean that the bevel would not be 45. However, that isn't the way kitchen vent hoods are designed. They return to the wall at 90 degree angles.
 
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Old 01-27-07, 03:33 PM
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Hood

The hood is for an island. I was thinking all four sides would be angled outward. The poster is trying to figure out the angle to set the saw to make the bevel cuts to connect the four corners. 45 degrees will only work for rectangular shape where the sides are at right angles to the top and bottom. This is not the case here. The angle will be less than 45 but greater than zero. The bottom of each side will be 8 inches farther out at the bottom than at the top. How deep is the hood? Or, how wide are the boards being used to make the sides?

I may be completely off base, but this is how I visualize the situation.

Help!
 
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Old 01-27-07, 08:29 PM
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Unless the top of the hood is shaped like a hexagon or octagon, the sides will all be comprised of 45 degree bevels, as my mockup shows.
 
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Old 01-28-07, 03:36 AM
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Thank you so much.

I was having trouble visuallizing it, but now I see it needs to be 45 degrees.

Thanks,
Jordan
 
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Old 01-28-07, 11:16 AM
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Hood

Let us know how it turns out. Good luck with your project.
 
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