Building A Boomilever

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UQOnyx
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Re: Building A Boomilever

Post by UQOnyx » December 28th, 2012, 12:42 pm

Okay. btw, how do I cut the triangles :oops: ? Whenever I cut bass with an x-acto knife, it always breaks or cut at a bad angle. Should I use bass sheets with this or just the 1/8 x 1/8 stick?
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Re: Building A Boomilever

Post by Balsa Man » December 28th, 2012, 1:17 pm

Yes, do back and read, as iwonder suggested. For the plate, for stiffness, so it doesn't bend/break at the bolt, you want thick, light balsa, with laminated, thin "skin"- at least on the away from wall side- recomend 1/64th on both the toward the wall and the away from the wall sides. The thickness (recommend 1/2 inch) also gives you the glue area needed, and space/distance for the triangular wedges Aia describes/shows.
These wedges should be out of the same material as the tension members- if you're using 3/32nds bass, which is more than enough, then the wedges shoulb also be from that. A good, sharp single-edge razor blade works fine. Angle of the cut is not all that critical- a good tight fit is
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Re: Building A Boomilever

Post by UQOnyx » December 28th, 2012, 1:31 pm

YES. Thank you, that completely answers the question. I wasn't sure if the triangles were there as wedges, or for correction :D
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Re: Building A Boomilever

Post by Balsa Man » December 28th, 2012, 1:44 pm

UQOnyx wrote:YES. Thank you, that completely answers the question. I wasn't sure if the triangles were there as wedges, or for correction :D
Cool. The way Aia's using them, they act as wedges
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Re: Building A Boomilever

Post by UQOnyx » December 28th, 2012, 2:27 pm

One more thing: What wood sheets should I buy for the base? I'm going to get them right now so I need them quick :)
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Re: Building A Boomilever

Post by juicemanman » December 28th, 2012, 3:26 pm

I used balsa. It's cheap and not very dense.
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Re: Building A Boomilever

Post by Balsa Man » December 28th, 2012, 3:50 pm

UQOnyx wrote:One more thing: What wood sheets should I buy for the base? I'm going to get them right now so I need them quick :)
Recommendation- a piece of balsa 1" x 1"; most places you can get in 12 or 24" long- you want the very lightest of what they have Cut 1/2" off one end- with a saw, so the sides (where you cut, and the original end are nice and parallel). That gives you a nice end-grain block, 1 x 1 x 1/2 thick. Bolt hole goes in the 1 x 1 face(s). Now for "skin" layers, what you really want is 1/64th inch sheet- high density balsa (like 10 or 11 grams for a 3" x 36" sheet. Unlikely your hobby store will have. An alternative - Ace Hardware usually has- 1/64th birch plywood. Because its manufactured, your balsa needs to be just a bit less than 1/2" thick.
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Re: Building A Boomilever

Post by iwonder » December 28th, 2012, 5:50 pm

You've mentioned this birch plywood a few times... I haven't seen any, but does it really have two plys to it? That's pretty scary stuff...
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Re: Building A Boomilever

Post by UQOnyx » December 28th, 2012, 6:42 pm

Whew, Finished the whole boomilever. I just finished making the base. :D Looks pretty good!
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Re: Building A Boomilever

Post by Balsa Man » December 28th, 2012, 6:46 pm

iwonder wrote:You've mentioned this birch plywood a few times... I haven't seen any, but does it really have two plys to it? That's pretty scary stuff...
Two or three- haven't deconstructed a piece to tell. A little heavier than 1/64th hi density balsa, but not a lot, but more easily obtained (Hobbytown and Ace Hardware- at least around here)
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