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Re: Boomilever B/C
Posted: October 12th, 2019, 8:48 am
by LoneMonkey
Since the compression beams will have to be "diagonal", how will the loading block fit on top of this? I'm new to Boomilever, but it seems that in the past, people made the outside edges of their compression pieces exactly 5cm and put their tension pieces around that.
Would making it in one diagonal and one straight part, then gluing them together work? (Similar to towers in '18). Or would that break too easily?
Re: Boomilever B/C
Posted: October 13th, 2019, 12:39 pm
by sciolyperson1
LoneMonkey wrote: ↑October 12th, 2019, 8:48 am
Since the compression beams will have to be "diagonal", how will the loading block fit on top of this? I'm new to Boomilever, but it seems that in the past, people made the outside edges of their compression pieces exactly 5cm and put their tension pieces around that.
Would making it in one diagonal and one straight part, then gluing them together work? (Similar to towers in '18). Or would that break too easily?
It wouldn't break to easily as long as the connection is built correctly, make sure to gusset the connection and add an extra horizontal bracing or two as well.
Re: Boomilever B/C
Posted: October 15th, 2019, 7:50 pm
by Lorant
So what is the deal with Euler's Critical Load? Can it be used as a valid prediction for the deflection pattern of a horizontal compression member. I am specifically referring to the modes of buckling of a column shown here
https://upload.wikimedia.org/wikipedia/ ... Length.png
Even more specifically, the second column from the left.
Re: Boomilever B/C
Posted: October 16th, 2019, 10:15 am
by bernard
Several
diagrams for Boomilever have been posted to the national website.
Re: Boomilever B/C
Posted: October 18th, 2019, 10:50 am
by scioly2345
Anyone have any suggestions when it comes to cross piece sizes?
Since the breaks of my recent boomis where just compression, I’m thinking of going from square 1/16 to possibly 1/8 by 1/16 or 3/16 by 1/16 cross pieces in the compression piece.
I don’t really know why my compression pieces have been breaking, I don’t know if I haven’t been putting enough glue on each joint or if the size of the cross pieces is the problem, but I’m gonna going up in size for the compression cross pieces first and seeing how that works.
Re: Boomilever B/C
Posted: October 19th, 2019, 7:23 am
by Lorant
scioly2345 wrote: ↑October 18th, 2019, 10:50 am
Anyone have any suggestions when it comes to cross piece sizes?
Since the breaks of my recent boomis where just compression, I’m thinking of going from square 1/16 to possibly 1/8 by 1/16 or 3/16 by 1/16 cross pieces in the compression piece.
I don’t really know why my compression pieces have been breaking, I don’t know if I haven’t been putting enough glue on each joint or if the size of the cross pieces is the problem, but I’m gonna going up in size for the compression cross pieces first and seeing how that works.
In my experience, fairly dense, square 1/16 is the best for base cross pieces, no exceptions. If anything, you may want to look into the density and grain of your cross pieces, or their arrangement.
Re: Boomilever B/C
Posted: October 19th, 2019, 3:39 pm
by 123445
Any tips for the base. Since with 8cm width requirement the base that I used to use won't be viable anymore since I was using just a small piece of bass then laminating it. ( Used narrow booms last year )
Re: Boomilever B/C
Posted: October 19th, 2019, 6:43 pm
by MadCow2357
123445 wrote: ↑October 19th, 2019, 3:39 pm
Any tips for the base. Since with 8cm width requirement the base that I used to use won't be viable anymore since I was using just a small piece of bass then laminating it. ( Used narrow booms last year )
Generally the base doesn't touch the wall so I don't think you'll have a problem? Maybe I'm reading the rules wrong but that's my interpretation anyway.
Re: Boomilever B/C
Posted: October 19th, 2019, 7:10 pm
by BigBootyBason
MadCow2357 wrote: ↑October 19th, 2019, 6:43 pm
123445 wrote: ↑October 19th, 2019, 3:39 pm
Any tips for the base. Since with 8cm width requirement the base that I used to use won't be viable anymore since I was using just a small piece of bass then laminating it. ( Used narrow booms last year )
Generally the base doesn't touch the wall so I don't think you'll have a problem? Maybe I'm reading the rules wrong but that's my interpretation anyway.
I think he's saying his boom last year were a lot narrower compared to this year. And since this year's booms are gonna be wider he isn't sure how to account that for the base bc his base was also narrow.
Re: Boomilever B/C
Posted: October 20th, 2019, 4:06 pm
by LoneMonkey
sciolyperson1 wrote: ↑October 13th, 2019, 12:39 pm
LoneMonkey wrote: ↑October 12th, 2019, 8:48 am
Since the compression beams will have to be "diagonal", how will the loading block fit on top of this? I'm new to Boomilever, but it seems that in the past, people made the outside edges of their compression pieces exactly 5cm and put their tension pieces around that.
Would making it in one diagonal and one straight part, then gluing them together work? (Similar to towers in '18). Or would that break too easily?
It wouldn't break to easily as long as the connection is built correctly, make sure to gusset the connection and add an extra horizontal bracing or two as well.
So then would this be the best option for boomis this year? Or is there a way to make the loading block fit on "diagonal" compression pieces?
