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Old 09-19-2012, 12:01 PM   #21 (permalink)
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i would definitely put some diagonal boards on that bottom box. those little corner pieces have a lever arm of a few inches to stop the beams from being torqued. if you put cross beams it has the entire width of the box as the lever arm. put them in both directions. 2 x 4s are dirt cheap. it may seem sturdy now, but after you climb up it a hundred times things start to loosen and weaken. if it were me, i'd put cross members on all three boxes, cause why not.

as others have said, that saw horse better be temporary cause it isn't going to do shit. i'd also be careful about how the very top of the ramp is connected to the top box. i can't see in the picture if you have bolts or what, but if it's just some drywall screws, you might want to add some robustness to it.

craftmanship is excellent though.
i've built all sorts of crap like this, and happen to be a mechanical engineer.
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Old 09-19-2012, 04:44 PM   #22 (permalink)
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Thanks for all the feedback, it is exactly what I need to make it better.

After all of the comments on the stability in the long run of the 3' box I'm going to add some diagonal supports on the bottom to make sure it never moves at all. If it were only me going on the ramp I'd probably say fuck it and just not worry about it (it is really strong, I would feel safe jumping on it repeatedly), but it's not only me going on it. It's going to be friends too and I wold feel terrible if something happened.

To reiterate, the sawhorse is Extremely temporary as in tomorrow I'm making a replacement. my friend had to stabilize it until he took the picture. It is not safe at all.

One of the things I am most proud of is figuring out how to attach the ramp to the platform. It is definitely not just drywall screws.







These pictures are from the top box, and it shows 3 2x4's with 1 1/4" holes through them



This is the top of the ramp with 4 2x4's with holes drilled through them



this is the 1 1/8" dowel that goes through them to lock them together.

I really went for overkill on the strength of this. The pieces connected to the ramp have a minimum of 5 3 1/2" screws. The only thing that could be worse than the ramp collapsing would be the whole tower collapsing.


Really, thanks for all the help guys. Every piece of advice that you guys give me is one less trip to the hospital this winter
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Old 09-19-2012, 04:49 PM   #23 (permalink)
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use metal, like a steel pipe instead of that dowel...
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Old 09-19-2012, 04:55 PM   #24 (permalink)
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That dowel was one of the steps for a ladder, and the distance between the 2x4's is less than and inch. Not something I'm worried about at all
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Old 09-23-2012, 02:24 PM   #25 (permalink)
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Promise, last update.

I implemented most of your suggesting, like adding supports diagonally on the bottom box, and changing the support on the ramp.

FINISHED PICTURES:








Thank you all for your help. It would have been a lot harder without you guys.
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Old 11-13-2012, 06:27 AM   #26 (permalink)
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I finally was able to get some snow and try it out!
http://www.snowboardingforum.com/sno...urned-out.html
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