Tips for my tower please

soccerkid812
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Re: Tips for my tower please

Post by soccerkid812 » January 21st, 2011, 5:38 pm

robotman09 wrote:yea just diagonals not horizontals and your diagonals would be flush with the one below them
are you saying it is better to take out the horizontal pieces on the chimney?

yousef213
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Re: Tips for my tower please

Post by yousef213 » January 21st, 2011, 5:39 pm

robotman09 wrote:yea just diagonals not horizontals and your diagonals would be flush with the one below them
ty any other tips?

I was thinking of making my base look somewhat like this

.. _....
_I_ I_
I_I_I_I
..I_I

where there would be 2 rectangles, each 4.5" x mabey 20"

So that I dont "waste weight" on the corners, and so the force has to travel less to get to the testing base.

Does anyone think that would be better?
Gt(xbl): Gonthorian II

" In 2012 the world will truely end, for 1/2 the world will die from heart palpitations induced by panic attack, and the other half will laugh so hard they will have irregular breathing and die."
- By yousef213

SLM
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Re: Tips for my tower please

Post by SLM » January 22nd, 2011, 5:46 am

yousef213 wrote: - How doI reduce weight? (without completly changing my design)
-How do I increase strenth? (without completly changing my design)
Have you tested the tower? If so, are you satisfied with the amount of load it can hold? Based on the information that I could extract from the picture, I am failing to see how the tower can hold much load.

yousef213
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Re: Tips for my tower please

Post by yousef213 » January 22nd, 2011, 7:35 am

SLM wrote:
yousef213 wrote: - How doI reduce weight? (without completly changing my design)
-How do I increase strenth? (without completly changing my design)
Have you tested the tower? If so, are you satisfied with the amount of load it can hold? Based on the information that I could extract from the picture, I am failing to see how the tower can hold much load.
As I said it supported 13.8 kg and weighed 29.5g. So, what I am focusing on is reducing weight because it held a decent amount
Gt(xbl): Gonthorian II

" In 2012 the world will truely end, for 1/2 the world will die from heart palpitations induced by panic attack, and the other half will laugh so hard they will have irregular breathing and die."
- By yousef213

SLM
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Re: Tips for my tower please

Post by SLM » January 22nd, 2011, 8:20 am

yousef213 wrote:
As I said it supported 13.8 kg and weighed 29.5g. So, what I am focusing on is reducing weight because it held a decent amount
Was the tower tested at a tournament using a standard testing platform (with a 20 cm x 20 cm opening)? Or, did you test it using a platform with a smaller opening?

My concern with the tower is its supports. Where were the points of contact between the tower and the platform you tested it on? Just the four outer corners of the square base?

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Re: Tips for my tower please

Post by yousef213 » January 22nd, 2011, 9:08 am

SLM wrote:
yousef213 wrote:
As I said it supported 13.8 kg and weighed 29.5g. So, what I am focusing on is reducing weight because it held a decent amount
Was the tower tested at a tournament using a standard testing platform (with a 20 cm x 20 cm opening)? Or, did you test it using a platform with a smaller opening?

My concern with the tower is its supports. Where were the points of contact between the tower and the platform you tested it on? Just the four outer corners of the square base?
Yes, so what I am considering doing is making the base instead 2 21 cm x 4.5 cm rectangles connected in the xenter to make my frid. Thus it would have more support than just the corners. My concern is if it yould be to heavy. What do you think?
Gt(xbl): Gonthorian II

" In 2012 the world will truely end, for 1/2 the world will die from heart palpitations induced by panic attack, and the other half will laugh so hard they will have irregular breathing and die."
- By yousef213

SLM
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Re: Tips for my tower please

Post by SLM » January 22nd, 2011, 12:32 pm

yousef213 wrote: ... Thus it would have more support than just the corners. My concern is if it yould be to heavy. What do you think?
The primary problem with the tower is its supports. To see why, let’s separate the vertical part (core) of the tower from the square base, and examine the base more closely. The applied load transfers to the base through the core as shown below.

Image

So, if I draw a diagram of the base only, it is going to look something like this:

Image

Here, the blue lines represent the existing members, the red arrows represent the forces that are applied to the base from the core, and the green triangles represent the supports (points of contact between the base and the testing platform ). The problem here is that there are no vertical (or close-to-vertical) members carrying the red forces to the green supports. The base consists entirely of horizontal members. Given the small size (3/32 x 3/32) of these members, they would have a very difficult time withstanding the loads and effectively transferring them to the support points.

Here is a suggestion for remedying the problem.

1. Have inclined members directly transferring the load from the core to the supports, as shown below.
Image

2. Brace the inclined members to prevent instability (buckling), as shown below.
Image

3. Eliminate most of the members in the lower part of the tower, except for the horizontal bracings at the base, as shown below.
Image

The revised design should result in a stronger, and probably lighter tower.

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Re: Tips for my tower please

Post by yousef213 » January 22nd, 2011, 12:53 pm

I dont think I follow with step #3. Are you suggesting I remove the core there completely or just stop bracing it under a certain point?

Btw thankyou for your other tips & diagram
Gt(xbl): Gonthorian II

" In 2012 the world will truely end, for 1/2 the world will die from heart palpitations induced by panic attack, and the other half will laugh so hard they will have irregular breathing and die."
- By yousef213

soccerkid812
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Re: Tips for my tower please

Post by soccerkid812 » January 22nd, 2011, 12:55 pm

hes saying only keep the top 3 parts on the horizontal chimney and the red legs that he drew in.

SLM
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Re: Tips for my tower please

Post by SLM » January 22nd, 2011, 12:58 pm

soccerkid812 wrote:hes saying only keep the top 3 parts on the horizontal chimney and the red legs that he drew in.
Exactly!

You can remove the lower part of the core completely without adversely affecting the ability of the tower to carry the load. The lower part of the core carries very little load and really has no functional use.

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