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Re: Towers B/C
Posted: February 2nd, 2018, 11:55 am
by dholdgreve
TowerPro+2500 wrote:dholdgreve wrote:I don't think it is required that it spans the entire opening, but what IS required is that the chain drops to within 2.5 cm of the center of the 20 cm x 20 cm opening in the table top. I can't visualize your design, but I can't imagine how this is possible with a triangle tower that only wraps 2 sides of the opening. On our testing table we have a 20 cm x 20 cm opening cut through the 3/4" thick top. We then took a 1/4" thick piece of plywood and mounted it to the under side of the table across the entire opening cut above. Then we drilled a 5 cm diameter hole directly in the center of the 20 x 20 opening. If your chain doesn't drop through that circle without hanging on the edge of it, it does not pass muster... sorry.
Thanks, I must have missed the rule about within 2.5 cm of the opening. The chain doesn't hang on the edge, but there is no way that it is within 2.5 cm of the opening.
Suggest you read over Rule 3.b once again.
Re: Towers B/C
Posted: February 4th, 2018, 6:01 am
by Cow481
Anyone know if the chimney is under compression or tension or both.
Re: Towers B/C
Posted: February 4th, 2018, 6:14 am
by Balsa Man
Cow481 wrote:Anyone know if the chimney is under compression or tension or both.
Just stop and think about what's going on..... This is really basic.
Load block is sitting on top of the chimney; bucket is pulling down on the load block, so the force created is pushing down on the top of the tower - compressing it. The legs (chimney and base) are under pure compression loading. Brace pieces can/will see both compression and tension loading.
Re: Towers B/C
Posted: February 4th, 2018, 11:04 am
by Cow481
Balsa Man wrote:Cow481 wrote:Anyone know if the chimney is under compression or tension or both.
Just stop and think about what's going on..... This is really basic.
Load block is sitting on top of the chimney; bucket is pulling down on the load block, so the force created is pushing down on the top of the tower - compressing it. The legs (chimney and base) are under pure compression loading. Brace pieces can/will see both compression and tension loading.
Thanks
Re: Towers B/C
Posted: February 4th, 2018, 11:49 am
by TheSquaad
Not sure if this has been asked already, but is there any benefit to adding a single horizontal brace on each side where the base meets the chimney?
Re: Towers B/C
Posted: February 4th, 2018, 12:11 pm
by TowerPro+2500
I found that a horizontal bracing helps with the compression load as it prevents the the legs for crunching in.
-Hope this helps
Re: Towers B/C
Posted: February 4th, 2018, 1:27 pm
by Balsa Man
TheSquaad wrote:Not sure if this has been asked already, but is there any benefit to adding a single horizontal brace on each side where the base meets the chimney?
This has been asked and answered a number of times.
The tops of the base segments are pushing in toward each other with a force of a bit over 2kg (with a 15kg tower load). Yes, you need ladder pieces (the horizontal braces you refer to) right at the top of the base section to brace against this.
Re: Towers B/C
Posted: February 4th, 2018, 4:29 pm
by LiveMas
I have been thinking about this for a while, but just wanted to hear your thoughts about it.
What if someone mad e a coverall tower, which is basically a tower without any crossections, but rather 1/32 or 1/64 sheets covering all sides of the tower (using lightest density).
Would this work?
Re: Towers B/C
Posted: February 4th, 2018, 4:29 pm
by LiveMas
I am sure it will hold all 15 kgs!
Re: Towers B/C
Posted: February 4th, 2018, 5:57 pm
by Unome
LiveMas wrote:I have been thinking about this for a while, but just wanted to hear your thoughts about it.
What if someone mad e a coverall tower, which is basically a tower without any crossections, but rather 1/32 or 1/64 sheets covering all sides of the tower (using lightest density).
Would this work?
It might work, depending on the thickness. I doubt it would be very competitive, especially since using sheets of wood that small means it's very likely that the sheets have some weak points.