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[Nimrod Webber]

My hands are itching… here is my next project.

I have started thinking about this while building the Stand Tricks.
See some details here: http://billfitzmaurice.com/phpBB2/viewtopic.php?t=4378&h ighlight=stand+trick
 
After using them for a while I have come up with some insights and finally completed the design.

This is my take for a tilting adaptor (for a speaker on a stick) that keeps the COG of the cab over the pole's center
at any tilt angle within its tilting range (-12˚… 0˚ … +12˚).

I limited the tilting angle to 12˚ as my experience with the Stand Tricks never encountered a need for more then about 8˚.
The design is true for a cab heaving its COG at about 300mm from the bottom, as this is the average of the cabs I am using.
(and of coarse the cab's top hat being in line with the cab's COG).

The principle and geometry design of the BT is complete.
Only some minor mechanical issues to decide and will start fabricating.



Any insights are welcome…

[Arjan van Gog]

I've also been doing some thinking on this, triggered by some recent posts here. I came up with the following:



It's just a quick rough sketch of the concept. The idea is that you can measure the balance by checking the clearance between the small bumps on the two horizontal plates and that you can balance it by shifting the upper plate. When the bumps touch, there is too much imbalance.

The springs are there to make it easier to obtain an 'almost balanced' situation, otherwise the slightest imbalance would cause the bumps to touch.

An alternative to the touching bumps approach would be an actual balancing arrow pointing down from the upper plate which should point straight down in a balanced situation.

The horizontal shifting could  be done either simply moving the speaker and upper plate by hand, or you could add a threaded axis that could be turned for easy and precise adjustment of the horizontal offset.

I have drawn rollerbearings between the two plates but if you include the threaded shifting axis they may not be necessary if the friction between the two plates is low enough. In fact that would have the advantage of the horizontal shift position being secured automatically, the only way to change it is to turn the axis and that's not gonna happen spontaneously.

The angle is fixed in this drawing but obviously you can use an adjustable mechanism instead. This idea is only about obtaining balance with any speaker regardless of its geometry and center of gravity, and how to check that balance.

So what do you think?

[Chris Gruber]

Nimrod Webber wrote on Wed, 22 October 2008 01:27

My hands are itching… here is my next project. I have started thinking about this while building the Stand Tricks. See some details here:  http://billfitzmaurice.com/phpBB2/viewtopic.php?t=4378&h ighlight=stand+trick   After using them for a while I have come up with some insights and finally completed the design. This is my take for a tilting adaptor (for a speaker on a stick) that keeps the COG of the cab over the pole's center at any tilt angle within its tilting range (-12˚… 0˚ … +12˚). I limited the tilting angle to 12˚ as my experience with the Stand Tricks never encountered a need for more then about 8˚. The design is true for a cab heaving its COG at about 300mm from the bottom, as this is the average of the cabs I am using. (and of coarse the cab's top hat being in line with the cab's COG). The principle and geometry design of the BT is complete. Only some minor mechanical issues to decide and will start fabricating. Any insights are welcome…

I think your idea is great and would love to see a working version. I am always a bit nervous about just tipping them forward and throwing off the balance.

[Jeff Babcock]

Good stuff Mr Webber.  If you eventually are ready to sell production versions please let me know.

[Tim McCulloch]

Hi Nimrod-

That looks very interesting and relatively simple.  I don't see any immediate issues.

Let us know as you progress with this.

Have fun, good luck.

Tim Mc

[Dick Rees]

Gentlemen.....

I applaud your efforts and thoughts on design.  I cannot offer a drawing but I would suggest this:

Rather than an adjustable angle device with several parts, could you not focus the efforts more on the cabinet rather than the stand.  A fixed angle adaptor (say 8-10 degrees or whatever seems the best average) would allow stronger, welded connections of the parts.  To adapt cabinets with slightly differing COG you could simply make the horizontal bar (connecting the female stand mount and the male speaker mount) a slider or at least provide a series of holes 1" or so on center to allow you to move thing as needed and secure it with a locking pin.  Not very elegant, but stronger, I think, if you can live with a fixed angle.

DR
St Paul


PS

Once you establish the proper length of the bar for your cabs you would of course want to use lock nuts.
 

[Charlie Zureki]

Nimrod Webber wrote on Wed, 22 October 2008 01:27

My hands are itching… here is my next project. I have started thinking about this while building the Stand Tricks. See some details here:  http://billfitzmaurice.com/phpBB2/viewtopic.php?t=4378&h ighlight=stand+trick   After using them for a while I have come up with some insights and finally completed the design. This is my take for a tilting adaptor (for a speaker on a stick) that keeps the COG of the cab over the pole's center at any tilt angle within its tilting range (-12˚… 0˚ … +12˚). I limited the tilting angle to 12˚ as my experience with the Stand Tricks never encountered a need for more then about 8˚. The design is true for a cab heaving its COG at about 300mm from the bottom, as this is the average of the cabs I am using. (and of coarse the cab's top hat being in line with the cab's COG). The principle and geometry design of the BT is complete. Only some minor mechanical issues to decide and will start fabricating. Any insights are welcome…

Hello,

   Very nice, and relatively simple design. You have a product, now get to the manufacturing.  I'll take four in Flat Black. (No DJ bling for me)

Seriously, I need four.  

Thank You.

Hammer

[Timothy Allan Jones]

I'll bite...

Does the GOG change because of magnet wt.?

I envision the cab becoming rearward heavy as the forward tilt increases. At max height extension, a stand could be vulnerable to tipping back.

tj

[Charlie Zureki]

Timothy Allan Jones wrote on Wed, 22 October 2008 10:48

I'll bite... Does the GOG change because of magnet wt.? I envision the cab becoming rearward heavy as the forward tilt increases. At max height extension, a stand could be vulnerable to tipping back. tj

 Timothy, what is GOG?
 I'm sure you mean center-of-gravity?
 

 Hammer

[Stephen Payne]

I like the concept. You better hope Uli dosen't!