Hi everybody !
I think to add a grandmother to my setup but I’m lacking place. Here is my setup right now
I would like to put the GM on the right side of my desk next to the AR. I thought about using a K&M 28075
But I would prefer something without a foot.
Then I saw this laptop stand (up to 17" and 10kg) and monitor stand
But maybe it will be a bit wobbly I don’t know.
Well, If you have any ideas even if it’s DIY, you’re welcome 
Thanks
Road cases always work! Or anything with wheels so you can move it out of the way. I’ve even used a regular keyboard stand with a guitar case across the top. EDIT: I think you might be looking for something a little more elegant though…
Thank you, but you’re right. I’m looking for something as “elegant”, discrète and sturdy as possible
Monitor arms are designed for a fairly static weight that doesn’t move ever. Balanced and sprung premium arms like Ergotron will probably be more satisfying than a budget arm for synth use.
Hanging 16 lbs off a cantilevered arm is a lot to ask from cheap office hardware.
I have a heavy duty music stand similar to that K&M. The Analog Keys or Jupiter Xm are both fairly comfortable on it, though are lighter than the GM. A foot or pedestal gives you a lot of stability.
I found a sturdy Ergotron monitor arm with good specs but now I will need something to put the Grandmother on.
Any idea ?
Thanks
Ok, seems I found a system with :
The bar handle up to 40kg. It should be ok !
That is not how physics works.
As far as I can tell, you are planning on mounting a 105cm (~1M) bar to a single point at the desk. You expect to cantilever a 7.3kg synth with this setup.
F = m * A
F = 7.3 kg * 9.8 m/s^2
F = 71.54 N
Assume that the center of mass of the GM will lie exactly half way along the bar:
Torque = 71.54 N * (1.05 m / 2) = 37 Nm
Now lets move to 1 CM from the bracket:
Torque = 37 Nm = X N * 0.1 m = 370 N
370 N = m * 9.8 m/s^2
m @ 1cm = 37 Kg
If my statics math is correct (and it may not be!), then with the GM placed in the middle of the bar you will be very close to the breaking strength of the bar. If you slide the GM away from the desk or start to play the keyboard, odds of failure are good.
The brackets you have selected are intended to support a load directly perpendicular (90 degrees) to the bar. It is almost certainly not designed for a rotational load. I don’t know what the brackets’ breaking strength is, so they may or may not fail before the bars.
Also: using a round friction clamp to fix a heavy synth to a round bar will likely end in a broken foot, broken Moog or both.
If you are skeptical of this math, hold a large book close to your body for 30 seconds. Then hold the same book as far from your body as you can reach for 30 seconds. Ideally over a bed or couch so you don’t drop the book on your toes.
This would definitely be my preferred approach: hoping for the best.
This looks a little on the thinky side, what with all the numbers and stuff.
Theres a phrase here in Yorkshire: should be reet.
Until of course its not.
Thanks for the reply and the explanations
There will be 2 points under the desk to mount the bar. I will let 55 cm if it for the Grandmother and 50cm under the desk.
Edit : When you talk about brackets, you mean the synth holders ? Jaspers guarantee them up to 15kg each
I just understood what you meant by one point and yes you’re right, maybe it is not safe enough.
Maybe I should use a thicker stainless steel bar instead of the Jaspers 
I was referring to the silver/aluminum metal brackets. If those can only handle 15kg and you are splitting a 37kg load between the two, then they will fail.
If they have greater capacity then your next point of failure is the fasteners. Were you planning on using wood screws to attach those brackets to your desk, or drill through and use bolts?
TL;DR: I think this project is marginal. Odds are good that you will damage your synth, self or desk. Just buy the stand with the column. That will definitely work and definitely be safe.
Ok. They are heavy duty stainless steel brackets. They can handle more charge than the Grandmother and the bar with holders.
I think wood screws won’t be strong enough. The wood of my desk is 36mm thick. Bolts will be better.
The problem with the K&M stand is the foot which will hinder me to move. This is why I’m struggling to find another solution 
To avoid confusion, here are some diagrams.
I assume this is roughly your intent:
This is a simplified side view to better understand the physics of moment arms and torque
A better solution would include a brace. But a brace adds complexity and cost and may not be practically much different than a pillar.
The big problem is that this is all Statics analysis. Statics is nice because the math is easy. The problem is that the world is not static, and a synth stand is most certainly not static. So there will be dynamic loads that are difficult to compute. The engineering solution to these problems is either (1) spend lots of money on deeper analysis (2) use a safety factor of 2-5 (2x for your Moog Grandmother, 5x if you were building a bench for your actual human Grandmother).
Hopefully we have at least one actual Civil Engineer here who can confirm my analysis or inform us that I’m full of 
.
Hi,
Finally, I gave up my project 
The Grandmother will be on my desk (right side) in front of my laptop on its new arm.
The K&M 28075 stand seems to be a very good option but as I said, the foot base is too large for my space.
Thanks for your help 
Hey !
After a couple of weeks, this setup did not convince me and I finally choose the K&M 28075.
It fits perfectly on my left. It is sturdy, discrete and stable. What else !
So, I’m good now 
Looks great! I am still looking for a stand for my GM, can you tell me please the width of the foot? It looks quite big on the photos at webshops but I cannot find how wide it is exactly and want to be sure it fits.
Cheers!
Hi,
Foot width is 64cm
Thanks!
