I can't STAND it!!!

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himhimself
Posts: 599
Joined: Fri Nov 13, 2015 9:34 pm
Location: Vancouver BC & Bloomington IN

I can't STAND it!!!

#1 Post by himhimself »

The very first outing after I built my otops, I had planned to put them on my tripod stands. I built the stacking bases and installed pole mounts. However, the creaking/swaying when we set the first pair on the tripod freaked me out and we set them up on a deck instead. Since then, they've set on other less than beautiful "stands" - boxes, coolers, subs... I had an idea for building some stands, but it has taken me a while to get around to it. Two goals: keep the cost down, and make them look respectable. Not quite done yet, but I think I'm going to succeed.
The plywood for the bases and tops was all free, rescued from EU shipping crates that typically get tossed after the payload is unloaded at my work. I picked up a couple "10 foot lighting trusses" from Amazon, I think they were about $50. They are actually two 5 foot sections, 11" width, which was exactly what I wanted. We purchase multiple disposable balances for weighing out hazardous products. Each one comes with a couple pretty stainless 300g weights, but since they aren't NIST traceable, we can't use them. So rather than scrap them, I kept them. Turns out they are the perfect diameter to slide inside the trusses. I was going to just use 1 3/8" dowel sections, but these look so much cooler - at least until the stands are set up. Anyway, had a friend weld them onto electrical box covers through the center KO - dipped them in muratic acid to get rid of the galvanized layer. They are then through bolted to the bases and tops, with fender washers on the backside. To give the bases some weight, they are attached to horse stall mat rubber. I used multiple tubes of construction adhesive on each one (all free after rebate - thanks Menards), then stack them and put a couple hundred pounds of tile on top until it cured. I used a hole saw to core out the rubber where each bolt comes through so I can retighten/remove/change easy in the future. Oh, killer internet tip on cutting the horse stall mats. I was thinking to use a jig saw, but a utility knife works like magic. Google it.
To give lateral rigidity, I picked up 4 $12 aluminum squares (again, free after rebate, thanks Menards!) I made them into rectangles with JBWeld and pop rivets, then epoxied a strip of thin baltic birch to the vertical parts and routed out a 1.5" channel so then nest up tight against the trusses. In the pic, I have clamps holding them right now, since my bolts were a little too long preventing the wing nuts from tightening down all the way. Will get that taken care of this week.
Sprayed the electrical plates, then slapped some cheap black paint on, followed by a quick coat of duratex since it was sunny and relatively warm out today. Duratex is the secret to make any DIY project look legit!
To finish up, I need a way to keep the trusses attached to the bases and tops. Usually you run a pin through the tubes, capturing the mounting studS, but these weights are to hard to drill out. Therefore, I plan to through bolt eyes top and bottom, then connect them with threaded rods with turnbuckles, so I can snug them up. May put them in an x pattern to give more rigidity. We shall see. Next outing in two weeks, so hope to have them all ready to go by then.
Will post some pics in a minute.
2xT30 (20", 3012LF)
2xT30 (21", 3012LF)
4xOtop J-array (Beta12, melded/straight piezos)
Truck Tuba (MCM)
Next up: 2xJack12 or family of table tubas

himhimself
Posts: 599
Joined: Fri Nov 13, 2015 9:34 pm
Location: Vancouver BC & Bloomington IN

Re: I can't STAND it!!!

#2 Post by himhimself »

Some pics
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2xT30 (20", 3012LF)
2xT30 (21", 3012LF)
4xOtop J-array (Beta12, melded/straight piezos)
Truck Tuba (MCM)
Next up: 2xJack12 or family of table tubas

himhimself
Posts: 599
Joined: Fri Nov 13, 2015 9:34 pm
Location: Vancouver BC & Bloomington IN

Re: I can't STAND it!!!

#3 Post by himhimself »

A couple more
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2xT30 (20", 3012LF)
2xT30 (21", 3012LF)
4xOtop J-array (Beta12, melded/straight piezos)
Truck Tuba (MCM)
Next up: 2xJack12 or family of table tubas

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Seth
Posts: 2731
Joined: Thu Sep 10, 2009 8:06 pm
Location: Sacramento, California, USA
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Re: I can't STAND it!!!

#4 Post by Seth »

They look great! Good job.

I remember you posting about the hunting stands. Looks like you have come up with a decent compromise :thumbsup:

Is there any way to make the base "footprint" larger? Just judging by the photos, they look like they should be fairly stable. But, it would be great to be able to add even more tip resistance.

Damn, those do look good!
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded

Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421

himhimself
Posts: 599
Joined: Fri Nov 13, 2015 9:34 pm
Location: Vancouver BC & Bloomington IN

Re: I can't STAND it!!!

#5 Post by himhimself »

Thanks Seth. The bases are 24x32. I'm figuring to plop a big weight in the center to add stability. I'll give an update once I finish up and toss the Otops on them.
2xT30 (20", 3012LF)
2xT30 (21", 3012LF)
4xOtop J-array (Beta12, melded/straight piezos)
Truck Tuba (MCM)
Next up: 2xJack12 or family of table tubas

Bruce Weldy
Posts: 8301
Joined: Fri Nov 27, 2009 11:37 am
Location: New Braunfels, TX

Re: I can't STAND it!!!

#6 Post by Bruce Weldy »

himhimself wrote: Sun Feb 23, 2020 8:31 pm Thanks Seth. The bases are 24x32. I'm figuring to plop a big weight in the center to add stability. I'll give an update once I finish up and toss the Otops on them.
The center isn't going to stop tipping as well as putting the weight front and back, since that's the shorter side it's not as stable. You will probably also find that you are going to have to put feet on it to overcome uneven surfaces. Even floors and slabs will will occasionally be a problem if there is a high spot where the center of the bottom platform is. That's why tripods are stable - with three legs they will never wobble, even if they are leaning a little.

They look great, but my concern is also that they don't have a big enough footprint. That said, if they are inside against a wall and away from foot traffic and stupid people or normal children - they will probably be fine.

6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

T_Gowan
Posts: 164
Joined: Sun Sep 09, 2007 7:10 pm
Location: Allenford, Ontario, Canada

Re: I can't STAND it!!!

#7 Post by T_Gowan »

You could bolt on out riggers that you could sandbag if you where in an environment that required a lot of stability.
DR200 x2
T24 16" x2
T39 20" x2
DCX2496
DEQ2496 x2
FBQ2496
Mackie DL1608

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Chris_Allen
Posts: 3355
Joined: Wed Jul 11, 2007 2:43 pm
Location: Huddersfield, UK

Re: I can't STAND it!!!

#8 Post by Chris_Allen »

I'd find a standard size water container and change the base so it was a box shape with an open end at the back. I'd go to the venue, fill the containers full of water and insert then from the back where no one could see. Saves carrying around the weight.
Built:
6xDR200, 2xT39, 2xT48, 2xJack110, 1xOmni10.5, 1xAutotuba, 1xT18, 1xSLA Pro, 1xW8, 1xW10

himhimself
Posts: 599
Joined: Fri Nov 13, 2015 9:34 pm
Location: Vancouver BC & Bloomington IN

Re: I can't STAND it!!!

#9 Post by himhimself »

You could bolt on out riggers that you could sandbag if you where in an environment that required a lot of stability.
yep, been thinking outriggers would be a good way to gain more stability. Not sure about the water ballast idea - would probably spring a leak somehow...
Too much going on this week to have any time to get further. Hopefully will get them finished this weekend and then I'll let you know how stable they are.
2xT30 (20", 3012LF)
2xT30 (21", 3012LF)
4xOtop J-array (Beta12, melded/straight piezos)
Truck Tuba (MCM)
Next up: 2xJack12 or family of table tubas

himhimself
Posts: 599
Joined: Fri Nov 13, 2015 9:34 pm
Location: Vancouver BC & Bloomington IN

Re: I can't STAND it!!!

#10 Post by himhimself »

Installed eyes in the bases and tops, put the threaded rod x-braces in, snugged up the turnbuckles, and tossed a jarray stack on top. Actually really solid. I've got t-nuts in the bottom plate of the stack, so can bolt to the top of the stand and not have to use straps. I weighed the bases - they're 30 pounds. Side to side they are very stable. As you guys mentioned, front to back could be a problem if placed where people would be bumping around them, or kids climbing on them. Next to a wall, or up on a low stage out of traffic, they'll be fine. I played with pushing them to the point that they would tip and it would take a serious push to get them to go over, and that's without any additional weighting. Outriggers, say 36"+ unistrut bolted to the base with concrete weights set on the ends would make them rock steady. I don't do any kind of big outdoor events with the crowd milling around like you Bruce, nor drunk DJ parties or metal mosh pits, so these are going to work good for me. And I think they look pretty good - better than such wide boxes up on tripods. Hold tight, I'll get a pic up...
2xT30 (20", 3012LF)
2xT30 (21", 3012LF)
4xOtop J-array (Beta12, melded/straight piezos)
Truck Tuba (MCM)
Next up: 2xJack12 or family of table tubas

himhimself
Posts: 599
Joined: Fri Nov 13, 2015 9:34 pm
Location: Vancouver BC & Bloomington IN

Re: I can't STAND it!!!

#11 Post by himhimself »

Pic
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2xT30 (20", 3012LF)
2xT30 (21", 3012LF)
4xOtop J-array (Beta12, melded/straight piezos)
Truck Tuba (MCM)
Next up: 2xJack12 or family of table tubas

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Bill Fitzmaurice
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Re: I can't STAND it!!!

#12 Post by Bill Fitzmaurice »

Sweet.

Bruce Weldy
Posts: 8301
Joined: Fri Nov 27, 2009 11:37 am
Location: New Braunfels, TX

Re: I can't STAND it!!!

#13 Post by Bruce Weldy »

Those look really nice. Great job.

6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

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Tom Smit
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Joined: Sat Jan 05, 2008 1:24 pm
Location: Sarnia, Ont. Canada

Re: I can't STAND it!!!

#14 Post by Tom Smit »

I was going to hit the "like" button. (I must be on FB too much)
TomS

himhimself
Posts: 599
Joined: Fri Nov 13, 2015 9:34 pm
Location: Vancouver BC & Bloomington IN

Re: I can't STAND it!!!

#15 Post by himhimself »

First outing yesterday and the stands were perfect. Since it was a climbing gym, I was able to attach the stands to the wall with quickdraws so no worries about tipping.
2xT30 (20", 3012LF)
2xT30 (21", 3012LF)
4xOtop J-array (Beta12, melded/straight piezos)
Truck Tuba (MCM)
Next up: 2xJack12 or family of table tubas

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