View Full Version : So I'm building a jib...
And it's nearly complete. I have all the parts assembled but I'm not comfortable with the bolts and nuts I am using at its tilt point. Sure the crane tilts but in the process it loosens the bolts a bit. Last thing I want is for my DVX to fall from 12 feet in the air.
Does anyone know how to alleviate this problem? I was thinking that I could weld the bolt on but that's rather drastic and I don't have any welding equipment.
Sorry I don't have pictures. I'm going to get some up as soon as I have access to my digital camera.
Larry R
07-01-2005, 03:40 PM
Use Loctite Adhesive...you put it on the threads, then tighten the nut on the bolt and a chemical reaction occurs that is as strong as welding.
http://www.amazon.com/gp/browse.html/sr=3-3/qid=1074562437/ref=sr_3_3/102-6622760-6168931?index=merchants&node=4063301&keywords=&merchant=A2LM8ZC59IT9RX&price=&brand=Loctite&material=&cuisineNode=&sale=&sizefit=&size=24
Ah cool! Thank you kindly sir!
Sirius_Doggy
07-01-2005, 03:44 PM
The heck with the camera, what if that thing collapses while it's hovering over a crowd of people???
GenJerDan
07-01-2005, 03:59 PM
LocTite? Hmmm...
I'd use a castle nut and a cotter pin.
Actually, I'd run a sleeve through the pivot point and have the bolt go through that, rather than having the jib pivot on the bolt itself. Assuming the jib arm is aluminum, you probably don't want the wear & tear on it...
Dan
Mmm interesting suggestion about the sleeve. Though I must ask; what is a castle nut and a cotter pin?
Excellent point serious doggy! I'm not worried about the entire thing collapsing, just the camera mount bracket falling off. Granted, that would still hurt like hell... so, excellent point :)
thisiswells
07-01-2005, 04:35 PM
I think those are German words. I'm continually amazed at the highly technical language, Dan. The whole "firewire optoisolaters" thread really threw me in for a loop. I still have no idea what an optoisolator is, but surely it would do the trick if it exists...
Brian
jollo
07-01-2005, 04:38 PM
Castle nut (http://www.jamestowndistributors.com/ak/Fasteners/Nuts/Castle_Nuts_fam/)
Ah, interesting. Thanks for the link. I think I'll just go with the locktite unless anyone can point out a large advantage of the castle nut and cotter pin method. I won't need to remove these so...
GenJerDan
07-01-2005, 05:51 PM
I think those are German words. I'm continually amazed at the highly technical language, Dan. The whole "firewire optoisolaters" thread really threw me in for a loop. I still have no idea what an optoisolator is, but surely it would do the trick if it exists...
:engel017:
Oh...an optoisolator...
Basically, an LED on one end and a photocell on the other. The LED goes blink blink blink with the digital signal, and the photocell "sees" it, re-generating the signal. (incredibly over-simplified, and not really how it works these days...but the principle is the same.)
The salient point: there is NO electrical connection between the two sides of the circuit. Just a light beam. :)
Dan
PDX_DVX
07-01-2005, 05:53 PM
You could also use a nut that has a plastic insert, they work really well. I think they just call them safety nuts, you should be able to find them at the local hardware store. You could also try safety wiring the bolts.....
http://www.sportrider.com/tech/146_0002_hand/
Jay Rodriguez
08-03-2005, 10:44 AM
hey, really curious here.... how did everything turn out? did you complete it?
danslak
08-04-2005, 08:20 AM
If you want that bolt to never ever move, get some JB Weld. It's a 2 part adhesive for metal. Once it dries, it's damn near a weld.
Dan
www.DVcameraRigs.com
Thanks Dan.
Coffee: no sadly not. It's still laying in my basement 85% complete. I decided to redesign the whole mounting bracket for the camera for better stability and control. I did find a nice block of iron that I drilled and tapped which I now have bolted only the rig. Makes a great counterweight and it's simple to remove.
pmark23
08-04-2005, 11:22 PM
Kinda late, but I just went through this how-to-tighten-a-nut-thing while building a ultralight one-man dolly a couple days ago (pics soon, building ultralight track now).
Put on two nuts, and tighten them against each other. They'll never come loose unless you use a wrench on BOTH of them, and it's easily and quickly adjustable.
Hmm interesting suggestion. I may give that a shot. Thanks for the tip!
givemefood
09-01-2005, 04:00 PM
I would atleast describe what i used to design and develop this jib. Isn't that the primary reason for this section of the forum?
Im interested in building one for myself. Can u layout your design here?
Thank you.
Sure. But considering that it's still not complete (so many things to tweak so little time) it may or may not be what you are seeking.
Give me a few days. I have some other things I need to take care of first.