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FORUMS Photography Talk by Genre Transportation Talk
Thread started 21 Apr 2008 (Monday) 10:35
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Official Automotive Rigs - DIY Thread

 
p27rpy
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1,418 posts
Joined Oct 2010
May 14, 2012 13:44 |  #6961

Haven't posted in here in a while! Recent rig shot:

IMAGE: http://civitello.smugmug.com/Cars/Lotus-Elise/i-xGdPg7T/0/XL/Lotus-Rig-XL.jpg

Theo Civitello - Houston Based Automotive, Wedding & Life Photographyexternal link
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VisualEchos
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Joined Feb 2010
Missouri
May 14, 2012 16:33 |  #6962

spb wrote in post #14429813external link
For structural beams, what matters in their resistance to deflection is their second moment of area (often referred to as moment of inertia) or "I".
If you have two beams that are made of the same material same length, all you have to do to compare their stiffness is compare their I's.

For a square hollow beam with cross section dimensions
a=outer side,
b=inner side:
I=(a^4-b^4)/12

For a round hollow tube with cross section dimensions
a=outer diameter,
b=inner diameter:
I=(a^4-b^4)*(π/64)


Now if you want to take in account the length and material, you need to introduce:
L=length,
E=modulus of elasticity (property of material, may be found on matweb.com)
q= lb/ft weight of the beam per foot (approx. cross sectional area * density)
P=load due to camera mounted.
δ1=max deflection (at the end of the beam) due to the weight of the beam.
δ2=max deflection (at the end of the beam) due to weight of the camera.
δt=max total deflection

δ1 = (q*L^4)/(8EI)
δ2 = (P*L^3)/(3EI)
δt = δ1+δ2

Assumptions:
-Camera is mounted at the end of the beam.
-Weight of the beam is uniformly distributed.
-Cantilever beam.

Dude, just tell us which is stiffer up-to-down lol.


~Andrew from Rig-Proexternal link Galleryexternal link

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StE823
Senior Member
430 posts
Joined Aug 2008
Toronto
May 14, 2012 16:44 |  #6963

What the hell, I'm not an engineer and I never calculate the stiffness when I built my rig four years ago.


http://www.shutterlit.​comexternal link

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Spikeydevilbandit
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Joined Nov 2011
Surrey, UK
May 14, 2012 23:52 as a reply to post 14428491 |  #6964

QUOTE=Johandyman; to make sure all of the water is absorbed equally fast?

LOL .... OMG, I don't know what you were doing in your biology class at school ... looking out the window maybe?


EOS 1D MK iv, EOS 5D, 17-40L, 24-105L, 70-200 IIL f2.8 IS, 1.4x II, 580EX
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spb
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582 posts
Joined Nov 2009
NH
May 15, 2012 08:38 |  #6965

just wanted to get it out of my system.


60d | 50d | grip | 11-16 2.8 | 17-55 2.8 | 50 1.4 | 24-105 | 70-200 II | 60 macro | 580EXII x2
flickrexternal link | gear | feedback

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Johandyman
Member
141 posts
Joined Sep 2011
Allerød, Denmark
May 15, 2012 11:52 |  #6966

Spikeydevilbandit wrote in post #14433190external link
QUOTE=Johandyman; to make sure all of the water is absorbed equally fast?

LOL .... OMG, I don't know what you were doing in your biology class at school ... looking out the window maybe?

take a joke dude ;)


Johandyman.dkexternal link
"Oh, and sometimes more length isn't better" - GFWilliams

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Indecent ­ Exposure
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Joined Jan 2007
Austin, Texas
May 15, 2012 16:38 |  #6967

Are there any good off-the-shelf bags to carry and store the 5' poles in? What are people using? Inquiring minds want to know...


- James -
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Johandyman
Member
141 posts
Joined Sep 2011
Allerød, Denmark
May 15, 2012 17:11 |  #6968

Indecent Exposure wrote in post #14436644external link
Are there any good off-the-shelf bags to carry and store the 5' poles in? What are people using? Inquiring minds want to know...

i believe many use fishingrodbags for the poles themselves, i reckon a hificase for the small stuff would be good?


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"Oh, and sometimes more length isn't better" - GFWilliams

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Indecent ­ Exposure
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Austin, Texas
May 15, 2012 17:43 |  #6969

Interesting. I'll have to check those out. Thanks.


- James -
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apixelintime
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Joined Dec 2008
Dee Eff Dubb! (N. Texas)
May 15, 2012 18:26 |  #6970

Check out shotgun cases at Walmart...


Christopher Cross | Apixelintime.com | Nightographer.com (coming soon)
Altering reality one pixel at a time.
A clicky thing | Severial twisty things | A couple of flashy things | A bunch of other things
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Boobo-oobo
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Joined Apr 2009
Igrišće
May 16, 2012 05:04 |  #6971

IMAGE: http://www.deviantpics.com/images/DtHEq.jpg

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Nico76
Junior Member
23 posts
Joined May 2012
May 16, 2012 05:04 |  #6972

First time poster, long time reader - well more precisely it's taken me just over a week to get through all 465 pages of this thread!

Each page has been a huge inspiration, so much so that I've just ordered my own kit to build my first rig!

I've gone the usual route as below:

2 x Suction Cups with swivel pins (I went Woods over Avenger)
2 x Manfrotto Super Clamps

I plan to hard fix a ball head (I own both 498RC2 or 484) to the end of the boom as I'm very sceptical as to the rigidity of a Magic Arm at the end of the boom

After reading the entire post, I'm still unsure as to the best way to fix the sections of boom together???

I think it's time that this thread has a definitive guide as to what is the preferred Boom specs:

1. Total boom length
2. Length of individual sections
3. Outside diameter
4. Wall thickness
5. Aluminium grade (if known)
6. Joining method of sections (Personally, this is the most important part!)

The above will help noobs like me a great deal & avoid new rig builders having to reinvent the wheel each time!

Thanks again for all the information / inspiration so far & thanks in advance for adding your boom info as above to this thread.

Cheers, Nico.


See www.facebook.com/fastf​rames for more High Performance photography...

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MccM
Member
60 posts
Joined Sep 2009
Chicago
May 16, 2012 10:02 as a reply to Nico76's post |  #6973

First attempt, let me know what you think

IMAGE: http://farm8.staticflickr.com/7231/7207519406_ee4c86d9eb_b.jpg

T1i, 18-55mm f/3.5-5.6 IS, 50mm f/1.4, Sigma 10-20mm , 430ex

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vdubtornado
Member
181 posts
Joined Oct 2007
Portland, OR
May 16, 2012 11:55 |  #6974

I am selling my setup if anyone is interested in it!
http://photography-on-the.net .../showthread.php?t=1​186061

IMAGE NOT FOUND IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR

IMG_3419 (external link) by Ignatius McCarthy (external link), on Flickr



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Ando27
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Joined Jan 2012
New South Wales Australia
May 16, 2012 19:17 |  #6975

MccM,
....if this is your first attempt, man youve got a damn good handle on this thing already.....

Nico 76..

Your request.
1. Total boom length............15'
2. Length of individual sections....3 x 1.5meters
3. Outside diameter..............​.48mm
4. Wall thickness.............​..2mm
5. Aluminium grade (if known).......NFI
6. Joining method of sections (Personally, this is the most important part!)....machined sleeves ID 49mm,..bolted.

Still plaiyin & waitin for my own 10-20mm Lens.

Al


Ando.
"Down Under"
[CENTER][B]Canon 1D4 / 5D3 gripped / 7D gripped / 300f2.8 IS L / 100-400f5.6 L / 70-200f2.8 IS II L / EFS18-200IS / 24-105 f4 IS / 10-20 f4 / 580EXII x 3 /1.4 TC III / 1.4TC II / 2 TC III / 15' Rig / 20' Rig.[CENTER]

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Official Automotive Rigs - DIY Thread
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