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 Motor of choice to drive a 6foot crane? 
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Joined: Wed Mar 24, 2010 5:55 pm
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Post Motor of choice to drive a 6foot crane?
I've got a camera crane I'd like to motorize. It's just a little 6 foot deal (2x4 accross the pivot) so the camera would move twice as fast as the pulled/operator end. I need it to absolutely creep because I'd like to use it at night but mostly I just want to make sure it's strong enough to pull it. I'm just looking for something similar to what Tom did here.

viewtopic.php?f=7&t=3207&hilit=crane


I'm thinking I can just run a kevlar line but I guess I could go with a belt. I figure I'll build some sort of base and use a decent size battery for ballast. Assuming a 12v setup, what should I be looking for?

Thanks!


Fri Mar 04, 2011 10:53 am
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Post Re: Motor of choice to drive a 6foot crane?
i would just get the DP MX2 and stock motor. As long as the crane is balanced you can move it with almost any motor. wont take much force if its balanced

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Fri Mar 04, 2011 2:41 pm
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Post Re: Motor of choice to drive a 6foot crane?
Well that would be somewhat convenient since I have one on order......

Might as well use the belt if that's the case. Not sure how I'd tension the loose end on the ground after passing through the drive gear though.

Back to the string approach, where's a good source for pulleys if I wanted to just wind up the line as it comes into the motor (fishing reel style)


Fri Mar 04, 2011 3:20 pm
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Post Re: Motor of choice to drive a 6foot crane?
For a good source of pulleys... I just bought a mini bench lathe so I can make things to fit, saves a lot of headaches in the long run if you are building a lot of custom gear.

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Fri Mar 04, 2011 4:11 pm
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Post Re: Motor of choice to drive a 6foot crane?
While I'm always looking for an excuse to buy new tools, I'm not getting a lathe ;)

At least not yet.

I know these pulleys exist because I've seen them on some of the dolly rigs people here have built.


But looking at the torque rating of the motor I have which is this

http://www.servocity.com/html/1_rpm_gear_motor.html

And considering that I can get my crane pretty well balanced, I think I can just use that one. My electronics knowledge falls somewhere between that of a french fry and an old tire so I have no idea what resistance potentiometer I'd need to drop the speed below 1rpm.


Fri Mar 04, 2011 5:10 pm
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Post Re: Motor of choice to drive a 6foot crane?
try this place https://sdp-si.com/eStore/

i got my belt pulleys from there

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Fri Mar 04, 2011 5:28 pm
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Post Re: Motor of choice to drive a 6foot crane?
i just tested out a 12' kessler crane with the servo city motor i use for my timelapse dolly and it worked great.

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Fri Mar 11, 2011 8:27 am
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Post Re: Motor of choice to drive a 6foot crane?
peppino wrote:
i just tested out a 12' kessler crane with the servo city motor i use for my timelapse dolly and it worked great.



Good to hear. I put together a 2x1.5 C cell battery pack in series to drive the 1RPM motor I have at 3v. It works fine for the dolly I built so I'm going to see if it will for the crane.

Thanks!


Mon Mar 14, 2011 1:31 pm
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Post Re: Motor of choice to drive a 6foot crane?
Kevin,
You can see my video of the crane and how it hacked it all together. I strung the loose end of the belt through a ring at the bottom of a tripod and then attached some weight to it to keep tension. its a hack, but worked perfectly. Im also using the servocity motor, manual driver, and speed control that i use for my dolly. I do have to say, everything worked out perfect for this test. Setup is not final or ideal, but im working on a cleaner solution. will let you know what i eventually come up with for a final solution.


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Thu Mar 17, 2011 6:12 pm
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Post Re: Motor of choice to drive a 6foot crane?
That's pretty much it! :D


Thanks for the vid man I appreciate it.


I'm going to try a setup with some kevlar line I've got. I still need to figure out a pully system. I can't really find one that's a small diameter that I could wind up the line on....... I might just end up using a thread spool or something ghetto.


Fri Mar 18, 2011 8:51 am
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Post Re: Motor of choice to drive a 6foot crane?
I was thinking about the line/cable method, but i could not find a good solution to wind it up on so i just went with the belt method. if you come up with a good solution using the line/cable method let me know. Am curious to see what you come up with.

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Fri Mar 18, 2011 9:02 am
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