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Old June 3rd, 2006, 11:18 AM   #1
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slow crawl with a dolly

I heard many mention trying to acheive a slow crawl with a dolly, and some people talked about hooking up some sort of slow turing motor to do this smoothly. Well, I have an idea and want to hear what you all think. What if you mounted a fishing reel (just the reel) to a 2 foot long 1"X6" board, stood on each end of it with the reel between your feet, and literally reeled the dolly towards you. With some heavy fishing line and a low gear ratio reel, you could keep the speed consistant. What do you all think?
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Old June 3rd, 2006, 06:27 PM   #2
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That sounds like a reel great idea!
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Old June 3rd, 2006, 06:39 PM   #3
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Fishing reels usually have a rather fast retrieve: They're geared that way to get the line in quickly. Some have two speed settings to deal with heavy loads (something we all wish for) or for a fast retrieve in case the fish makes a run toward the boat.

If you want to use a motor, there are geared low-speed motors that run film processors, etc, which might be available at surplus outlets. There was a place here in Honolulu that sold stuff like that but they went out of business.

Or you might want to create a simple hand-cranked, spool-type device. Use a long handle with a small spool and you'll get a slow retrieve.
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Old June 3rd, 2006, 10:54 PM   #4
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Yeah

Yeah after I posted this, I played with some of my fishing reels, and they are kind of fast at the retrieve. That's when, like you said, I realized some type of big handle/little spool type device would work best. I just figured it would be a lot cheaper than a motor, and its speed could be variable as well.
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Old June 3rd, 2006, 11:46 PM   #5
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How about a boat trailer winch. They have a nice thick strap, and a low gear ratio. Just need to hold or remove the ratchet mechanism.

Just something to think about.

-gb-
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Old June 4th, 2006, 01:50 AM   #6
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Or a garage door opener. You can even operate it with a remote control. :)
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Old May 8th, 2008, 05:55 PM   #7
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reviving this as I want to do this so i can do timelapse dolly shots...
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Old May 8th, 2008, 07:16 PM   #8
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something like this ?

http://www.trevswork.com/mo/
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Old May 11th, 2008, 10:32 PM   #9
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You can use a motor from a rotating disco ball. You can find them here: http://www.sciplus.com/singleItem.cfm/terms/12254

5 rpm and runs between 6-12 V DC, (very easy to keep it portable). You can attach a larger pulley wheel to the motor to collect the string attached to your dolly.
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Old May 12th, 2008, 12:31 AM   #10
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Even better...........

And with a bit of luck, even free!

A surplus/ trashed battery powered drill. See 'em turfed out every day (usually 'cos the NiCad's have died).

The motors/ gearboxes have more grunt than you'd give them credit for and have speed control built in, the chuck allows you to afix just about any type of spindle/ reel system you can devise and most will work off a 12 volt lead acid battery no matter what their stated voltages are.

Worth a try.


CS
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Old May 12th, 2008, 03:53 PM   #11
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it needs to be REALLY slow though
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Old May 28th, 2008, 12:37 PM   #12
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Quote:
Originally Posted by Phil Bloom View Post
it needs to be REALLY slow though
Make it a union job? ;)
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Old May 28th, 2008, 03:37 PM   #13
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Hello Philip,

How slow is slow?

1 meter/second? 10 cm/second? 1cm/second?

Slow speeds does not necessarily mean small motor... For a decent move with no vibrations you will need a strong motor with a big rotation-reducer. In combination with a small pulley you have the power and reduce the speed.
A slow rotating motor will always have its vibrations: So you will need to let your motor run at max speed and reduce speed with gearboxes and pulleys..

A source could be an electrical step?

Onno Perdijk
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Old May 28th, 2008, 03:42 PM   #14
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btw:

a 2000 rpm motor with a 1/30 reductor and a pulley of 6cm will give you a max speed of 21 cm/second....

This combi can pull a 50kg straight-line. So the dolly-weight on smooth running track can be over 200kg... (just finished math-school, :-) )

Onno
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Old May 28th, 2008, 03:45 PM   #15
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can you make me one?
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