Tag Archives: motorized slider

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I was testing this about a week ago, but finally published it to the public. Taking all the same little electronics from the JuicedLink DIY slider project (continuous servo, servo driver, and battery case) the little Pico Flex dolly is moving on it's own. The speed is variable and with the size of the pulley. It can go really slow, but what you see is the fastest setting it will go. A piece of scrap acrylic plastic and double sided tape was all that was used to mount it temporarily while I try to figure out the cheapest and best way to drive this thing.

A rubber band pulley system didn't do so well. The band would stretch and when there was enough tension built up, it would snap back causing a jerking motion. The direct drive was the simplest way to turn the Pico wheels and was much more consistent. Using this technique could apply to all existing Pico Flex Dollies without replacing any existing parts. The servo is extremely strong and since the Pico moves with little effort, it can move quite a bit of weight.

Another Clever Pico Flex Dolly Modification - Motorized + Lasers

YouTube Member dim3m has motorized the Pico Flex, and has also added lasers for an easy way to identify the rotating axis. This is a common practice used in those high end three wheel skater type dollies. By aligning the axles with the lasers, the cross path will be the center of rotation. This is where you need to focus your camera. Right now the lasers are just temporarily being held on with Friction arms as a proof of concept. [Thanks dim3m] You can find pen lasers fairly cheap these days in just about any store, but if you're lazy they can be found online for about $1.49 (click here)

Mini Laser
find-price-button Mini Pen Laser KeyChains

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Juicedlink first introduced this slider idea as a prototype during NAB2011 (found here). The kit consists of a few different parts which are bundled or sold separately. The basic set will have at least a trolley (rolling carriage) and end clamps to hold a set of rods. The end clamps have three 1/4-20" threaded taps to mount stands. A benefit to this slider kit is that you choose any type and length of 5/8" rod you require. You're not limited to specifically choosing a 24" or 36" like IGUS or Konova sliders. With JuicedLink, you can carry multiple sets of rods if you want to run short or long. Suggested rails to be used are stainless steel rods for it's clean smooth surface and hardness, which run about $20 dollars each for 4 feet (48").

JuicedLink-DIY-Slider
find-price-button JuicedLink DIY Slider Kit

The setup in the video (above) is on 4ft. stainless steel rods with a few modifications done to get it motorized. This is pretty much the same equipment used on the motorized Konova slider by Vimeo member C Light. On one end I have a freewheeling Idler Pulley. On the opposite end is the servo motor, servo controller, and 4 AAA battery pack. These all simply plug in together seamlessly without any soldering to give you a reversible slow speed motor. For the string, i'm just using Nylon Mason Line. Fairly thin, but strong, and readily available at your local Home Depot. I decided on using Velcro at the ends so that I can adjust the tension of the Line. Below is the remaining parts list of what you'll need if you wanted to do this to other sliders.

Basic servos will not rotate 360 degrees. Here you'll find the Continuous Rotation Servo: https://www.hobbyengineering.com/H1429.html
continuous-servo

You'll require a pulley to be mounted on the servo. This fits perfectly and has the proper amount of teeth to fit flush: https://www.servocity.com/html/pulley_wheel__futm2045_.html
servo-pulley

To control the speed and to make the servo move in reverse, you'll need the servo controller: https://www.servocity.com/html/dual_servo_driver.html
servo-driver

To power things up, you'll need a small battery pack. This battery pack will simply plug in to the controller. https://www.servocity.com/html/battery_trays.html
aaa-battery-tray

It's definitely a smooth slider, but the design means you'll need two stands to elevate it. It's important to get solid stands on each side if you want to minimize any rocking or swaying when used in windy environments. Especially if you're shooting with a long lens. Before you consider the JuicedLink DIY slider kit, you should check out some important information about the slider over at the JuicedLink website. He's started a 'CookBook' of ideas and tips about using the slider, and pointing out a few things to keep in mind when going to a longer set of rods. You can find more information and pricing on the JuicedLink sliders (click here).

juicedlink-slider
find-price-button JuicedLink DIY Slider Kit