Motorized 2-axis photo/video slider

Motorized 2-axis photo slider/video filming In some cases, photo/video shooting requires a multi-axis slider with electronic motion control for synchronous movement and rotation of the camera. There are many professional and expensive devices for this purpose, and there are many great DIY solutions based on different budgets and skills.
The device presented here was created with the aim of making a cheap but convenient and easy-to-manufacture structure that can be placed on a single tripod and powered by standard 5V/USB power supplies. The solution is lightweight and portable, making it ideal for outdoor use. The components for the entire structure cost around $ 20, including motors and electronics. This slider differs from many other solutions by its user interface, the user can precisely set the start and end positions of the camera movement.
Tools and materials: -Profile aluminum tube 1 mx 15 mm x 15 mm – 2 pcs; -Nut for mounting on tripod; -2GT Belt 2 m; -2GT Pulley 20 teeth; -Tension (driven) pulley 2GT 20 teeth; -Step controller ULN2003 – 2 pcs; -Motor 28BYJ-48 – 2 pcs;
-Two plastic double cylindrical gears 30 + 10 teeth, hole 2 mm;
-One plastic double spur gear 30 + 10 teeth, hole 2 mm;
-Steel shaft (length: ~ 10 cm, diameter: 2 mm);
Step one: control unit motor
The assembly and programming process of the control unit is described in detail here. Components cost less than $ 10 including motors. The design is based on very cheap 28BYJ-48 motors and ULN2003 driver boards.
The Arduino code listed in the instructions mentioned above names both the connected motors “M1” and “M2”. It positions both motors as rotary drives, so everything is measured in degrees.
The code here does much the same as before, but the motors are renamed “F” (for linear drive) and “R” (for rotary drive ). Based on this definition, it shows the linear position of the slider in mm instead of degrees, and the drive speed is indicated in mm/min (instead of deg/min). This is a slight improvement, but very useful for estimating the distance (and speed) of a slider.
Calculations from degrees to linear units are based on the assumption that 20 teeth 2GT pulleys are used. If the pulleys are different, you need to change the scale factor at the beginning of the code:
#define MM_PER_ROT 40 //40 mm/rot when using a 2GT 20 teeth pulley – 36 mm/rot when using a 18 teeth pulley.
Motorized 2-axis slider for photo/video shooting Step Two: Print Parts
All parts except “Belt Fixture” attached to this step need to be printed in one copy. “Belt Fixture” is printed in duplicate.
Please note that the “head” presented in this step will in some cases cause the camera to move abruptly. This is because a rotating head takes fewer steps, while a linear motor usually takes more steps. Therefore, the video shows the “jumps” of the rotating engine. This is normal if the user is taking time lapses (slow motion) or short linear movements, or if the user can compensate for “jumps” using GoPro's HyperSmooth mode or the stabilization feature of video cutting software.
The master printed all the parts with PLA filament, layer height 0.3 mm, infill 20%. Some small details are easier to print with margins, only “Slide (Base)” and “Slide (Head)” need supports.
“Slide (Base)” needs to be printed with an inverted “channel”. Since these are the edges that end up sliding along the aluminum profile.
If you plan to use the device mainly indoors, any thread will do. If the device is to be used outdoors, the thread must be resistant to high temperatures and sunlight, i.e. ABS or PETG.
Some parts, namely the side brackets and the tripod mounting plate, can be replaced with simple plates cut from wood or sheet metal.
Print details below.
Slide (Base) .stlSlide (Head) .stlTripod Mount [url = https: //] Plate.stl [/url]
Base Socket.stlBelt Fixture.stlBelt Tensioner.stlLeftight Side Bracket.stlRcket stlGoPro Mount.stl
Motorized 2-axis slider for photo/video shooting Motorized 2-axis slider for photo/video filming Motorized 2-axis slider for photo/video shooting Motorized 2-axis slider for photo/video filming Motorized 2-axis slider for photo/video shooting Step Three: Assembly
First you need to drill some holes in the aluminum profiles. When drilling, the master uses a 5 mm drill. Holes need to be made for the base and for the left and right side brackets.
For drilling, you need to install the plastic part on one of the aluminum profiles and slide it in the center. The base sleeve is 100mm long, so you need to measure 450mm from each end of the profile. Then mark the holes and drill.
Having installed the details along the edges, mark and drill the holes at the ends of the profile.
 Motorized 2-axis slider for photo/video shooting Motorized 2-axis photo slider/video filming Next, you need to put the slider (base) on the aluminum profile (on which there is no hole for tripod mounts).
Motorized 2-axis slider for photo/video shooting Slide the left and right side brackets onto the profiles. Uses four M5x30 screws and four M5 nuts to secure them.
Installs the bottom center piece. It uses two screws M5x30 and two nuts M5.
Motorized 2-axis slider for photo/video shooting Next installs the controls.
Secures the motor and installs the pulley. Stretches the belt and fixes it to the carriage by adjusting the tension.
Connects the power supply. Performs a test inclusion.
Motorized 2-axis slider for photo/video shooting Now it remains to install and connect the second motor, which is responsible for rotating the camera.
Step Four: Quick Operation Guide
After power on, the system will show the “Execute” menu. The menu is used to move the camera between two specific positions (middle button: go to start position; right button: go to end position). Since the start and end positions are not programmed, go to the next menu by pressing the left button.
In the second menu (“M1 Start” or “F Start”), the middle and right buttons are used to move the linear axis forward and backward. After setting the starting position for this motor, press the left button to switch the menu.
In the third menu (“M2 Start” or “R Start”), you need to set the starting position of the rotary axis in the same way as the starting position of the linear axis earlier.
In the fourth and fifth menus (“M1/F End” and “M2/R End”), both axes must be moved to the desired end positions. Then you need to press the left button to switch the menu.
In the last (sixth) menu, you can decrease or increase the speed of the slider by pressing (and holding) the middle or right button. The display will show the speed and time required for the slider from the specified start point to the specified end position. When the speed is set, press the left button again.
You are now in the first menu again.
You can learn more about all the functions here.
Motorized 2-axis photo slider/video filming Step five: additional improvements
The 28BYJ-48 has gears built in, and it takes 2038 steps per revolution (not a “perfect” 2038 because the gear ratio is a little odd). The device uses a “half step” mode, so it is even more accurate. The resulting 4076 (half) steps will give a resolution of 0.08 degrees per half step, which should be sufficient for shooting. Plus, the HyperSmooth feature in the newer GoPro models is pretty good at eliminating vibrations. However, in some situations, you can still see small “jumps” in the pivot axis.
Usually the slider turns the camera head by about 45 … 180 degrees in one “movement”, so the motor will take 509 … 2038 steps. At the same time, one full revolution (4076 steps) of the feed drive moves the chamber only 40 mm. As a result, the rotating motor only moves every twentieth movement of the feed motor. Although all these steps are very small, they affect the quality of the shooting.
For better stabilization, an (additional) gear with a gear ratio of about 1:10 is needed.
The master has developed three gears of different designs with this gear ratio.
You can download parts for 3D printing here.
Motorized 2-axis slider for photo/video shooting Everything is ready .
Motorized 2- axial slider for photo/video shooting


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