15mm Rail Mount For NEMA 17 Follow Focus Stepper Motor
by anewsome, published
My follow focus system uses NEMA 17 stepper motors so I needed a reliable way to mount the stepper motors. I also need to be able to move the system from camera to camera quickly, as well as perform lens changes quickly too.
Since I've printed a pair of these to use on my rig, they've performed flawlessly. I use one for the zoom gear and one for focus.
I'm pretty happy with them so I hope you get some use out of them too.
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Well I made the software, so I used the Java programming language. I actually learned Java specifically for this project. I bought the Java for Dummies book on the same day I bought the stepper controllers from Phidgets.
I also implemented MIDI capability in my software. This allows me to use any wireless MIDI app on my iPad/iPhone to control my lens and motion control rig, without needing to program any software for iOS.
If you want to create a lens control system it's not hard. There's dozens of different controllers and bits that you can choose to use. If you're not the type who likes to create your own hardware and software setup, I'd recommend a system that works out of the box. Varizoom, Kessler, Jag35 and dozens of others make lens controls systems that are complete.
Thanks for your reply. Which software did you use to make this? Please can you tell me how can I attach remote with one motor or with both motors for focus and zoom?
Thanks in advance.
Hello harvestmedia. These stepper motors are most likely quiet enough to use during a live event. As with any kind of motor, the faster the motor is moving, the more noise it will make. Lens rings don't need to turn very far, so typically, you can run the stepper at a speed that is silent enough for you. My system certainly could be powered by the F3 battery but since my motion control rig has 6 stepper motors, 6 stepper motor controllers and a single board computer, this isn't really practical for me.
My control system is all self made, that is I purchased stepper controllers from Phidgets and I wrote all of my own software to control the entire rig, lenses and motion. There's a few dozen videos of my rig in action online, but here's one that I really like, showing off my "auto-track" feature, which allows you lock the camera on a fixed target, create a sliding move and the linear motion, pan, tilt and focus all work together to keep the subject in frame and in focus: https://dl.dropboxusercontent....
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You'll need a 3/4 inch long 1/4"-20 screw and a hex nut to go along with it.
Mount your stepper motor with 4 M-3 screws and you're all set. The 15mm rail clamp works nicely for me, hope it does for you too.
If you're looking for gears to mount on your stepper motors, I get all of mine from servocity.
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