I just wanted to share what I’ve been working on.
It’s a real mix of many designs i’ve seen, but It’s still evolving - this has 3D printed bits drilled and bolted on with minimal planning!
At the moment it will be a single gearbox motor on the take up, with a friction drive on the supply.
Future build will hopefully have a motor on both supply and take up, and a dancer arm for the PID feedback.
light source is diffused in a sphere printed as a square for easy mounting.
The gate is inspired by the blackmagic cintel, where the gate forms the top of the sphere to get the film as close to the diffused light as possible.
The bearings are fixed at 8mm apart, but I’d like to have two on one side adjustable with a set screw or light spring to hold side tension on the film edge to handle variations in film width.
The gate plate is large enough to make a 16mm version too.
I’m using a keyence sensor for the perforations.
The camera is the 3mp FLIR chameleon I bought 2nd hand.
It can also handle strobing the LED for the light source via a mosfet when the exposure is active.
It’s mounted on a eBay 3 axis linear slide which is actually really nice. Very solid!
I’ve only just got to where I am with hardware, so now I will work on getting the motor speed controlled to a constant 18fps or similar.
There is a rotary encoder on the RHS of the gate, I might use that for film speed, or just the pulse data from the keyence sensor.