Bead Chain Gear Drivetrain and Enclosure (fully parametric)

by adgaudio, published

Bead Chain Gear Drivetrain and Enclosure (fully parametric) by adgaudio Dec 29, 2012
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I'm building an automatic window blind system to raise and lower window blinds (in response to user and sensor input).

The openscad code is fully parametric and designed to be both customized and modified, and easy to install.

This system generally should work for situations where a bead chain needs to be moved, but is fairly loose and prone to skipping.


IN PROGRESS (need to build on wall mounts, which aren't shown here, but the components available for download are working perfectly!)

The scad code (see github link below) is fully parametric. It's also namespaced, so it should be fairly simple to manipulate, and do things like use different gears or change the bolt size.

Check out the latest openscad code on github:

Other Parts:
1 x m8 30mm bolt + nut
6 m8 washers
1 x 608zz bearing (or other same sized bearing)
2 x m3 20mm bolts + nuts + washers
2 x m3 10mm bolts + nuts
1 x stepper motor (http://www.allelectronics.com/make-a-store/item/SMT-108/STEPPER-MOTOR-6-WIRE/1.html)

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Hi PaulHam,

Unfortunately, it looks like that link has become invalid. I don't have an exact link to that stepper motor, but you may want to look at DigiKey for a similar replacement. I would modify the scad file posted on github to fit any stepper of your choice: https://github.com/adgaudio/3dPrinter/blob/master/gears/bead_chain_gear.scad

You could use any motor if you modify the scad file and find a good way to bind the shaft to the gear. Good luck!

Thanks for your reply!

Do you have a up to date link or model number for the stepper motor?

I'm glad you guys are interested! I'm currently fine tuning the parameters to sizes that fit the above parts, and the parts are coming out pretty well! Once I've put the pieces together, I'll probably add a section on electronics. This will also need a mount plate or some kind of bracket to fix it in place (to the wall in my case). I'll keep you updated with progress!

In the mean time, the latest version is on github. :)

Sweet, I was gonna do something similar, now I just need to tweak some parameters :D

excellent.. I have been thinking over a design to move two blinds (one clear and one opaque) to give a window more insulation (long story, but it involves a cat door in the window) and your design is very helpful.. Looking forward to it evolve.