VEX part strengths

[efoote868]

Thanks for testing with pliers.

After talking with my group, I think we're going to be using a combination of vex, erector/meccano, and a 3d printer.

The 2-Wire 393 motor has a free spin of 100 rpm, so if we gear it down 60:1 the output will be about 10 degrees per second (less, considering an added load).
This also gives it a stall torque of 885.6 in-lb, which should be enough .

Even better is the integrated encoder module at 627.2 per revolution, or 104 ticks per degree geared.


Once we have more things figured out, I'll make sure to share.

[efoote868]

Figure I owe CD an update on this project. We're done, and I'm about to graduate from Purdue.

http://www.youtube.com/watch?v=rroVH...ature=youtu.be

Not sure when the project's webpage will be archived, but until then it'll be here:
https://engineering.purdue.edu/477grp18/


The self-aiming telescope uses a compass and an accelerometer to form a coordinate system. It also uses a GPS to determine the time, as well as the position on Earth. The telescope communicates to an android device via bluetooth, the android device sends the star coordinates to the telescope mount, which calculates an offset and automatically moves the telescope.

VEX components used include the 269 motors and integrated encoders, along with gearing. Final gear ratios are 63:1 for elevation, and 16.5:1 for rotation.

The telescope's movement is accurate to within a tenth of a degree. Let me know if you have any questions.

[connor.worley]

This is really cool

[Taylor]

That. Is. Awesome.

PM sent.