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Re: Driving up the portcullis
We've had the same idea too. There are ball bearings on the sides at the top, and I believe a wheel at the bottom that will roll along a track.
You should allow for more than 5lbs of force - motors should generally be run at under 50% of maximum torque and you should account for some friction too.
Please post back and let me know how things work for you.
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