Hey everyone, I've been wondering how everyone's projects are coming along, so it's only fair to share my own progress with you. So, the PIE 6 and 7 have been my primary focus. The PIE 6 was only built to test the QBD (Quantified Backlash Drive) coupler, and was intended to be cannibalized when testing was done. The motors and electronics were removed and repurposed to create the newest version, the PIE 7. I now wish I had left the 6 in-tact for testing other ideas but that's the way it goes. The PIE 7 is virtually ready for the electricals to be installed, but I am really thinking the increased radius could be a problem, it may not want to come to speed properly. This got me thinking about the weights (masses) and the rectangular shape I made them. Rectangular weights were tried a long while back with relatively poor results, so I am considering rebuilding the way they are connected to the planet gear so they can be mounted 90 degrees from their current positioning. Work continues on my end, how about yours?

So I have a question for everyone. Have you experimented with the inertia of different shapes, with the same mass and moving straight lines (not curved)? Did you see a significant difference? Someone once said flat was better than square or spherical, can anyone shed some first hand knowledge light on that? I'd really like to hear your thoughts or hear about your experiences with shaped masses.

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