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Mostly it's overbuilt by starting with 100mm tubing and having some pretty burly gearboxes. Unless you are stalling motors at the operating speed you want to move at, I don't think there's much reason to remove bulk at this point. Something to consider is, assuming you are pulling the weeds straight up... the resultant force on your frame is downward. So it should be more stable/firmly planted while it's pulling the weeds, and likely could have been more lightweight to start. Really the bulk isn't a problem at all, just costs a bit more from the get go, Looks awesome!
This is so rediculously over built. haha it's awesome !
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cool idea, looks like you could use this to make wooden ball screws for various equipment/vises/clamps
I've made a similar clock before. If you dont have access to a laser cutter the proper tool to use is a hot-knife. Basically a soldering iron with a scalpel tip on it. Records are fairly brittle and don't cut well by traditional means
hot knife. like this: https://www.amazon.com/Dremel-1550-Versa-Multipurpose-Tool/dp/B0000302YM/ref=sr_1_2?ie=UTF8&qid=1473637065&sr=8-2&keywords=hot+knife
Awesome Build! Just a heads up... I see you have the NEMA 34 motors bolted to the mounts with a screw and standard nut. From experience I've found it really difficult to get a wrench on the nut, and the motors are pretty prone to vibratory loosening. An easy fix is to use a standard 1/4-20 SQUARE Nut, with a 1/4-20 cap screw. the square nut will be trapped by the in-cut square corners on the motor, and allow you to tighten them from the screw side w/out putting a second wrench on the nut. probably would work with an M6, but the 1/4-20 is a very good fit.
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