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I like that non-hydraulic Cat Excavator with the screw drive for the boom - who makes that? please.
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Jim,
it is actually quite simple. You have to modify a servo to turn endlessly. You need an adapter for the wood drills. As a counterpart, a brass tube is cross-pins provided with 2. These pins engage into the groove of the wood drills and will leave from the rotating motion linear motion. Rather, it is not. I hope it is understandable.
I have another idea for an oil-free drive. However, I need some time until it works. Once it works, I will report here.
Manfred