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Author Topic: Estimating Counter weight needed
wandrson
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Posts: 23
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Post Estimating Counter weight needed
on: June 8, 2014, 23:00
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In the instructable for the Polargraph, you indicate that you use about 150g counterweights. Am I correct in assuming that your counterweights (two of them) are about 300g and that the gondola (plus pen) also weigh about 300g?
sandy
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sandy
Post Re: Estimating Counter weight needed
on: June 8, 2014, 23:28
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My gut tells me the combined counterweights are heavier than the gondola, but I'll check tomorrow. They are not intended to be finely balanced, because the gondola moves around, the weights and motors work with each other, assisting or in opposition, and so there is no "correct" weight. I left that bit vague deliberately to discourage you from paying it too much attention 🙂
wandrson
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Posts: 23
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Post Re: Estimating Counter weight needed
on: June 9, 2014, 00:11
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What can I say, I am an Engineer at heart. I like numbers! And since my last gondola print failed at about the 90% point (extruder jammed). I need something to take my mind off of my troubles!
sandy
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sandy
Post Re: Estimating Counter weight needed
on: June 9, 2014, 21:05
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Ach I forgot to weigh them! Tomorrow.
wandrson
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Posts: 23
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Post Re: Estimating Counter weight needed
on: June 10, 2014, 21:10
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FYI,

My first prototype, shown in another thread, has a fully assembled gondola (servo and pen) that weighs just under 400g. It still seems to be working mechanically with the 150 g counterweights you talked about...
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