Re: Grounded Experimental Delta Printer

@ShadowRam: If I print them solid (which I won't) the top pulleys will weight 40g each. However, I have not worked to optimize their size yet. I was trying to get a proof of concept down on paper so I could better think about the next steps.

Now that I am focusing on the torque needed, the design as is can produce up to 4N forces from each arm. A quick calculation shows that my Printrbot is producing more than 100N in the x and y directions. That is a huge difference for sure. I think I will take your advice and bump up to the Nema17. That change alone will bump up the force to 14N. However, the Nema17 weighs more than 2 times what the Nema14 does. (Not really an issue due to it being mounted close to an axis.) 14N per arm may be enough with such a small dynamic load. However, I will probably need to adjust the small pulley down and make the large pulley bigger. With what I consider small hard to notice changes, I can hit 24N per arm. (.75" x 4" changed to .5" x 4.5")

I estimate that the dynamic load will be around 200g. To accelerate 200g at 5g, I will only need a net force of 10N.

I think that settles it. Nema14 was wishful thinking.

EDIT: I made some math mistakes. I was doing some quick napkin calculations. All of the above numbers are gross estimates.