Hi fellow reprapers, I would like to ask question…
I am thinking about making worm-screw based extruder (I should be able to make worm-wheel on lathe with screw-cutting tools, so for DIY should be enough)
and there is one thing about worm-screws, they got big gear ratio, like 1:40? which seems fine because you can make extruder with ridiculous strenght.
But I was wondering, what is maximal speed i should be able to achieve with Nema17 (2.5A) and reprap’s stepstick ? have somebody every really stressed it to it’s maximum in terms of speed?
I mean, it would be pointless to got such a big strength with pulling with really slow speeds…
Of course I can compesat for gear ratio with making gear that pushes material bigger (again, possible for me on lathe), but actually calculations said that to get 1000steps/mm (which just doubles my actual settings), my pushing gear should be 3 times bigger than worm-wheel (which is too big to be practical)(P.S: assuming that pitch on the worm-wheel would be 1mm)
question is, what is maximum steps/mm for me to be able to work?