2013/8/6 Dave <[email protected]> > A lot of it depends on how much power you need from the motors..and how > fast do you want your machine to move. > Then also what happens if you lose position on a stepper?? > > Dave > > A well designed stepper system shouldn't loose steps, right? There are many metal working machines out there since decades with large old steppers that still runs, but they aren't fast. My steel router has small Nidec servo's running 5 m/min with no problem (with awesome acceleration), right now the computer is the threshold, I get errors if I speed up the threads. I need more outputs and a faster controller this time and it will be a Mesa card included for sure. The palette I'm going to use as a table is pretty heavy, and put a mould half on top of that. That's at least 100 kg moving parts, maybe more. And I want at least 5 m/min transport, the double would make me satisfied but that means too large motors and screws for the budget I think. Looking at the smaller "cheaper" machines like the Tormach they all have steppers - and a transport speed around half of my minimum requirement. I'm not sure that a stepper setup will make it, but still it's the half of the price even though I choose beefy motors. For me there's no learning curve in servo's, I'd rather say I have a learning curve when it comes to _steppers_. A five axis setup will not be cheap and this time there's a bottom in the money pocket.
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