Jason Burton wrote: > > Hall effect sensors >> assuming straight contact closures here, not active > signals, right? > Well, the typical real Hall sensor in the motor needs +5 V, but is often like a contact closure to ground. So, the Hall sensor package has 5 wires, +5, Ground and 3 signal wires. > I am at a decision fork. > 1) Spend money and time on this hardware, get better performance. Or > 2) Sell this and build my own repstrap like version run by with steppers > and linuxcnc. > > Well, brushless servos have WAY more performance than steppers. Although, in the repstrap size machine, it may not make a whole lot of difference. > I intend to put a flame cutting head on it for small format steel sheet and > plate. > > Hmm, I can't imagine a repstrap with a torch on it. > With a head swap and sitting on top of a Z stage I want to experiment with > liquid binder based 3D powder prints. > > I already have steppers, several drivers, acme leadscrews. It just seemed > tantalizing having the complete xy built already minus the control. > > Don't really want to put $300+ into an experimentation platform that ends > up slower than what i could build from my "junk" box. > Well, probably won't be slower. I think your motors were rated to 3000 RPM at ~200 V, so I'm guessing you'd get about 1800 RPM with my servo amps. 1800 RPM with a 20 TPI leadscrew would give 90 IPM, but if the leadscrew had slower pitch, you could get 360 IPM at 5 TPI, for instance. Not sure you can actually spin a thin leadscrew at 1800 RPM without bending it, so the motor may not be the limiting factor.
You certainly cannot get 1800 RPM with most stepper motors, they will severely overheat at sustained speeds over 1000 RPM. Jon ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
