If you want to splurge a little, Mike, get a Hitachi VFD. They produce far less electrical noise than the Huanyang and have much larger internal components. Plus, you can call Drives Warehouse in Dallas and talk to the guys who are very knowledgeable on setting these up, great support (that's also where I bough ours).
There are a lot of folks who have used the Huanyang for years without issues, though. I just preferred to get the better VFD for ours.
Okay, now David is introducing me to new variables! Since you have been in a career involving this type of electrical components previously, I'm interested. The VFD drives the spindle by basically converting single phase power to three phase (is that correct?) so the better quality of VFD could reduce electrical noise which I am assuming creates a more stable, smooth running motor in the spindle. From the electromagnetic properties of a motor, three phase is more true than using other single phase units. Now I am getting outside my expertise. Induction, magnetic fields, current and waveforms are stretching into the boundary of my knowledge base.
Does the electrical noise affect the RPM of the motor only or does it potentially transfer into the drive systems, ie: stepper motors or whatever control systems for the x,y and z axis placement?
Now I've got an idea, you guys that have accumulated all this knowledge should band together and write a book, even in PDF format, so folks like me can learn! You could sell it to us newbies and we'd not pester you guys to death!
I like to know the ins and outs and what makes a gizmo work versus just knowing that I can connect two pieces of equipment together and they will work!
As a kid, way before they had internet and google, I'd take things apart to find out how they worked and the put them back together. I admit that I destroyed a few things, but I learned! Sometimes I'd get in real trouble over destroying Mom's kitchen gizmo.
Curious minds want to know!
THANKS! I really appreciate it.
PS - I put my Avitar to match up with all my questions!