I’m about to purchase an 80mm spindle for my 1f…which I won’t have for 6 more weeks. I see the rpm is 8-24k, but I have seen them running MUCH slower than 8k. Is it just free spinning with no torque below 8k?
Correct, it’s impractical to run our 2 pole motors less than that, but i would modify that range to be 12k-24k
Just impractical? Or is it somehow harmful to the spindle? The reason I ask is that a majority of my work can be done in the 6-10k rpm range. 15k+ is WILDLY excessive for most of what I will be doing. Not a big deal, just a curiosity.
Running it that slow wouldn’t be harmful for the spindle, but we predominately sell woodworking spindles, which operate the ~12k+ range with an emphasis around 18k.
Perhaps one of our 4 pole 800hz metalworking spindles would suit your needs more since they have higher torque at lower rpms as you’re like to encounter stalls in the 6-10k range.
I’m curious, what are you doing that requires such a low rpm where 15k is wildly excessive?
Typically light duty engraving and fine 3d pencil milling in hdpe, aluminum, nylon etc. with 1/16-1/4" ball tooling. As well as a variety of small aluminum parts minus drilling and tapping. I find that I get some melting and “hairy” finishes in hdpe especially with high rpm’s. I won’t have the benefit of running flood coolant here at home as I do at my day job. This spindle will be for a onefinity elite. I was unaware there was a metalworking spindle option available. I guess my next dumb question would be…If I purchase a metalworking spindle also, would I be able to swap it out when needed? Or would the metalworking spindle need it’s own vfd? Please pardon my ignorance of electronics 
What would the rpm range be on the metalworking spindle?
On the 1F Forum, someone reported their workings with our metalworking spindle. They reported peak torque started at 9k rpm. That doesn’t mean you can’t run it slower. Would a regular spindle work, maybe, I can’t say for sure, but I wish this website said what hardwood it was comparing it to because there’s a difference in janka between mesquite and red oak.
Can you swap out the motors, sure if you’d want to, however it’ll also require a programming change in the vfd settings. Could probably swap it out in about 20 min after you get into the flow of changing it. Our ATC motors are metalworking 4 pole motors so changing it out wouldn’t be necessary regardless.
I understand the need now to not have it as fast as we usually only cut through hdpe, and use an O flute but then go back and clean it up with a chamfer. I’m not saying it won’t, but depending on what you’re doing specifically you may need to bump the speed up. It can run at 8k, but it doesn’t have much torque (rpm holding power) at 8k, so passes would have to light to be successful, and if you experience stalls you’ll need to make adjustments.
This is very encouraging. The fact that I wouldn’t need a second vfd, and I could swap the spindles with a (presumably) simple change in settings, really widens my capabilities without breaking the bank! I see now that the 800hz spindles are a special order and have no price listed / “unavailable” My only questions now are how much is the 80mm 800hz? Can I use the same cables? And what is the low end rpm? Take my money please! 
Aircooled is unavailable because there is no air cooled 800 hz motor available.
The 80mm motors is h20 spindle cables
I don’t have a solid answer on low end rpm, as it relates to torque
Whoa! $2000…ok that changes everything! The other spindles (motor only) are in the $300 range and I assumed the metalworking spindle would be in that neighborhood. Damn. Ok well, I guess I’ll just have to experiment with how much torque is lost with the woodworking spindle at low rpm. I’m accustomed to running 40&50 taper machines at work so it’s hard for me to grasp how hard I could push a hobby cnc. I would be happy if I could run a 1/2" endmill through aluminum at .05" deep, 3-5k rpm. Or through mild steel at .01-.03 deep. That’s about as hard as I would ask the machine to work. I appreciate you taking the time for my silly questions sir.
2k is the atc motor. The 800hz metal working traditional spindle is like 650
Ah…now I see. I got excited for a moment till I realized the non atc motor is 220 only and that’s not an option for me 