Centroid Community CNC Support Forum

Hi everyone. Is there anyone here who can share their opinion on Jianken spindles after using them for a while—not brand new ones?

I'm currently considering one as a replacement for an ELTE 3.3 kW MTC, but there are a few things I’ve seen on their website that leave me (very) puzzled:

1) For the JGL-100 2.3 kW 24,000 RPM 400 Hz 2-pole 220 Volt model, there’s a kind of chart showing frequency on the X-axis and… "Voltage" on the Y-axis. What’s that supposed to mean?? What’s the point of plotting voltage against frequency like that?

2) Under the specs, Jianken lists the current draw at 220V as 8.8A. They don’t specify whether that’s S1 or S6 duty cycle, but even so, it doesn’t add up. If they’re claiming 3200W at 220V AC, shouldn’t the current be more like 15–16A at a minimum? Or am I missing something here?

3) As for the connections: okay, I get that the motor terminals (U/V/W + ground) are directly exposed without any connector. But for a 3200W spindle, the wire gauge looks way too thin. Just by eye, I’d say it’s something like 16 - 18 AWG, which seems pretty undersized for that kind of power.

Where I’m from, they say "three clues make a case."
So—is there anyone who can comment or provide more info? Even better, a review after a decent amount of real-world use?

Thanks, folks!

Hello,

I don't have hands on experience with these spindles but from what I can see on their website:

1) That chart is the V/F curve and is probably most useful for setting the Field Weakening Point in the VFD parameters, if available.

2) The ratings might be a question of peak vs continuous. It is probably best to reach out to them for clarification on that. Also, there seems to be a 2.5 kW and a 3.2 kW version of the JGL-100 spindle.

3) Wire ampacity is determined by the insulation as well as conductor cross-sectional area. It might be that they have a high temperature insulation for those conductors. Again, probably not a bad thing to ask them about.

Great spindles. I have been running one for about 6 years. 80mm, 30k 2.2kw version. 2 pole.

I then ordered a 4 pole, 24k spindle to have lower torque on another machine. Lots of guys were running these.