Is This A Scam? $1000 AliExpress ATC CNC Spindle Review
$1000 Lusintun AliExpress ATC CNC spindle — was it a scam, or not?
🏆 Also featured on Hackaday.
https://www.youtube.com/watch?v=SzJyBM78uRQ
Introduction — my cheap Lusintun ATC CNC spindle
Several months ago I was looking for a spindle for my upcoming CNC machine. I had been drooling at a cheap BT30 ATC CNC spindle for a while. And I decided that it was finally time to take the plunge.
I found a few options on AliExpress, but they were all quite expensive. So I kept looking and eventually found a cheap ATC spindle that was in my price range. Initially I was planning using it on my DIY PrintNC metal CNC router build — but later on I decided to proceed with my own design, the MightyMill.
It is quite nerve-wracking buying a $1,000 ATC CNC spindle which — to you — is unproven, especially on AliExpress. But I took the gamble.
4-pole vs 8-pole motor — which one to buy?
I made a graph of the torque vs RPM for the 4-pole and 8-pole equivalents, based on the information provided by Lusintun. Based on my intended usage (aluminium, plastics, and steel milling) the 8-pole was more fitting.
For reference: a regular 2-pole 80 mm spindle has around 0.68 Nm peak torque at ~18,000 RPM. The 8-pole Lusintun gets you real torque in the cutting range, not just high idle RPM.
Inspecting the cheap ATC spindle motor
The spindle arrived a few weeks later and I have to say that I am very impressed! It was very well packed. I have never had anything from AliExpress come in such well prepared and professional packaging. Unpacking it and inspecting the spindle itself — it seems very well made.
Initial issues
Here it comes…
The VFD was set up directly from the factory so it was plug and play. The issues that I had were related to the NBT30 tool holders that were provided by the seller. Every time I ran them above 8,000–10,000 RPM on my ATC spindle I felt and heard serious vibrations coming from the tool into the machine. SHIT! It was time to investigate.
Runout measurements
To make sure the issue was not related to the spindle having excessive runout, I purchased a Mitutoyo 2 µm dial / test indicator to verify the supplier’s specification of < 0.001 mm runout of the spindle cone.
The needle basically did not move. The spindle met the < 0.001 mm runout specification with ease. So the spindle itself is fine — the problem is downstream.
Vibration measurements
After contacting the seller on AliExpress, they assisted me well in measuring and validating that the spindle is not the issue. In order to measure this properly I needed some extra gear — enter the SNDWAY SW-65A handheld vibration meter.
In my case, no. The Lusintun BT30 spindle I bought was legitimate — well packaged, runout under 0.001 mm on a Mitutoyo indicator, VFD working out of the box. The catch was the tool holders bundled with it — those were the real problem, not the spindle itself.
Depends on what you’re cutting. For aluminium, plastics, and steel milling the 8-pole gives you more usable torque in the cutting range. If you only cut soft materials at high RPM, the 4-pole can make sense. For context, a regular 2-pole 80 mm spindle has about 0.68 Nm peak torque at ~18,000 RPM.
In my case, not the spindle — it was the NBT30 tool holders supplied by the seller. Measured on a SNDWAY SW-65A vibration meter, the tool holders showed a 6× vibration spread and the ER32 nuts a 20× spread. The motor itself was clean.
A dial or test indicator with enough resolution — I used a Mitutoyo 2 µm indicator. Clamp the indicator to something stiff, touch the tip to the spindle cone or a calibrated test bar, and slowly rotate the spindle by hand. Anything under 0.01 mm is reasonable for a hobby-grade setup; a quality BT30 should read well under 0.001 mm.
“Safe” depends on the seller. I’d do the same homework every time: read every review, ask the seller for measurement data before buying, and as soon as it arrives, verify runout and vibration yourself before cutting anything valuable. The Lusintun spindle I bought held up to that process; your mileage may vary by brand.
Yes — the review was picked up by Hackaday, which is why the post got as much attention as it did. If you came here from there: welcome, and the rest of the MightyMill build is worth a look too.
Thinking about an AliExpress ATC spindle? Ask in the Discord before you pull the trigger — happy to share the exact model and my current take on it.
