CNCTOPBAOS Rotational 4th Axis A axis Rotary Table,K11-100mm 3 Jaw Chuck Dividing Head,Gapless Harmonic Gearbox Reducer Ratio 50:1 w/ 65mm Tailstock for CNC Router Engraving Milling Machine

The first one I received had a ton of backlash and was really disappointing after reading the other reviews. While I was waiting for the replacement to arrive I decided to look inside and see what was wrong. When I removed the motor I found the two set screws on the motor shaft were loose so I tightened them, put it back together and measured this to only have 3 arc minutes of backlash. Happy with that I kept the original and sent the second one back unused. This didn't come with any directions so I had to go the internet for wiring the motor: A+ red, A- green, B+ yellow, B- blue. I have this running at 27500 degrees/minute which I think is pretty impressive considering the 50:1 reduction. To achieve that its running on 50 volts, at 2.84 peak amps. I really don't know if 50v is ok for this motor since there is no documentation with it, but that's what my system runs at so that's what its getting. My only other gripe is that this should really come with a 4 jaw chuck in stead of 3 since it will predominantly be used on routers.

Set up on my Queen Ant CNC using Mach3. As it was my first I did have a learning curve setting up the driver. Not an issue with this product but learningthe setup. I have recut items using a reference mark and the cuts are right on. I do fine details cutting pens and with a bit of a learning curve using a 6.2° TBN. They come out great. Very satisfied.

Excellent packaging and nice workmanship. The NEMA23 stepper at the end is open to the elements (coolant), and the flimsy cables are unprotected, both of which can either be accepted or fixed by adding a small enclosure that hides the stepper and cable nuts, plus an armored cable. Anyone with a use of a 4th axis can probably devise such an enclosure in an afternoon. the chuck is a standard low-cost CN-made 4" chuck. The electro-mechanical specs (stepper, gear ratio, and such) seemed to be the substantially the same as the 4" from TM, so I was hoping that, after configuring the DIP switches on TM's 4th axis integration kit appropriately for the TM 4" but lower current, and in PathPilot's UI selecting the 4" 4th axis option, it would work out of the box. It stepped just fine, but the angles were off by a bit. I had to adjust the SCALE value in the PathPilot 4th axis config file from 141.666666 (which, according to my math, would be appropriate for a 51:1 gear ratio) to 138.888888 (which is correct for a 1:50 gear ratio). If you don't know how to do that, google it in the LinuxCNC forums. If that's too much wizardy, then this product is probably not for you. The stepper is considerably less powerful than TM's NEMA34 stepper, but for my purpose--which can be best described as indexing rather than 4th axis continuous machining--it works just fine. I'm pretty sure there would be enough torque for light machining (maybe a 1/4" endmill and light cuts in AL). I haven't used the tailstock yet. For my first experiments, I put the whole thing into my 5" vise, which has just enough travel and was already properly aligned.

I bought this so I can use my clearpath motors with it. It states that the motor shaft is 6.35mm or .25 inches. This is not so. THerefor Could not swap out the motors. Who knows what other stats is wrong on this thing. im editing this review. After having this little unit for a while. I can tell you it works pretty damn good. there was a little miscommunication about the shaft at the beginning. But I can let that slide. I had to bore it to the size of my motor shaft with my drill press. and its been working very well. Im thinking of buying another one.

Works great. Smooth as silk with very little runout.