RATTMMOTOR CNC 500W Spindle Motor ER11 500 Watt Air Cooled Spindle Motor 52mm DC 48V 12000RPM 600mN.m for DIY Mini CNC Router Engraver Milling Machine

UPDATE 4/16/2024:The first "R" photo was cut yesterday, out of white abalone (Korean Awabi), for a guitar inlay. I cut inlays for other luthiers, as well as design. This R is 3/8" tall. I've done nothing with it except cut it using this spindle motor, and I've dusted it off. The motor does a very nice job. I've run it to cut and slot a fretboard, which took almost an hour. The motor never got hot and was only lukewarm towards the bottom. I ran it at 12,000 rpm, which is the max speed.I'm not sure why others complain of overheating. Perhaps their programs are running it too fast, I don't know. But, this motor shows no discernable runout. If there was runout, this letter wouldn't look this good. I chose the capital R, because it's delicate and hard to cut.The last photo is of the same R, cut with cnc before I expanded the table. It was cut with my old 500w spindle. You can clearly see the difference.For your cnc to cut this well, you must address any backlash or instability in ALL axis and in the machine, before the spindle can work this well. But, as you can clearly see, the spindle cuts very nicely.I've just expanded my cnc so that i have a 24 inch + cutting length. I already had a 500w spindle motor. I'm striving for precision, not raw power. I need to cbc fretboards, bridges, and acoustic guitar necks. I also design and inlay custom fretboards for my custom guitars, and other luthiers. I've always done this work entirely by hand. I want to do more by cnc. The cnc will never replace my hand work, but it would be nice to get certain things done so I can concentrate more on the finer points of building, repairing, and restoring historical acoustic guitars.A 500w motor is equal to 2/3hp, which is pretty strong. I deal mostly with very hard woods, like ebony and rosewood. I've never had a 500w spindle slow down. I've used 1/4" end mills and 1/8" shank bits with the same results. My rule of thumb is to never cut deeper than 1/2 the size of the bit. I rarely go faster than 20 ipm feedrate. I don't break bits very often, even 1/2mm bits.I'm not in a race. It may take me twice as long as someone with a 3hp motor, but the end result will be the same, if not better, because of precision.The difference between this motor and my other 500w Rattmotor spindle is in the spindle shank. There's no grub screws in the shank. That means that either the shank/ER11 chuck is in one single piece, or the chuck/collet holder is screwed to the shank. Either way, there's no grub screws to loosen, get lost, or to cause runout. I've looked for this feature.The first thing I noticed was that the motor was a tad shorter. It's also lighter weight than my other motor. I mounted the motor, hooked it up, turned it on. I have a 200mm z-axis actuator that rides a 16mm ballscrew. My stepper is a nema 23, low current, high torque motor. The axis is capable of lifting and holding over 50 pounds.I've found that if you want precision, then the machine must be extremely rigid. You don't need the horsepower, but you absolutely need rigidity. So, I've over-built the cnc for this reason.After installing it, I brought up an engraving program to try it out. It's extremely quiet, and balanced. There's no vibration whatsoever. But the fan is enough to air condition my shop! You hear the fan blowing. It's not loud or annoying, but very strong. It blew away all dust and chipsI ran the 1" circle and square test, then an engraving.The largest letter R in the engraving is 0.25" high. If there is a vibration in a motor, runout, backlash, any deviation, the centers of the letters a, e, o, d, get destroyed. These areas are tiny. I'm using a 1/2 mm, 2 flute, end mill. Any deviation will break the bit. The engraving is 1mm deep. The spindle is running at 12,000 rpm's and the feedrate is 14 ipm, in Gabon ebony. With the tiny bit, It took 4 passes per letter to cut them.My other 500w spindle, from the same maker, doesn't have nearly that much air. I've never had a problem with the spindle heating up. The new spindle didn't get warm. It got a little lukewarm on the bottom, towards the shank, and was downright cold on the upper 2/3, after running at 12k rpm's for 40+ minutes straight. I need to calibrate all axis' tomorrow, but the motor is impressive.I'll update with more photos and tests.

This worked well until it didn’t. Broke down after 40 hours of use

This 500w Spindle performs exceptionally well when it has an independant PSU. It operates rather quietly and has remarkable torque. It's a great value for the money. I reccommend this spindle.

I understood to be careful when tightening to the aluminum bracket as to not break a magnet, while tightening I heard a magnet snap... I can hear bits knocking around when I start it up.I do not believe I overtightened it as it had just started to give resistance when it snapped and I have changed out a few spindles thus far that didn't break magnets at greater tensions than I had this one to when it broke.Aside from that the spindle is as expected, would provide a better review if not for the delicate build resulting in damage.

So far I haven't done more than test run it, the motor itself seems to be OK quality but the ER-16 collet that came with is pretty terrible. The collet is distorted enough that the ID is oval by 1-2 mm. It came with chips stuck in the slits, and the slits aren't uniform - one looks like they turned it a bit and did a second pass at half depth. And on top of all that, either the ID wasn't ground, or it was ground before heat treat.I thought I was getting a good deal given the sub-$20 price, but I can't really test it using the collet that came with it. I could probably 3d-print a collet that's better xD

I just received this 500w spindle, and tested it. It runs very smoothly, and no vibration. Very quiet with no load.

Had for only 6 months of weekly usage. Motor now will not spin with voltage applied. Before it stopped spinning it got noticeably noisier, which I attribute to bad bearings.

Swapped this unit for the 300w 48v spindle that came with the Vevor 3040 CNC machine. One for one swap. Just had to wire it in. Worked perfectly. Noticeable difference. Great upgrade!