Genmitsu GS-775M 20000RPM 775 CNC Spindle Motor with 5mm ER11 Collet Set, CNC 3018 Upgraded Accessories, DC 24V, High Power, Noise Suppression, Electrical DC Motor for 3018 CNC Router Machine

First thing I did was measure the runout. I put the motor in a vise and placed a dial indicator on the side of the collet holder (without the collet cap). Rotating by hand, the total runout is .001". This is very good. The collet holder is glued onto the motor shaft. I suspect this is because they tweak the thing until it's true. I'll bet this is why they give you a holder with the motor. You are purchasing a system. I would recommend that you never remove the holder because it'll never go back on straight. Went to install it on my cheapo 3018 and it wouldn't fit. There is a metal band on the motor, presumably so it will fit larger machines. The band simply snaps off, which allowed the motor to fit into the Z-axis bracket just fine. The diameter of the motor, without the band, is 1.65" I read all the reviews about ramping up the motor, but just for fun, I simply turned it on at full speed with the Candle interface. The motor came on without any issues. However, just for good measure, I will put the ramp-up code into the header section of the gcode generator so it's always there for all NC program files. The motor is very loud, but not because it's unbalanced or out of round. It runs at 20K RPM, so I would expect it to be loud. It isn't any louder than my Craftsman wood router. I was hesitant to purchase this motor, but since Amazon has a decent return policy, I decided to risk it. So far, I'm pleased.

Although I haven't had this for long, I felt compelled to write this. I have a TT 3018. The first few cuts I made in wood were disastrous. Basically, the ER11 coupler that came with it keep moving. I tried fixing it but found out that the motor shaft was 4.89mm and the coupler hole was 5.25mm. Horrible vibration and it eventually fell out while cutting. I decided to buy this item since it advertised 20000 RPM and folks had good like with it's balance. The motor installed in the 3018 without an issue. Turning it on, without any cutting proved to be much more quite that the stock motor/coupler, indicating good balance. I also have a handheld RPM meter, bought here on Amazon: https://www.amazon.com/dp/B07Q6M95PF Which I used to verify max RPM. It got 19800 no problem. I was able to also see 20700 but good enough. I also tested a few different motor speed settings, which showed that my cheap controller can get different speeds out of this motor. $30 set to 20000 Hope this long table helps Setting: RPM S100M3 3200 S200M3 8000 S300M3 12000 S400M3 14600 S500M3 16000 S600M3 17700 S700M3 18500 S800M3 18500 S900M3 19700 This speed stuff is not exact but I'm happy to see that I can set different speeds if needed. Original motor supported 8000RPM max. I also did a 90mm x 100mm x 12m (depth) carving using 1/8 end mill and a v-bit at max RPM. Took about 3 hours. This motor cut through just fine. No over heating, not excess vibration, no stalls. For $25, throw out the original motor and get this.

Spindle gives excellent performance compared to the stock 10k. Has alot more power and the extra rpm allows you to run higher feeds and speeds. Alot less likely to chatter with the small bits hogging out materials. My first test was on 1/2" birch plywood running 20k rpm 30in/min feed 9in/min plunge and 0.028" depth per pass and it flew through like a hot knife through butter. That being said this is my second spindle the first one was so out of balance it was super loud and shook the machine like crazy compared to the stock spindle which was nearly silent. I put in for an exchange and the second spindle I received runs perfect just like the 10k but much better performance. Don't settle for one that is loud and shakes they aren't supposed to.

I put this into a 3018 frame with a 24v/40A power supply ... It will never see 20k rpm, 1/10 of that, cutting pcbs

This was a great upgrade to my 3018 pro. I upgraded the y axis and this spindle together and now I have a machine I can actually use to do bigger projects. It is considerably louder than the old one but no more than I expected, after all it is twice the RPM. First carve with it was 4 hours and it preformed fantastic. Much cleaner results. There is a slight vibration at around 14,000 to 15,000 rpm but nothing terrible. I will just avoid running it at those speeds. For the price it out preformed my expectations.

The 20k spindle is a very good upgrade to the base spindle that comes with the 3018-PROVer. You do have to either get a stronger power supply or ramp up the spindle speed properly, which is what I do, but otherwise it is a very quick and easy swap. This spindle cuts much faster, cutting my times by about 30%. One minor word of warning - running a CNC is never quiet, but this spindle is much louder than the original. What really puts this spindle over the top for me is the outstanding customer service I’ve received. My spindle started sparking internally, possibly from the brushes wearing out, after six months of pretty hard use, and when I reached out to SainSmart support, they immediately replaced it for me. They have been incredibly helpful every time I’ve had a question or an issue. I can’t rate their support here, but it would definitely get five stars too!

As another reviewer stated, the collet nut provided with this is absolutely terribly machined. There is an internal band that is machined so far off center the collet cannot connect to the machined surface in the nut. I actually noticed this problem with original nut supplied with my 3018-PROver. That one was not quite as bad so is somewhat usable for some rough work, etc. First picture is the nut provided. Second is the one that came with my original machine. The 3rd is both and you can see the old one on the left doesn't quite contact, but you can see the one on the right (the new one) doesn't even come close. Have contacted Genmitsu; will update if I hear from them.

Upgrade to the standard and works well

Bem melhor que o spindle original

goede balans, zo goed als geen trillingen zeer tevreden over de kwaliteit

Comparé à la broche d'origine qui peine à 8.000 tr/m, là on a vraiment les 20.000 annoncés (mesuré). Pour l'alimentation électrique nécessaire au démarrage de la broche il faut max 4A (mesuré) ensuite à fond elle stabilise à environ 1.5A . Si votre alim fait au moins 5A pas de soucis sinon suivez les préco du démarrage progressif en 2 ou 3 paliers (commandes G-code). Le points négatif, il y en a 1 seul vraiment pour l'instant c'est le bruit, mais bon à cette vitesse. Pour le prix ne pas hésiter, ca change la vie et la qualité du fraisage.

If youre like me and upgrading the spindle on your cnc, youll probably be recommended this a lot, and honestly theres a reason for that, the standard motor on the cnc is 7k RPM, this is 20K and so a major improvement, if you want to feel the full effects of that, this will need its own power supply as it takes a fair bit, but it can still be ran at speed without just having less torque to it, the nut and collet provided is alright quality but safe yourself the hastle and buy one of each individually, youre buying a spindle, not those parts and so may be slightly off and make noise, which is why Ive given it a 4/5 on accuracy, as the vibration from that makes it majorly louder, as well as the added speed of course, but still having this spindle at such a low price has made milling softer materials so so much easier and better, with it even milling aluminium at a push (this is all without its own power supply like I said). So overall this spindle will get your job done, and done well at that, it is still a budget spindle, but is a damn good one and I totally recommend it.