Neiko 10649A 1/8-Inch Pencil Type Micro Air Die Grinder, 54000 RPM High-Speed Rotary Tool - Perfect for Metal Engraving, Wood Carving & DIY Crafts

Oiling it is tricky, it heated up before I did now stays cool. Doesn't seem to use much air, but then again I have a 5 horse compressorFOr the cost, this thing is awesome. Especially when used with high flow fittings or direct attachment to the pneumatic source.I'm currently doing light engraving work in aluminium and stainless (304), and deburring. It works fine for those purposes, but for engraving control at higher speeds is non-existant so don't expect to use it for that.My biggest gripes are that:- for an air tool, it gets *hot.* Normally I expect to see exhaust used to help cool units, but since exhaust is ducted out the back I'm guessing it doesn't have enough flow around the chassis.- The ducted exhaust out the back happens in the space between the intake hose and the plastic tubing that comes from the body. This tubing is just friction fit and has come off when in use, which will blast air on the operator. Whilst not typically harmful to the operator, it's liable to make someone screw up what they're working on when it jerks. I'd put a hose clamp on it.- the speed adjustment is not granular and unmarked. Nor a huge deal once you get a feel for it.- As some have noted, expect to need new tooling as it's a smaller 3mm chuck.Again, for the cost of this thing I'm fine sticking a hose clamp on it.First u have to oil it! Every day you use it! It is not a turbine grinder it is a pencil grinder! Turbine grinders run dry oil will slow them.. pencil grinders will get hot in hand if not oiled from friction. They will gal and loose rpm permenatly! Dont use a moisture trap u have to oil it! Second if tool or burr runout is so paramount u cant have a .001" runout u need to have as little bit sticking out as possible if it is not solid carbide or the bit itself can bend and cause vibrations from the speeds. For $40 u will not find a better option. In fact under $175 u wont! This one is better than the blue astro brand because if the hose is cut or burned it can be cut and re installed. The astro is crimped and much more difficult to repair. We use these on hardened die steel daily. Very good but our mind carbide bits spin tru. If u have issues try to re install in the collet at a proper amount of torque. Alternatives are $600 dynabride turbine grinders that run even faster but when u add pressure to the cut they lose speed. Not only that they break doen easy i could see buying one but our shop has about 10 in parts all broke over time. We reused parts from old ones as long as we could. These little pencil grinders can do 98% of yhe jobs. They are really amazing. So often we have to weld and rework the hardened steel in very confined areas no angle grinder could fit. These do the job and do it great. At about 3 hours use per week they last 12-18 months. They still work but are slower. They could be takem apart and renewed with new parts but for $40 why.. the parts will cost over half that alone..Saw this used and figured I'd save a few bucks. Looks good so far but I couldn't use it because they didnt send the wrenches to tighten the collet.Super value and easy. It is running 50k so don't think your normal Dremel cutters are going to work. They will come apart and hurt you! If you stay within safety limits this is a great item!I bought this as a cheap "beta" test to see if a pencil grinder would be a better fit for my gunsmithing needs (it is). Out of the box, it performed great. Max RPM is closer to 40,000, but that wasn't an issue for me. After about a month the upper portion began to continually come loose from the lower portion. Tightening the two caused the rotary collar/switch to seize up. Keeping them loose allowed air to leak at the collar/switch. I dealt with the leak for about a week and then the upper section of the body fractured through-and-through, around 3/4 of its circumference, rendering it unusable. Now I'll invest in a better quality model that will last.I did a lot of research before buying this item as I have a dermmel tool and wanted to use their accessories. It sounded like it might but there are many reviews which made me question it? As it turned out mine accepts them with the exception of the cutoff arbor that holds grinding disks, it was a little larger and the collet won’t open enough to fit, so for my review yes it accepts dremmel products.My second concern was would it be powerful enough to be useful? Again it met my expectations, I bought mine primarily for polishing but have used it for grinding jobs and it works better than expected, It has more power than my dremmel tool. I power mine with a 5 hp Craftsman 15 gallon portable air compressor.If the collet had a little more adjustability I would have given it 5 stars. So my opinion is you can buy this with confidence, and I would recommend it to a friend.I normally do not take the time to review a product since there are many reviews already but this item is worth a review. I restore carburetors for Porsche cars and after machining operations are completed on the aluminum bodies I soften the sharp edges by hand using manual deburring tools, scrapers and files. This is rather tedious and it is also a bit hard on the hands and elbows. I thought that trying this pencil sized die grinder would be worth the price and in spite of some of the negative reviews I bought one.Short story: Works like a champ! Smooth running and seems to be well made. I use a flow control valve to adjust total air flow to the tool to slow it down a little and with a carbide bit installed it makes my deburring job a lot easier! I do wear ear protection since it does make a high pitched racket which I happily accept for the improvement in my work.I do not have a comment regarding longevity or how robust the grinder is. It does run smoothly and there are no run-out issues like other users have reported.This works very well. Lots of power. Would be nice if 2 different size collets were provided as I had to buy one for different size shanks.UPDATE: Worked well to begin with. I had only used it 3-4 times and always made sure to use the air tool oil. Now after a few months of non use I went to use the other day and it would not work at all. Getting air but would not work. Of course it's outside the return window. Buyer beware. I would suggest spending the money to buy a good die grinder.The unit did not work out of the box.I’m a pretty handy guy so I figured I would try to make it work, so I totally disassembled it found a damaged seal inside which I replaced now it works as it should. So my suggestion would be better quality control.This is identical to the Astro which costs more. Made in Taiwan. Works very well so far. Smooth and speed control is very good. The other reviews of the Astro lead me to believe it will last a long time. Excellent product for the money. With good Burrs it trims metal with great control. Much more versatile than a Dremel.Used air discharge away from operator good feature.Collet was .119 instead of .125 had to mill it out with a endmill before it was useable, because it is heat treated....not recommended for others