MOMODA 1/4" Mini Air Die Grinder Kit Right Angle 90 Degree Pneumatic Sander 20,000RPM High-power Model with 1/4"(6MM) and 1/8"(3MM) Collets for Grinding, Polishing and More

In the interest of full disclosure, as a trusted and unbiased Amazon reviewer, I was able to request this product free of charge.So, this seems like a decent tool although the accessories are not so good. The grinding wheels are useless, the shafts are not placed squarely and there is a very significant amount of wobble. The air hose adapter is not brass and it leaks, but this is easily replaceable. The sanding disk seems OK and comes with a variety of sandpaper. There are 2 wrenches included - one for holding the shaft and the other for tightening the collet. Having both 1/4- and 1/8-inch collets is a nice feature.The collets are very tight - it is really difficult to insert a 1/8 shaft into the collet. Maybe this is something that will loosen up over time, I don't know.In operation there is a significant amount of oil spray exiting from the tool. I have only used nail guns of all sizes and the amount of required air is very small in comparison. So the oil spray may be normal. I don't know if there was any oil in the grinder originally, but I only placed 4 drops of oil into it before using.And now the best for last... the most significant thing to realize is that you need a fairly significant compressor to be able to use this tool. I have 2.6 cfm compressor which is more than enough for the largest nail gun, but this tool uses an average of 4 cfm. My compressor can't sustain the required 90 psi except if I'm doing short bursts. I don't think that is how the tool is normally used. So unfortunately, my testing is a bit limited; however, the tool seems to run true and does what it is supposed to do.The minimum recommended hose size is 3/8, recommended pressure is 90psi, and the recommended oil viscosity is 10W. You will not find mention of the 10W oil with the spec sheet that comes with the tool, although this is indicated in the Amazon description.So before ordering make sure your compressor is up to the task.

A nice little air grinder.Many uses for grinding, cutoff and some polishing.Hard to beat air tools.Simple maintenance and most air tools may last a lifetime.

MOMODA 1/4" Mini Air Die Grinder Kit Right Angle 90 Degree Pneumatic SanderThe Momada mini air die grinder works as advertised. It is a nice compact unit and has a decent rubber type case where you hold the tool. This is an improvement over a metal case. The tool assortment that comes with the tool are okay, but not over the top in quality. The sandpaper attachment is very good and holds good. The rear exhaust is also better than a front exhaust system. Just make sure you have an adequate air compressor to power this tool. It requires 90 PSI and most small compressors can’t keep up. Overall, a good die grinder kit from Momoda.

This MOMODA right angle die grinder certainly “works,” but it has some significant issues that make it potentially annoying to use.On arrival, I installed the supplied air hose coupler fitting, added some lubricating oil, and connected it to my air hose. Depressing the trigger, which has no safety lock, the unit immediately sprung into rotation at an easily controllable speed depending on how far the trigger paddle was depressed. As is typical for these kinds of air powered tools, the combination of turbine whine and exhaust air is quite loud.But, in addition to the usual noises, I found the gears in the right angle head to be contributing to the overall sound. They seemed to have a bit of extra play making the audible. I noticed a grease fitting on the side of the gearcase, so I carefully injected some molybdenum disulfide grease into it. Spinning the tool again, I found the grease to be largely slung out of the space between the output shaft and the housing, indicating that there is no seal at the front of the output shaft to retain grease or to prevent dust or dirt intrusion to the bevel gears.When I attempted to insert the first accessory tool into the ¼” collet, it offered considerable resistance, despite my having loosened the locking collar a number of turns. Unable to insert the tool, I removed the locking collar and found the collet tightly wedged into the drive shaft end. Extracting it with pliers, I found both the tapered back of the collet and the matching drive shaft receptacle to have a somewhat rough surface, so that once the collet was inserted and pulled tight, it stuck in place and would not release when the lock collar was loosened. I had to use some abrasive grease to smooth both surfaces and then clean and lubricate the tapered faces before I could get the collet to release on demand. Even after that, I had to remove the collet one more time and slightly spread its 4 jaws before it would allow inserting the accessory tool shaft.After the above repair, the tool was found to perform adequately and with sufficient torque to be effective. It is especially helpful that it comes with a second collet for 1/8” “Dremel” tool bits and accessories. This widens the scope of its usefulness. The 1/8” collect fit tools and worked better than the ¼” one, although some smoothing of its back taper helped it release also.The tool comes with a nice assortment of grinding stones and a hook-and-loop sanding pad, a mandrel, and some sanding disks. The sanding pad says it is limited to 15K RPM, but the tool is advertised to spin at 20K RPM, so wear protective clothing and eye protection. The quality of these accessories is workable, but not exceptional. The description page says the tool is “wrapped in soft leather cases”, and I assure you, it is not. It has an orange rubber (possibly silicone) cover.Overall fit and finish of the tool is lower end, and the trouble I had making the ¼” collet work to accept tools causes me to downgrade the rating by a couple of stars. But, once I got it working, it spins fast, has trigger speed control as well as a crude built-in speed regulator on the side, and performs the intended job. An exploded view diagram was included in the box but no instructions or website information. A card with an email address is provided though, to contact the distributor.

This 90 Deg die grinder comes with a lot of grinding accessories and a special wheel attachment for round sandpaper disk. The rubber jacket helps to improve your grip and prevents your hands from freezing when the grinder body gets cold from extended use. The 90 degree gearbox is very tight with no side-by-side play.My Harbor Freight angle die grinder is about two inches smaller in overall length than the Momoda unit. The Harbor Freight unit has bare metal and gets quite cold when using it for extended periods. The Harbor Freight unit has forward exhaust which will blow the work dust around and due to that venting design, that also means the 90 degree gearbox has a lot of play. One note, the Momoda does not have a trigger safety latch.