KomeStone K1 Quiet Rock Tumbler Kit for Adults, Kids & Families

I end up with a lot of old hardware and small bits and pieces that come from garage sales, cannibalized equipment, etc. I also restore old tools, work on old cars and motorcycles, etc. I wanted a small tumbler so that I could drop a handful of fasteners or small parts in, let it run for a while, and come back to clean metal. This was a complete shot in the dark. I usually soak parts in vinegar or phosphoric acid when they're rusty, and that works well enough that I wasn't sure if tumbling would work better or be less hassle. On the one hand, there's no acid to neutralize and not much pre-cleaning that has to be done. On the other, you have to deal with abrasive grit, which can get everywhere (and I mean EVERYWHERE). Since I didn't know if I'd like this approach, I didn't want to risk a lot of money on a tumbler. I bought this kit because it was inexpensive and had decent reviews. If this ended up being an essential part of my workflow, I decided that I could always buy something bigger and/or better in the future. So far, this tumbler has been awesome. The first batch of parts that I threw in was a rusty mess of hardware that I'd picked up at a garage sale. This stuff probably hadn't seen the light of day in decades and had a pretty solid layer of rust on it. I skipped the included media and instead filled the tumbler drum with medium (70 grit) aluminum oxide, which is a pretty aggressive grit used for media blasting. I'm not a fan of membrane buttons or plastic construction on most things because I haven't found it to be particularly durable, and this tumbler has both. It certainly doesn't look heavy duty and I didn't expect much out of it. In reality, I didn't even think it would have the power to turn a drum that was chock-full of steel hardware and abrasive, but I gave it a shot. I was pleasantly surprised that the drum started turning effortlessly even at the highest speed. Most of the hardware had settled to one side so the load was imbalanced and the tumbler started to walk across my workbench, but I propped it in place with a heavy box and let it run. After about an hour I checked on the hardware and almost all the rust was gone. I dumped the contents of the drum through a strainer, which made separating the hardware a breeze. What was left was almost completely clean steel, certainly clean enough to use once I blew the last of the grit away with an air hose. I ran a few more handfuls of hardware through this machine with the same results. I also ran a really cheap set of rusty no-name sockets that I bought at (yet another) yard sale. I keep junk sockets around in case I need to modify them for odd sizes or special uses, and these followed me home to be added to the "just in case" pile. The sockets came out fairly clean. The chrome plating is peeling off and while the tumbler knocked off any rust and loose bits of plating, it didn't take everything down to bare metal. That's fine, however, because it did most of the dirty work for me while I was doing something else. I can always give one of these sacrificial sockets a once-over on the wire wheel if I need to weld or modify it, but at least I'm starting with something relatively clean and rust-free. If you tumble steel parts or hardware, just remember that what comes out will be prone to re-rusting pretty quickly. This is because you've abraded off any protective oxide layers that were on the metal. It's a good idea to blow off any remaining media and then oil the metal to protect it. Also be aware that touching the raw metal with bare skin can cause it to rust faster, as the salts and acids in your perspiration all cause oxidation. I usually wear nitrile gloves in the garage so this isn't much of a problem for me. When I pulled this dainty little thing out of the box, I figured it would be good for a couple of uses at best before the motor burned out or something broke. So far I'm pleasantly surprised. It's put in a few hours of work with no complaint and nothing broken, and it does a good job of removing light to moderate rust. The aluminum oxide is a worthwhile investment (I think I paid $20 for 25 pounds or so, and I could've gotten a way better deal if I'd shopped around). Long term durability is still a question of course so we'll see how that goes, but so far this thing punches above its weight.

This is the second tumbler I’ve bought from this brand and the quality is just as amazing as the first! It tumbles rocks super well and honestly everything that comes in the package is just top-notch for anyone getting into rock tumbling. My husband and I were complete noobs and we are surprised with the results we have achieved. And on top of that, their customer service is incredibleeee! super helpful and responsive whenever you need anything. Just get yours!!! You wont regret 🤩🪨💎 Love Komestone forever ✨

I’m very happy with this tumbler. It was easy to set up, the controls are straightforward, and it runs much quieter than I expected. I like being able to adjust the speed and number of days without having to babysit it. The rubber barrel feels sturdy, and the 2.5 lb capacity is a nice size for doing a decent batch without the machine taking up much space. The kit also comes with everything you need to get started, which was helpful since I was completely new to rock tumbling. It includes the different grits, ceramic media, strainer, rocks, extra belts, and even jewelry pieces. I especially liked that I could open the box and start without having to figure out what else I needed to buy first. I’m still working through my first set of rocks, but they’re progressing well and I’m excited to see how they look after the final polish.

I did a test run on this Rock Tumbler. I ran a 6-day cycle each on using Grits #1, #2 #3 and a 7-day cycle on the finish polishing Grit #4. The 1st photo is an example of how the rocks looked before doing the test run and the test run lasted 25 days total. I can tell that I needed to add more days of run time with the roughing grits, #1-#2, the semi-polishing grit #3 and probably the final polishing grit #4. This was just a test run on the tumbler using continuous run days and not getting the best quality results. This is a hobby that needs a lot of time to get quality results, the work involved is not very much it is the actual tumbling that is time consuming. I would recommend taking your time to run each cycle, check the rocks every day or two to see if the rocks are good enough to go to the next cycle. If you hurry, the results will not be satisfactory to you, and it will be a waste of tumbling grit, you will need to run the cycles again using more tumbling grit. This is a hobby, like anything will need time and experience to get great results. I believe this tumbler will last quite a while. The rocks I used for my test run were rocks that I picked up off the ground while camping last August in 2023. On the feedback, I like the 2-year warranty. I did request the manufacture to send me the free 5 extra belts and did receive them in the mail. The next things I want to comment on are items I noticed while doing the test run. The first thing I noticed was the rubber drum was the rubber getting rubbed/removed from the bevel on the bottom end of the drum. I don't think this will be a problem, it probably is just going to wear down to a certain point and then stop wearing down. The next item that I found was with the pulleys and belt that spins the drum. I found that when I wanted to just move the tumbler without lifting it and just sliding it, while it was running. I would almost grab it where the pulleys and belt were spinning and could see someone possibly getting some kind of injury or damaging the tumbler. I was surprised that there isn't a safety cover over the pulleys and belt, mainly because the manufacture list the age for using the product is 4 and up. I think this should have a safety cover over the belt and pulleys, it shouldn't be hard to have a removable cover that snaps into place. If I found that I almost always grabbed onto the tumbler, right where the pulleys and belt were spinning when I just wanted to slide the tumbler over a little, a 4-year-old probably wouldn't catch themselves before grabbing the tumbler where the belt and pulleys are located when running. I know the instructions say that you should always turn the tumbler off when moving it, but many or most people would do as I did, slide the tumbler over while it is running. I also see that the manufacture has an updated version of this tumbler available, it costs more, but it has a brushless motor. This motor should last longer that the motor in the model I purchased, that has a motor with brushes. I would give a rating of 5 stars on this except for the lack of a safety cover, especially for the younger children. I am leaving an overall rating of 4 stars, because of my only using the product for 25 days and don't know how long or how well it will work until I have more use time and get better at getting results that are satisfactory.

I’m retired and never used a tumbler before. This is a nice set for starting out. Very nice tumbler with settings/displays for both days and speed. The people selling it reached out and gave me a few extra belts as a bonus. I ran it for a month so far without any issues, so I’m probably well supplied with belts. The drum is tire material and helps with the noise which is comparable to AC. Best if you have an out of the “common area” room for it due to the sound. It comes with: 4 stages of tumbling grit (enough for one complete tumbling process); ceramic tumbling media (which works best after stage one) and a small bag of rough gems. After that, you’ll have to get more grit and gems. The ceramic media is reusable. Just need to clean things well when changing grits. I highly recommend finding someone good on YouTube to get tips from. I watched some from Michigan Rocks and he has some good tips. Have fun…

Ordered this about 3 months ago. Finished my first batch of all 4 steps this week. The pictures above show the results of my first attempt. I got some rocks with a really great shine. Many of the rocks I tumbled had white edges even though the face was smooth and shiny. Looking closely, the edges appear to have micro-pitting which I expect means I didn't provide enough cushion in the tumbler. I am very happy with my initial results, but it is clear that to get excellent results will require further experimentation. The tumbler worked without issue. I filled it about halfway and added the grit package and water. Some of the reviews indicated issues with the belt, but I didn't experience any issues with the actual tumbler, belt, or stand. I noticed that on speed 3, the stand did tend to vibrate around. I recommend two sided adhesive to keep it firmly in place. The tumbler didn't leak at all. The instructions were great! Provided guidelines for each step. The pictures of the rocks included as a samples were very nice. Also provided suggestions for some additional ingredients to experiment with. One suggestion is to in between each step after rinsing the rocks, add some dish soap and water and turn on speed 1 for 1-2 hours. This does a great job of cleaning the rocks in between the steps. This also helps after the polish to get a shinier polish. Inside the kit was a bonus gift if you contacted the support group. I did contact the support group and found them very responsive. They did send me 5 additional belts, although I have not yet needed to replace the original. Overall, the product seems high quality and able to last for many years of tumbling. Responsive support is available for the product if there are problems. The final results of the tumbling process can be very nice, but it is clear that the quality of the results rely upon the experience of the operator, rocks selected to tumble, ingredients to tumble in, and time and speed of the tumbler.

This has been the most fun ever!! I have toldl my children as many mothers and teachers have to not play with rocks or sticks but man I was wrong!!! I have autism and I was a bug rule follower as a child and I NEVER played with rocks. I see now from my oldest son who loves rocks that I missed out in a big way!!! We havde been gem mining with him and some friends and then bought these rock tumblers and they work so well!! We even had one of them get a stripped screw and they immediately shipped us a replacement part with no hassles whatsoever!! Thank you so much for bringing the child back in me and letting me get to do something I never did as a child now as a 53 year old woman!!! Rock on baby!!!

I’ve had this for a few weeks now and onto stage 2 of tumbling. So far it’s been solid and my wife and I are excited to see the final stages of the rocks we’re tumbling. Instructions are clear, kit came with everything you need to get started, and the customer service has been impressive so far! I would definitely recommend you consider this item if you’re getting into tumbling or replacing one. I purchased the dual drum kit and the large 22lb tumbler in addition to this. All are doing well so far! Can’t wait for the final stages of the polishing process.

This thing is pretty cool, my son really loves it. The included rocks seem like good value also, they're quite expensive to buy individually. Seems to run reliably for the 8 or so weeks of running we've put on it, and the kids are all searching for rocks to put in it now. Thank goodness for AI that I can identify all their rocks and which ones polish well together, what procedures to use etc.

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Ya quiero usarlo, quiero hacer cristal de mar con trozos de vidrio, pero necesito instrucciones en español. Vienen unos sobres que no sé para qué son, así como un frasco con trocitos blancos. Muchas gracias

Really simple easy to use, spare belts and everything you need to start. Check what stone you put in I had one disintegrate that I found in the bush. I recommend buying a bigger strainer.

This is a great rock tumbling kit. It comes with a trial set of grits, spare belts, and an excellent user manual that explains not only the usage, but it also gives good hints for rock selections. The rear page has an area where you can record the progress of your tumbles. The tumbler can be programmed for various speeds and days of tumbling. We quickly got it up and running with a selection of rocks from our beach. The 13 yr. old recipient was thrilled with it, even though there was a long wait for the final results. This is the case with all rock tumblers as there are multiple 7 day procedures with varying grits used. At the end, the rocks were smooth and well polished. We coated them with mineral oil for a nice shine. A warning: Because you're tumbling rocks, the unit is quite loud 24/7. It now has moved from the garage, where we could hear it throughout the house, to a back yard shed. It is definitely not recommended for an apartment dweller unless some sort of a sound proof cabinet is constructed.