Blue Marble NATIONAL GEOGRAPHIC Rock Tumbling Kit - 3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, an Educational STEM Science Kit

I bought this a while ago now and it works perfectly. If you only want to polish small volumes then buy one!

Bought this tumbler as a Christmas present. Recipient was at first delighted but the tumbler has now stopped working. On closer inspection it appears that the brushes are worn out. So I looked to buy some replacement brushes but apparently neither National Geographic nor Blue Marble supply them!! So this will be an expensive purchase. *Update* Have managed to contact Blue Marble and they have promised to send replacement. Watch this space but am happy with their response. Complete new rock tumbler set arrived today, expected by next Wednesday. Very happy husband, excellent customer service.

Ho 67 anni, nel 2023 ho acquistato questo articolo e, con mia grande sorpresa, mi ha regalato 1 anno e mezzo di grandi soddisfazioni! Ho burattato semplicemente sassi di mare, nessuna pietra di valore dunque, ma la soddisfazione forse è proprio questa: "mettere a nudo la loro bellezza nascosta"! Grazie a questa macchina ho aggiunto un super hobby al mio tempo di insegnante volontaria in pensione, proverò con il mercatino per la scuola a far conoscere ai bambini questa bellissima attività! Tre giorni fa la macchina ha avuto un problema, ma è stato subito risolto, ringrazio national geographic per la sollecita e graditissima soluzione trovata per me! CONSIGLIATISSIMO!

It literally is as easy as finding rocks on the ground, filling this thing up 2/3 full, adding some water just to cover the top of the rocks, sprinkle a little bit of powder, drop it on the machine, set the speed and days, and good to go. If you don't want to look for your own rocks that's okay because they give you a bag of red jasper, tigers eye, citrine, quartz, rose quartz, amethyst, and more to tumble for your first batch. The stones they gave looked like they were cut off from chunks used to make jewelry, but nonetheless were amazing to receive. The quality of the rubber barrel is amazing. It is thick and durable feeling. It also really dampens the sound that can be generated from most rock tumblers. The machine has three speeds and can go for the nine days. The back bar has a belt that goes to a motor that runs it. When you put the barrel of rocks on it stops vibrating because of the weight holding it down. I still placed a towel under it to further dampen the noise and all I hear is rocks sloshing and a faint motor hum. If you want to dampen sound further you can put a 5 gallon bucket over it and you won't hear pretty much anything. But I wouldn't want to do that to this machine. It's somewhat a thing of beauty because you know it's contents. And slight entertainment watching it tumble knowing again that you're stones a month from now will be polished and amazing. I mean you can't see the stones tumble because it's not a clear case, but that lets you use your imagination on the stones you put in. How much are they going to get worn down? What designs and patterns will they reveal? How shiny are they going to be? Patience is rewarded with this rock tumbler. I've had it for almost a month and have them on stage four, final polish. They have about a week to go and then they came with some gemfoam cubes for another few days polish. But each time I've pulled them out and rinse them off outside in the yard they look more and more amazing. Do not put any rock grit down your drains. It's a whole bunch of chips and tiny bits of rock that if you pour down your drain will get stuck in the pipes u bend because they're heavier than water. This is not an instant gratification machine. This will take minimum a month if you do a four-stage batch one week per stage. TLDR - large barrel size, dual clamp lid, starter kit comes with stones grit and jewelry stuff, quietest tumbler, just add water.

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