Introduction
The NATIONAL GEOGRAPHIC Professional Rock Tumbler Kit is designed to transform ordinary rough rocks into beautifully polished gemstones. This advanced kit features a durable 2lb rubber barrel, precise speed control, and an automatic shutoff timer to achieve optimal polishing results. It offers an engaging and educational experience for users interested in geology and lapidary arts.
Image: Rough rocks before and after tumbling, showcasing the transformation into polished gemstones.
What's in the Box
Your NATIONAL GEOGRAPHIC Professional Rock Tumbler Kit includes the following components:
- Heavy-Duty Tumbling Machine: The main unit with built-in programmable timer and speed control.
- 2lb Leak-Proof Rubber Barrel: Designed for reduced noise during operation.
- 1lb Rough Gemstones: A selection of unpolished rocks to begin your tumbling process.
- 4 Bags of Polishing Grits: Coarse, medium, fine, and polish grits for a complete four-stage process.
- Jewelry Fastenings: Components to create custom jewelry from your polished stones.
- Rock Strainer: For separating grit from rocks between stages.
- Learning Guide and Instructions: A detailed guide to the tumbling process and geological information.
Image: All components of the kit, including the tumbler, barrel, rough gemstones, grits, jewelry fastenings, and learning guide.
Setup
- Unpack Components: Carefully remove all items from the packaging and ensure all listed components are present.
- Place Tumbler: Position the tumbling machine on a stable, level surface. Ensure it is away from water sources and out of reach of small children.
- Prepare Barrel: Open the rubber barrel by unscrewing the knob and removing the metal and rubber lids.
- Add Rocks: Place your rough gemstones into the barrel. Fill the barrel approximately 1/2 to 2/3 full to allow sufficient space for tumbling.
- Add Grit: Refer to the instruction manual for the correct amount of coarse grit (Step 1) for the initial tumbling stage.
- Add Water: Fill the barrel with water until the rocks are just covered. Do not overfill.
- Seal Barrel: Securely place the rubber lid, then the metal lid, and tighten the knob to ensure a leak-proof seal.
- Place on Tumbler: Carefully place the sealed barrel onto the rollers of the tumbling machine.
Image: Visual guide for adding rocks, grit, and water to the tumbler barrel before sealing.
Video: Official National Geographic demonstration of the rock tumbler setup and initial operation.
Operating Instructions
The tumbling process involves four distinct stages, each using a different grit type and specific duration. Patience is key, as the entire process can take several weeks.
- Power On: Plug the tumbler into a power outlet. The digital display will illuminate.
- Set Days: Use the '+' and '-' buttons under 'DAYS' to set the desired tumbling duration for the current grit stage. Refer to the manual's suggested tumbling times.
- Set Speed: Use the '+' and '-' buttons under 'SPEED' to select the tumbling speed (1-3). Higher speeds are generally used for initial stages, lower for polishing.
- Start Tumbling: Press the 'Power' button to begin the tumbling cycle. The machine will run continuously until the set time elapses, then automatically shut off.
- Changing Grits: After each stage, turn off the tumbler, remove the barrel, and carefully open it. Pour the contents (rocks and used grit/water) through the provided strainer into a designated outdoor area or a bucket. Never pour used grit down household drains, as it can cause severe clogs. Thoroughly rinse the rocks and the inside of the barrel to remove all traces of the previous grit before proceeding to the next stage.
- Repeat Stages: Follow the instructions for adding the next grit type (medium, fine, polish) and repeat the tumbling process for the recommended duration for each stage.
Video: Detailed instructions on how to operate the rock tumbler, including setting days and speed.
Maintenance
Proper maintenance ensures the longevity and optimal performance of your rock tumbler:
- Cleaning: Always clean the barrel and rocks thoroughly between each grit stage to prevent cross-contamination. Use a garden hose or a dedicated bucket for rinsing.
- Belt Inspection: Periodically check the durable tumbling belt for wear and tear. A spare belt is included in your kit for replacement if needed.
- Storage: When not in use, store the tumbler and its components in a clean, dry place.
Image: Close-up of the tumbler's durable components, including the leak-proof stainless steel lid and tumbling belt.
Troubleshooting
If you encounter issues with your rock tumbler, refer to the following common problems and solutions:
- Tumbler Not Tumbling or Tumbling Intermittently:
- Ensure there is sufficient weight in the tumbling barrel. The barrel should be 1/2 to 2/3 full.
- Add more rocks or water to achieve the proper weight and allow for effective tumbling action.
- Check that the drive belt is properly seated and not worn out. Replace if necessary.
- Loud Operation:
- While the rubber barrel is designed for reduced noise, the tumbling of rocks will produce some sound. Consider placing the tumbler in a garage or utility room if noise is a concern.
- Ensure the barrel is properly sealed and seated on the rollers.
- Rocks Not Polishing as Expected:
- Ensure you are following the suggested tumbling times for each grit stage. Patience is crucial for optimal results.
- Thoroughly clean rocks and the barrel between grit stages to prevent coarser grit from contaminating finer stages.
- Consider using ceramic filler or plastic pellets with smaller batches of rocks to ensure proper tumbling action and prevent damage.
Specifications
- Product Dimensions: 6.5 x 9.25 x 5.5 inches
- Item Weight: 5 pounds
- Item Model Number: NGPROTUMBLER
- Manufacturer Recommended Age: 8 years and up
- Release Date: January 1, 2011
- Manufacturer: Discover with Dr. Cool
Safety Information
WARNING: CHOKING HAZARD - Small parts. Not suitable for children under 3 years.
Warranty & Support
This premium tumbler comes with National Geographic’s 100% satisfaction guarantee and a 2-year warranty. For any inquiries or support, please contact us at help@thinkbluemarble.com.
