Thumler's Model A-R12 Belt
Replacing a broken A-R12 belt is an easy job that requires no tools. Having an extra belt around is good practice so when one breaks you don't have to wait for one in the mail to continue tumbling.
A-R12 Tumbler Bearings
Thumler's A-R12 bearings are made of durable polyethylene. Bearings are simple to replace. Remove the retainer clip, slide the old bearing off, put the new one on, and replace the retainer clip. We suggest purchasing some extra retainer clips just in case you damage some while removing or replacing them.
Stop Squeaky Bearings
We oil our Thumler's Tumblers every 30 days (or after each batch of rocks) with 3-IN-ONE Multi-Purpose Oil or SAE20 motor oil. Only one drop on each bearing. See our article for photos and detailed instructions.
Needle-Tip Oil Bottle
Have your own SAE20 motor oil or general purpose oil? Use one of these needle-tip bottles to accurately dispense it on tumbler bearings and motors. Keep your tumbler running smooth and quiet.
Thumler's A-R12 Barrel Guides
Thumler's A-R12 tumbler barrel guides are made of nylon which makes them durable. You won't have to change these very often but when you do it is a simple job. Remove the retainer clip, remove the bearing and old guide, slide on a new guide and replace the bearing and retainer clip. Purchasing some extra retainer clips in case you damage one is a good idea.
Thumler's Shaft Retainer Clips
Retainer clips are used to hold the bearings on the end of the shafts and to hold the nylon rollers in the proper location on the idler shaft.
Thumler's Tumbler Nylon Roller
After years of use, the nylon rollers on the idler shaft may wear down and need to be replaced. We offer a set of two rollers for the A-R1 and A-R6 tumblers and a set of three rollers for the A-R2 and A-R12 tumblers. Roller replacement is simple - just remove the old rollers from the idler shaft and slide the new rollers into their place.
Thumler's Rubber Roller
These rubber rollers for the drive shaft are what give the barrel traction and keep it turning to tumble the rocks inside. Replace worn rollers for optimum tumbling action. A set of two rubber rollers is needed for the A-R1 and A-R6 tumblers while a set of three rollers is needed for the A-R2 and A-R12 tumblers.
Thumler's A-R12 Drive Pulley
If the pulley on the drive shaft of your A-R12 gets damaged, this part will replace it. This drive pulley will also fit any of the following tumblers: Thumler's MP-1, A-R1, A-R2, A-R6, Model B, Model T, and Model T2.
Thumler's A-R12 Drive Shaft
A replacement drive shaft for the Thumler's A-R12 rotary tumbler. Easily replaced; just remove the belt, remove the old shaft, snap the new one in, and put the belt back on. Includes all parts: Shaft, bearings, rubber rollers, pulley and retainer clips.
Thumler's A-R12 Idler Shaft
A replacement idler shaft for the Thumler's A-R12 rotary tumbler. This is a complete shaft with all parts included that can be replaced in a matter of seconds.
Thumler's A-R12 Barrel Lid
This plastic lid fits the Model A-R12 barrel and has a 12-pound tumbling capacity. Over time these plastic lids will wear through in the center, so having an extra one on standby is a good idea.
Thumler's A-R12 Barrel Retaining Clamp
This is a metal retaining clamp for Thumler's A-R12 Tumbler barrel that gives the barrel its watertight seal. An 8mm wrench is needed to install.
Thumler's A-R12
This large 12-pound capacity hexagon barrel was designed for Thumler's Model A-R12 rock tumbler. It is a complete barrel that includes the soft rubber barrel, plastic lid and sealing ring.
| Barrel Dimensions in Inches |
| |
Height |
Diameter |
| Inside (usable space) |
7 3/8 |
5 3/4 |
| Outside |
8 1/4 |
8 5/16 |
Metal Base for Thumler's Model A-R12
This is the metal base for your tumbler. There are four pairs of slots to hold drive and idler shafts. Use the two front slots to run two 3-pound barrels on A-R2 shafts. Use the front and back slots to run the A-R12 barrel on A-R12 shafts.
A-R12 Tumbler Motor Pulley
This pulley fits the motor on the A-R12 Thumler's Tumbler. This Thumler's A-R12 pulley has a 1/4" bore diameter and 3/4" outside diameter. A 2mm allen wrench is needed to adjust or install pulley.
Thumler's A-R12 Tumbler Motor and Pulley
This Thumler's A-R12 rock tumbler motor is thermally protected. It will automatically shut off if it gets too hot. This motor is very easy to hook up and get back to tumbling.
Thumler's A-R12 Motor Mounting Nuts
Two keps nuts (nuts with attached, free spinning, star-shaped lock washers) are used to keep the motor in place. They screw onto the two motor-mounting bolts where they extend through the motor-mounting brackets. A 9mm wrench is needed to install.
A-R12 Rock Tumbler
Thumler's A-R12 rotary rock tumbler can process about 8 pounds of rough into polished gemstones. It can easily be converted to run two 3-pound barrels by moving the idler shaft. 3-pound barrels sold separately. More Information
