Rock Tumbler

8/3/2019 Rock Tumbler

1/12

DUAL DRUM ROTARY ROCK

TUMBLER

Model 67632

SET UP AND OPERATING INSTRUCTIONS

Visit our website at: http://www.harborfreight.com

Read this material before using this product.

Failure to do so can result in serious injury.

SAVE THIS MANUAL.

Copyright 2009 by Harbor Freight Tools. All rights reserved. No portion of this manual or any artworkcontained herein may be reproduced in any shape or form without the express written consent ofHarbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing

improvements, actual product may differ slightly from the product described herein. Tools required forassembly and service may not be included.

For technical questions or replacement parts, please call 1-800-444-3353.


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Page 2For technical questions, please call 1-800-444-3353.SKU 67632

SAVE THIS MANUAL

Keep this manual for the safety warningsand precautions, assembly, operating,inspection, maintenance and cleaningprocedures. Write the products serial number

in the back of the manual near the assemblydiagram (or month and year of purchase ifproduct has no number). Keep this manualand the receipt in a safe and dry place forfuture reference.

IMPORTANT SAFETY

INFORMATION

In this manual, on the labeling, and

all other information provided withthis product:

This is the safety alert

symbol. It is used to alert

you to potential personal

injury hazards. Obey all

safety messages that follow

this symbol to avoid possible

injury or death.

DANGER indicates ahazardous situation

which, if not avoided, will result

in death or serious injury.

WARNING indicates a

hazardous situation

which, if not avoided, could

result in death or serious injury.

CAUTION, used with

the safety alertsymbol, indicates a hazardous

situation which, if not avoided,

could result in minor or moderate

injury.

NOTICE is used to

address practices not

related to personal injury.

CAUTION, without the

safety alert symbol, is

used to address practices not

related to personal injury.

General Tool Safety Warnings

WARNING Read all safety warnings

and instructions. Failure to follow the

warnings and instructions may result

in electric shock, fire and/or serious

injury.

Save all warnings and instructions

for future reference.

KEEP WORK AREA CLEAN. Cluttered1.areas and benches invite accidents.

DONT USE IN DANGEROUS2.ENVIRONMENT. Dont use power toolsin damp or wet locations, or expose themto rain. Keep work area well lighted.

KEEP CHILDREN AWAY. All visitors3.

should be kept safe distance from workarea.

MAKE WORKSHOP KID PROOF4.with padlocks, master switches, or byremoving starter keys.

DONT FORCE TOOL. It will do the job5.better and safer at the rate for which itwas designed.

USE RIGHT TOOL. Dont force tool or6.

attachment to do a job for which it was

not designed.


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RECOMMENDED MINIMUM WIRE

GAUGE FOR EXTENSION CORDS(120 VOLT)

NAMEPLATE

AMPERES(at full load)

EXTENSION CORD

LENGTH

25 50 100 150

0 6 18 16 16 14

6.1 10 18 16 14 12

10.1 12 16 16 14 12

12.1 16 14 12 Do not use.

TABLE A

USE PROPER EXTENSION CORD.7.Make sure your extension cord is in goodcondition. When using an extensioncord, be sure to use one heavy enough

to carry the current your product willdraw. An undersized cord will cause adrop in line voltage resulting in loss ofpower and overheating. Table A showsthe correct size to use depending oncord length and nameplate ampererating. If in doubt, use the next heaviergauge. The smaller the gauge number,the heavier the cord.

WEAR PROPER APPAREL. Do not wear8.

loose clothing, gloves, neckties, rings,bracelets, or other jewelry which may getcaught in moving parts. Nonslip footwearis recommended. Wear protective haircovering to contain long hair.

ALWAYS USE SAFETY GLASSES. Also9.use face or dust mask if cutting operationis dusty. Everyday eyeglasses only haveimpact resistant lenses, they are NOTsafety glasses.

MAINTAIN TOOLS WITH CARE. Keep10.tools sharp and clean for best and safestperformance. Follow instructions forlubricating and changing accessories.

DISCONNECT TOOLS before servicing;11.when changing accessories, such asblades, bits, cutters, and the like.

REDUCE THE RISK OF12.UNINTENTIONAL STARTING. Makesure switch is in off position before

plugging in.

USE RECOMMENDED ACCESSORIES.13.Consult the owners manual for

recommended accessories. The use ofimproper accessories may cause risk ofinjury to persons.

CHECK DAMAGED PARTS. Before14.further use of the tool, a guard or otherpart that is damaged should be carefullychecked to determine that it will operateproperly and perform its intendedfunction check for alignment of moving

parts, binding of moving parts, breakage

of parts, mounting, and any otherconditions that may affect its operation.

A guard or other part that is damagedshould be properly repaired or replaced.

GROUNDING INSTRUCTIONS

TO PREVENT

ELECTRIC SHOCK

AND DEATH FROM INCORRECT

GROUNDING WIRECONNECTION

READ AND FOLLOW THESE

INSTRUCTIONS:

110-120 V~ Grounded Tools: Tools

with Three Prong Plugs

In the event of a malfunction or1.breakdown, grounding provides a pathof least resistance for electric current

to reduce the risk of electric shock.This tool is equipped with an electric

cord having an equipment-groundingconductor and a grounding plug. Theplug must be plugged into a matchingoutlet that is properly installed andgrounded in accordance with all localcodes and ordinances.


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Do not modify the plug provided if it will2.not fit the outlet, have the proper outletinstalled by a qualified electrician.

Improper connection of the equipment-3.grounding conductor can result in a riskof electric shock. The conductor with

insulation having an outer surface thatis green with or without yellow stripes isthe equipment-grounding conductor. If

repair or replacement of the electric cordor plug is necessary, do not connect theequipment-grounding conductor to a liveterminal.

Check with a qualified electrician or4.

service personnel if the groundinginstructions are not completely

understood, or if in doubt as to whetherthe tool is properly grounded.

Use only 3-wire extension cords that5.have 3-prong grounding plugs and

3-pole receptacles that accept the toolsplug.

Repair or replace damaged or worn cord6.immediately.

125 V~ 3-Prong Plug and Outlet(for up to 125 V~ and up to 15 A)

Grounding

Pin

This tool is intended for use on a circuit7. that has an outlet that looks like the oneillustrated above in 125 V~ 3-ProngPlug and Outlet. The tool has agrounding plug that looks like the plugillustrated above in 125 V~ 3-ProngPlug and Outlet.

The outlet must be properly installed and8.grounded in accordance with all codesand ordinances.

Do not use an adapter to connect this9.tool to a different outlet.

Tumbler Safety Warnings

DO NOT USE OUTDOORS.1.

DO NOT USE WITH SAND.2.

Do not overload Tumbler.3.

Do not place Tumbler on a table. The4.units vibration may cause the Tumbler tomove when placed on a smooth, slipperysurface.

Use only in a safe, accessible location5.(such as a garage floor) near a poweroutlet.

Do not use near flammable materials.6.

Do not use in a closet or drawer; the7.Tumbler requires proper ventilation.

Avoid extreme temperatures. Do not8.let Tumbler freeze as the water in the

Rubber Barrel (12) will freeze andbecome unbalanced. This can overloadthe motor.

Do not touch motor immediately after9.

use. Motor becomes hot to the touchduring operation.

Maintain labels and nameplates on10.the tool. These carry important safetyinformation. If unreadable or missing,

contact Harbor Freight Tools for areplacement.

Avoid unintentional starting. Prepare to11.begin work before turning on the tool.

People with pacemakers should12.consult their physician(s) before use.Electromagnetic fields in close proximity


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to heart pacemaker could causepacemaker interference or pacemakerfailure.

WARNING: Some dust created by power13.sanding, sawing, grinding, drilling, andother construction activities, contains

chemicals known [to the State ofCalifornia] to cause cancer, birth defectsor other reproductive harm. Some

examples of these chemicals are: Lead from lead-based paints Crystalline silica from bricks andcement or other masonry products Arsenic and chromium from chemicallytreated lumberYour risk from these exposures varies,depending on how often you do this type

of work. To reduce your exposure tothese chemicals: work in a well ventilatedarea, and work with approved safetyequipment, such as those dust masksthat are specially designed to filter outmicroscopic particles. (California Health& Safety Code 25249.5, et seq.)

WARNING: Handling the cord on this14.product will expose you to lead, achemical known to the State of Californiato cause cancer, and birth defects orother reproductive harm. Wash handsafter handling. (California Health &Safety Code 25249.5, et seq.)

The warnings, precautions, and15.instructions discussed in this instructionmanual cannot cover all possibleconditions and situations that may occur.It must be understood by the operatorthat common sense and caution are

factors which cannot be built into thisproduct, but must be supplied by theoperator.

SAVE THESE

INSTRUCTIONS.

Specifications

Motor 120 V~ / 60 Hz

Capacity 3 lb. per drum

Barrel TypeRubber (allows for

quieter operation)

UNPACKING

When unpacking, make sure that theitem is intact and undamaged. If any partsare missing or broken, please call HarborFreight Tools at 1-800-444-3353 as soon aspossible.

HOW TUMBLER WORKS

Read the ENTIRE IMPORTANT

SAFETY INFORMATION

section at the beginning of this

manual including all text under

subheadings therein before set up

or use of this product.

TO PREVENT

SERIOUS INJURY

FROM ACCIDENTAL

OPERATION: Turn the PowerSwitch of the tool to its OFF

position and unplug the tool from

its electrical outlet before

assembling or making any

adjustments to the tool.

Note: For additional information regarding theparts listed in the following pages, referto the Assembly Diagram near the end ofthis manual.

The motion in the Barrel of a Tumbler simulatesthe natural action of flowing water or oceanwaves. Beaches and riverbeds contain rocksand pebbles smoothed by water and the abra-sive sand it carries. As rocks grind upon oneanother with constant water and sand in themix, they begin to round and smooth. Although


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this is a constant process, it does not however,naturally polish the rocks.

The Tumbler uses an abrasive media insteadof sand. It is graded by grain size, from finepowder sized grains, up to large sized grains.By changing (usually by weekly intervals) thegrain size, rotating from coarse, medium, to fine,the rock or gemstone is smoothed much morequickly than the natural process.

To polish using a Tumbler, add a metallic oxide

compound (not included). The complete pro-cess for a gemstone or rock to go from roughto a smooth, polished finish, usually takes from4-6 weeks.

Note:An Abrasive Kit (SKU 30956) is availablefrom Harbor Freight Tools. The kit includes 4oz. of coarse grit abrasive, 4 oz. fine grit, 2 oz.

of pre-polish abrasive and 2 oz. of polish.

OPERATING INSTRUCTIONS

Read the ENTIRE IMPORTANT

SAFETY INFORMATION

section at the beginning of this

manual including all text under

subheadings therein before set up

or use of this product.

Tool Set Up

TO PREVENT

SERIOUS INJURY

FROM ACCIDENTAL

OPERATION:

Turn the Power Switch of the tool

to its OFF position and unplugthe tool from its electrical outlet

before performing any

inspection, maintenance, or

cleaning procedures.

TO PREVENT SERIOUS INJURY:

DO NOT OPERATE WITH ANY

GUARD DISABLED, DAMAGED,

OR REMOVED. Moving guards

must move freely and close

instantly.

Work Piece and Work Area Set Up

Designate a work area that is applicable1.for prolonged Tumbler use. The workarea must not allow access by childrenor pets to prevent distraction and injury.

Route the power cord along a safe2.route to reach the work area without

creating a tripping hazard or exposingthe power cord to possible damage. The

power cord must reach the work areawith enough extra length to allow freemovement while working.

General Operating Instructions

CAUTION! Always check the Tumbler1.on a regular basis to make sure the

unit is running properly and is not

over-heating. Make sure that conditionsaround the tumbler are unchanged, and

that the tumbler continues to operate in asafe location.

Before the first use, and once a month2.thereafter, put a few drops of oil on theDriving Shaft (42) bearings.

Check the V-Belt (40) tension. It must3.be kept as loose as possible withoutallowing it to slip on the Pulley (36).Check before each use.

Make sure the exteriors of the Rubber4.Barrels (12) are clean so that they dont

slip on the rollers. Wipe with a soapycloth, then wipe clean with a damp cloth,and dry thoroughly. Do not use liquidcleaners or solvents.


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Make sure that the Stops (6) are lightly5.touching each Barrel Lid (9). This willprevent the Barrel Lids from rubbing

against the housing and will reducefriction.

To open either Rubber Barrel, remove6.

the Barrels from the unit and thenremove the Knurled Nuts (7) and theWashers (8). Next, remove the Barrel

Lids (9).

Note:7. It is imperative to load theTumbler with the proper amount ofmaterials, or the process will not besuccessful, and the motor could be

damaged. Underloaded barrels will notlift rocks up the inner side walls allowing

the cascading effect. Also, the abrasivematerial in an underloaded Tumblerwill tend to form a slurry and will not beeffective. An overloaded Tumbler will notallow the rocks to cascade. Lastly, toomuch water will cause the abrasives tofloat and not do their job.

Charging a barrel means loading it.8.Charge your barrels from 1/2 to 3/4 full.More pointed or abrasive rocks or stones

will require closer to 3/4 full, leavinga 1/2 full barrel when it comes time topolish.

Note:9. During tumbling, the stones willbe somewhat reduced in size.

Choose stones that are similar in nature.10.

They should have a mix of sizes rangingfrom small (3/16 to 3/8) to large (3/4to 1). 25% of the stones should be in

the smaller range. Split the remainingvolume between medium sized (3/8 to5/8) and large sized (5/8 to 1) stones.

For best results use a four step polish11.process. First, use a silicon carbidegrain, 60-90 grit size. Second, use a finesilicon carbide grain, 220 grit or a little

finer. Next, use a 600 grit silicon carbidegrain or a pre-polish. Lastly, use a polishof Tin Oxide, Cerium Oxide, or Titanium

Dioxide. When tumbling hard materials,it might be necessary to repeat thesteps.

Amounts of abrasive

(per Tumbler barrel):

Coarse Grind: 4 Tbsp.Medium: 4 Tbsp

Pre-polish: 6 Tbsp.Polish: 6 Tbsp.Burnish (soap): 1 Tbsp.Plastic Pellets (such as SKU 97818)

12. Add enough water to reach the bottom ofthe top layer of rocks.

13. Seal the Rubber Barrels and replacethe Barrel Lids, Knurled Nuts and theWashers.

14. Set the Rubber Barrels on the rollers andturn on the Power Switch (27). Makesure to check the Lid seal during the firstten minutes to make sure the tumblerisnt leaking.

Note: You can use this Tumbler to work withmetal and metal jewelry (without gemstones).This Tumbler may be used to take the jagged,sharp edges off of small metal parts. To polishbrass, gold, silver, or copper, use polishing me-dia designed for that specific purpose.

Note: For more in-depth information on pol-ishing jewelry, we recommend you purchase a

jewelry polishing handbook.


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First Grind, Pre-Polish, Polish and

BurnishingFirst Grind: Run the Tumbler for 24 hours,

checking for gas build-up at the first twelvehours. Slowly open the Barrel Lid, releasing

the small amount of gas that builds up duringthe process. Check the stones, they shouldshow slightly rounded edges.

Clean the seals and close the Lids. It isimportant to release the gas, otherwise it will

thicken the abrasive slurry. After another 24hours check again. If the slurry is thickening,add a little water.

Run for one hour and check again. If it is still

thick, add some more water. Let the Tumblerrun continuously, but check daily. Continuethis process for 7-10 days to remove thesharp edges and rough areas. Be patient.

This is the most important step. When all ofthe edges are rounded you are ready for thenext step.

Note: Between steps you must clean the Rub-ber Barrels and stones. Pour off the slurryinto a disposable container (such as a milkcarton) and take care that the stones remain

in the Rubber Barrels.

WARNING! Never pour the slurry into your

home plumbing system.

Next, place the stones into a clean containeror plastic bag. Fill the Rubber Barrels 1/2 fullwith water and clean out the remaining slurryand grit. Wipe and dry with a paper towel. To

clean the stones, gently slosh them aroundin clean water and remove them a few at atime checking for breaks or cracks. Discardbroken or cracked stones. Place the stonesin a plastic colander, or old nylon sock andrinse them completely off. There should be noslurry or grit remaining on the stones.

Second Grind: Carefully replace stones intoRubber Barrels. If Rubber Barrels are lessthan 1/2 full, add plastic pellets (not included)

to make up the difference. Add medium grit(see page 5) and water up to the bottom ofthe top layer of rocks. Reseal and tumble.

Run it for 2-3 days before checking. Theywill begin to smooth. After seven days theyshould have a smooth finish. If not, let themgo another 2-3 days. Clean again as you did

after the first grind.

Pre-polish: Place stones into the Rubber Bar-rels adding the correct amount of pre-polishand plastic pellets (not included) if necessary,and water. Let it run for a week, checking

every other day. After a week take out 2-3stones to test the progress. On a dampenedpiece of leather, old rug, or towel, sprinkle a

small amount of polishing compound, and rubthe stone vigorously with it. You should see adefinite shine in a few moments. If they shine,clean the Rubber Barrels and you are readyfor the last step. If not, pre-polish and checkin 24 hours.

Polish: Gently set stones in the Rubber Bar-

rels. Charge the tumbler with fresh water, pol-ishing compound, and plastic pellets to helpcushion the stones. Make sure the volume isat least 1/2 full, preferably 3/4 full. Tumble for5 to 7 days. If they look the same dry as theydo wet, then they are finished. If they have aslight film, they need to be burnished.

Burnishing: Remove the stones, clean the

Rubber Barrels and remove and recover the

plastic pellets (set aside). Place the stonesback in the Rubber Barrels and replace thesame pellets. Use powdered soap such asIvory or White King. Do not use liquiddetergents or dishwasher powders that havebleach. Add water as in previous steps andseal the Rubber Barrels Tumble for four days,

and clean the Barrels.


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Notes to remember:

Always clean Barrels and stones between1.steps.

When polishing or burnishing use plastic2.pellets (they will wear out during use).

Use a log book to keep track of each step.3.

If starting with stream-worn or smooth4.stones, you may be able to eliminate the

first step.

Purchase a mineral book which details5.selection of stones for tumbling. As you

learn about relative hardness of eachstone you will achieve greater success bynot mixing soft and hard stones.

Always dispose of material properly.6.

MAINTENANCE ANDSERVICING

Procedures not specifically

explained in this manual must

be performed only by a qualified

technician.

TO PREVENT

SERIOUS INJURY

FROM ACCIDENTAL

OPERATION: Turn Power Switchto OFF position and unplug

tool from electrical outlet before

performing inspection,

maintenance, or cleaning.

TO PREVENT SERIOUS INJURY

FROM TOOL FAILURE: Do not

use damaged equipment. If

abnormal noise or vibration

occurs, have the problem

corrected before further use.

Cleaning, Maintenance, and

Lubrication

BEFORE FIRST USE and once a1.month following, put a few drops of oilon the Driving Shaft Bearings (42).

BEFORE EACH USE,2. inspect generalcondition of tool. Check for loosehardware, misalignment or binding of

moving parts, cracked or broken parts,damaged electrical wiring, and anycondition that may affect safe operation.

AFTER USE,3. wipe external surfaces ofthe tool with clean cloth.

4. WARNING! If supply cord of powertool is damaged, it must be replaced

only by a qualified service technician.

V-Belt Inspection and Tensioning

Check the V-Belt (40) tension. It must1.be kept as loose as possible without

allowing it to slip on Pulley (36). ToAdjust Belt Tension:

Unplug the Power Cord (28) from itsa.

outlet.

Turn unit over.b.

Loosen the Screws (35) and removec.the Screen (34).

Check V-Belt for cracks, tears ord.

other damage. If needed, replaceV-Belt. Replacement V-Belts aresold under Sku 93835.

Reinstall the Screen and foure.Screws.

The O-Ring (37) near the V-Belt may2.also need to be replaced as needed.Five extra replacement O-Rings areincluded with this Tumbler.

Make sure the exterior of the Rubber3.

Barrels are clean so that neither oneslips on the rollers. Wipe each with asoapy cloth, then wipe clean with a dampcloth. Dry thoroughly. Do not use liquidcleaners or solvents.


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Part Description Qty.1 Screw (M3x5) 52 Shaft Cover 23 Bushing Set 44 Shaft A 15 Idler Shaft Set 2

6 Stop 27 Knurled Nut 28 Washer 29 Barrel Lid 2

10 Boot Gasket 211 Inner Lid 212 Rubber Barrel 213 Top Cover 114 Screws (M3x16) 415 Middle Plate 116 Spacer (B) 417 Fan 118 Square Nuts 2

19 Motor 120 Motor Connectors 221 Spacer 4

Part Description Qty.22 Inner Nut 123 Adjusting Plate 124 Washers (4) 425 Spring Washers (4) 426 Screws (M4x50) 4

27 Power Switch 128 Power Plug/Cord 129 Plug 130 Outer Nut 131 Small Set 132 Nuts Connector 133 Foot A 434 Screen 135 Screws (M4x8) 636 Pulley 137 O-Ring (8) 638 Washer (8) 139 Foot B 2

40 V-Belt 141 Base 142 Driving Shaft Bearing 1

PLEASE READ THE FOLLOWING CAREFULLY

THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLYDIAGRAM IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER ORDISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE

OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIEDTO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR

EXPRESSLY STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY

CERTIFIED AND LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISKAND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENTPARTS THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.

PARTS LIST


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ASSEMBLY DIAGRAM

Record Products Serial Number Here:

Note: If product has no serial number, record month and year of purchase instead.

Note: Some parts are listed and shown for illustration purposes only, and are not availableindividually as replacement parts.

Please note: Not all parts are washable.


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LIMITED 90 DAY WARRANTY

Harbor Freight Tools Co. makes every effort to assure that its products meet high qualityand durability standards, and warrants to the original purchaser that this product is free fromdefects in materials and workmanship for the period of 90 days from the date of purchase. Thiswarranty does not apply to damage due directly or indirectly, to misuse, abuse, negligence or

accidents, repairs or alterations outside our facilities, criminal activity, improper installation,normal wear and tear, or to lack of maintenance. We shall in no event be liable for death,injuries to persons or property, or for incidental, contingent, special or consequential damagesarising from the use of our product. Some states do not allow the exclusion or limitation ofincidental or consequential damages, so the above limitation of exclusion may not apply toyou. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESSOR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.

To take advantage of this warranty, the product or part must be returned to us withtransportation charges prepaid. Proof of purchase date and an explanation of the complaintmust accompany the merchandise. If our inspection verifies the defect, we will either repair or

replace the product at our election or we may elect to refund the purchase price if we cannotreadily and quickly provide you with a replacement. We will return repaired products at ourexpense, but if we determine there is no defect, or that the defect resulted from causes notwithin the scope of our warranty, then you must bear the cost of returning the product.

This warranty gives you specific legal rights and you may also have other rights whichvary from state to state.

3491 Mission Oaks Blvd. PO Box 6009 Camarillo, CA 93011 (800) 444-3353

Documents

Rock Tumbler