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GENERAL
TUMBLING INSTRUCTIONS
Are
you interested in tumbling stones for our grab bags or your own
collection, have a tumbler and the stones but don't know how to
get started? Confused about how much grit to use? The following
is an overview of the steps to take to create beautifully tumbled
gemstones (thanks to Loretone):
STEP
1: (80 GRIT) Fill the tumbler barrel 2/3 to 3/4 full with properly
graded and sized stones. If the barrel is not full enough, you won't
get the proper tumbling action in the later steps. Add the necessary
amount of coarse grit to the stones in the barrel (see chart). After
adding the grit, slowly add water until the water level is just
touching the bottom of the top layer of stones. Do Not overfill
because too much water will inhibit the tumbling action. Run the
tumbler for 24 hours, them open the barrel to release any slight
gas build-up during the coarse grind. If the slurry appears pasty
or very thick, add a small amount of water. Let the tumbler run
for an hour and recheck, add water as needed. The First (coarse)
grind is the most important step and will take 7 to 10 days - be
patient and don't stop too soon. Note: If the stones are not all
smoothly rounded, it is necessary to repeat the coarse grind step
using a charge of new grit. The original grit will have broken down
too much to provide additional shaping. After the 1st grind, you
must clean the barrel and stones thoroughly to remove all traces
of the coarse grit slurry. Do not pour slurry into your plumbing
system, it will settle in the pipes and harden like cement. There
should be no visible grit or slurry left on the stones, you are
now ready for step 2.
STEP
2: (220 GRIT) Place the cleaned stones in the barrel, inspecting
them as you go, and removing any that need more coarse grinding
- if you have less than 2/3 barrel full of stones add plastic pellets
to make up the additional volume. Add proper amount of water and
grit according to table, reseal the barrel, and let it run for 2
to 3 days before checking stones. On the 7th day, they should have
a smooth matte finish over their entire surface, if not run for
additional 2 to 3 days. Plastic pellets will float to the top, remove
and clean them as they can be used again. Use the same cleaning
procedure you used in step 1.
STEP
3: (600 GRIT) Fine or pre-polish, place stones into the barrel,
following previous instructions. Run for about a week, checking
progress ever other day. Clean and inspect stones for final polishing
stage.
STEP
4: (CERIUM OXIDE POLISH OR) Gently place the stones into the
barrel to avoid any scratching or chipping. After charging the tumbler
with water and polishing compound (see table), add plastic pellets
to increase volume to 2/3 - 3/4 full. The pellets will help carry
the polishing compound and that will cushion the stones. Polishing
should take 5 to 7 days. At the end of the this time, remove and
inspect several stones. If they look the same when dry as they do
when wet, your batch is finished. If, after 7 days, your polished
gemstones appear to have a slight film on them, it can be removed
and extra shine and luster added by burnishing step. Before burnishing,
be sure to thoroughly clean the barrel and stones and recover the
plastic pellets.
Burnishing:
Place your stones into the barrel, add the same plastic pellets
and proper amount of powdered soap (do not use any liquid detergents,
dishwasher powders or any products that contain bleach or additives
as these products will damage the barrel and ruin the polish). Add
water as in previous steps and run for at least 4 days.
RECOMMENDED
TUMBLIING COMPOUND QUANTITIES
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CAPACITY
(Max Volume)
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(pounds)
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CUPS
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TABLESPOONS
OF TUMBLING COMPOUND
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1.5
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1-3/4
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4
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4
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5
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2
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1/2
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3.0
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3
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4
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4
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6
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3
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1
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4.5
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5
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8
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8
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8
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4
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1-1/2
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6.0
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7
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10
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10
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12
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5
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3
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12.0
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15
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20
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20
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24
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8
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4
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