Tumbling: Good/Fast/Cheapshenandoahvalleyrockclub.org/resources/documents/SVGMS...Fast + Cheap Buy...
Transcript of Tumbling: Good/Fast/Cheapshenandoahvalleyrockclub.org/resources/documents/SVGMS...Fast + Cheap Buy...
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Tumbling: Good/Fast/Cheap
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Not This Kind of Tumbling!
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Disclaimer
•I am not an expert!•There’s a very great many approaches/tools/materials, so...
•Your mileage may vary!
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What is Tumbling?Mother Nature’s Version...
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What is Tumbling?...The Lapidary Version
•Continual mechanical abrasion of stones to produce a polished surface on the stones
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How Does It Work?Imagine these to be the surfaces of a stone...
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Tumbling Might Not Be For You If...•Washing dishes bums you out•You have “Destinesia” -
• I.e., Destination Amnesia• Can’t remember what you walked into a room for
• (Pre-cursor to “CRS Syndrome”)
•Instant gratification is your life’s purpose• Not gonna happen with this pursuit
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Why Tumble Rocks?•Make rocks pretty!•Prepare “cabs” for projects w/o having a cabbing machine
•Test new materials for ‘polish-ability’•Make scraps from other projects useful
•Introduction to lapidary techniques•Practical application of mineralogy
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Tumbling Processes•Wet
• The abrasive is in a medium such as water
•Dry• The abrasive is in a medium such as ground walnut shells
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Tumbling Technologies•Rotational
• Single axis• Dual axis
•Mechanical vibratory•Electro-magnetic vibratory
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Rotary Tumblers - Single Axis
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Rotary Tumblers - Dual Axis
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Rotary Tumblers - Dual Axis
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Vibratory Tumblers
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E/M Vibratory Tumblers
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Tumbling Technologies•Rotational
• Shapes stones best• Less costly in general• Slowest
•Mechanical vibratory• Shapes stones less• Faster
•Electro-magnetic vibratory• Speed!
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Tumbling Requirements•Rocks•Abrasives•Medium•Patience•More patience
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What Can You Tumble?•Rocks - Glass•Flats•Rounds•Possible sizes a function of tumbler dimensions
•For best results, materials of similar hardness are best
•For best results, a mix of sizes is best
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Things That Matter•Cleanliness•Attention to detail•Consistency•Did I mention patience?
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Factors To Consider•How hard is the material?•How similar in hardness are the individual pieces of the material?
•How “brittle” is the material?•What’s (chemically) in the material?
• Example: Bumble Bee Jasper = Arsenic!
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Tumbling - Other Necessities•Location where noise isn’t an issue•Access to used grit disposal area•Ceramic pellets•Plastic beads•Burnishing compounds•Dishwashing soap•Strainers•Brushes for scrubbing
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The Process - Overview•Shaping•Grinding•Polishing•Burnishing
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The Process - Shaping Gen’l•Best accomplished with a rotary tumbler & wet process
•Select materials & abrasives•Prepare equipment•Make notes•Combine materials/abrasives/water•Energize!•Monitor & inspect
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The Process - Shaping•Clean materials•Add to tumbler•Add abrasive
• Coarse grade (46 - 60- 80 - 100)
•Add water•Add ceramic pellets•Add a LITTLE dishwashing soap•Go
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The Process - Shaping Cont’d•Check on process daily•One week passes...
• Clean materials• Add back to tumbler• Add fresh abrasive
• Coarse (46 - 60 - 80 - 100)
• Add water• Add a LITTLE dishwashing soap
•Continue 2 - 3 - 4 - 5 - 6 weeks...
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The Process - Grinding Gen’l•Best accomplished with rotary or vibratory tumbler & wet process
•Select materials & abrasives•Prepare equipment•Make notes•Combine materials/abrasives/water•Energize!•Monitor & inspect
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The Process - Grinding•Clean materials•Add to tumbler•Add abrasive
• Medium (220 - 400 - 600)
•Add water•Add addt’l ceramic pellets (if needed)•Add a LITTLE dishwashing soap•Go
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The Process - Grinding Cont’d•Check on process daily•Up to one week passes...
• Clean materials• Add back to tumbler• Add fresh abrasive
• Medium (220 - 400 - 600)
• Add water• Add a LITTLE dishwashing soap
•Continue 2 - 3 - 4 weeks...
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The Process - Polishing Gen’l•Best accomplished w/ vibratory or E/M tumbler & dry process
•Select materials & pre-polish or polish•Prepare equipment
• Recommend separate vessel for polish!
•Make notes•Combine materials + abrasives•Energize!
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The Process - Polishing•Check on process daily•Up to one week passes...
• Clean materials• Add to tumbler• Add fresh abrasive
• Pre-polish (1200)
• Add water• Add a LITTLE dishwashing soap
•Continue 1 - 2 weeks...
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The Process - Polishing Cont’d•Check on process daily•Up to one week passes...
• Clean materials• Add to tumbler• Add fresh abrasive
• Polish (Aluminum Oxide or others)
• Add water• Add a LITTLE dishwashing soap
•Continue 1 - 2 weeks...
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The Process - Burnishing•Considered optional by some•Puts final “shine” on materials•Softer abrasive “buffs” the material•Method depends on tumbler used
• Ivory soap flakes• Borax• “Home-made” Vibra-Dry
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Abrasives•Silicon Carbide
• SiC• = Carborundum• = Moissanite• Mohs hardness: 9 - 9.5• Silicon carbide is sharper and harder than standard forms of aluminum oxide.
• It has needle-like grains that resemble shards of broken glass
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Abrasives
•Aluminum Oxide• Al2O3
• = Corundum• = Linde A & B• Mohs hardness: 9.0• It tends to wear down until it becomes too dull to cut efficiently
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Abrasive “Sizes”• Grit = Mesh = Microns• Smaller Mesh = Bigger (coarser) particles• Coarse: ≤ 100• Medium: ≤ 400• Fine: ≤ 600• Pre-Polish: 1200• Polish: ≥ 1200
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Lessons Learned•Grit grinds everything•Weight + wet + continuous motion = Death to things mechanical
•Quality of materials directly impacts degree of success
•Attention to detail - ditto•Watch the weather forecast
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Things I Wouldn’t Do Again
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Back to the Original Premise...
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Tumbling Solutions
Fast + Cheap
✓Buy prefab✓Buy partially tumbled✓Collect from natural sources
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Tumbling Solutions
Good + Cheap
✓DIY equipment✓Limited equipment investments✓Buy abrasives in bulk✓Meet someone with quality scraps
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Tumbling Solutions
Good + Fast•Multiple methods•Equipment investments w/ an eye to steady production•Buy materials in bulk•Make quality scraps
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Demo’s•Recharging abrasive for second week of shaping in rotary tumbler
•Moving to 50,000 polish in eletro-magnetic vibratory tumbler
•Final results to be revealed at subsequent meeting(s)
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Now What?•So you’ve got a pile of tumbled stones...• Bring to rock shop and turn into “cabs”• Build a collection
• Including ‘before’ & ‘after’ samples
• Give as gifts• Turn into craft projects
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Some Suggestions...
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Recommendations For Getting Started
•Decide your level of interest/involvement
•Acquire equipment consistent w/ that•More time spent = less money spent•More money spent = less time spent•Make sure this will be fun!
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Resources•DIY
• Kreigh’s: http://tomaszewski.net/Kreigh/Minerals/Homemade.shtml
•Community forums• RTH: http://andy321.proboards.com/
•Commercial suppliers• JS Gems: http://www.jsgemslapidary.com/
• The Rock Shed: http://therockshed.com/
• Kingsley North: http://www.kingsleynorth.com/
• Jesco: http://www.jescoproducts.com/
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Questions?
(Related to rock tumbling, that is...)
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Door Prizes
Parcel of tumbled stones
Wire-wrapped tumbled stone
Tumbling “Starter Kit” (As Is!)
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Thanks!(Presentation will be published on club web site in the near future)