Tumbling: Good/Fast/Cheap
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1 Tumbling: Good/Fast/Cheap
2 Not This Kind of Tumbling!
3 Disclaimer I am not an expert! There s a very great many approaches/tools/materials, so... Your mileage may vary!
4 What is Tumbling? Mother Nature s Version...
5 What is Tumbling?...The Lapidary Version Continual mechanical abrasion of stones to produce a polished surface on the stones
6 How Does It Work? Imagine these to be the surfaces of a stone...
7 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
8 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
9 Tumbling Processes Wet The abrasive is in a medium such as water Dry The abrasive is in a medium such as ground walnut shells
10 Tumbling Technologies Rotational Single axis Dual axis Mechanical vibratory Electro-magnetic vibratory
11 Rotary Tumblers - Single Axis
12 Rotary Tumblers - Dual Axis
13 Rotary Tumblers - Dual Axis
14 Vibratory Tumblers
15 E/M Vibratory Tumblers
16 Tumbling Technologies Rotational Shapes stones best Less costly in general Slowest Mechanical vibratory Shapes stones less Faster Electro-magnetic vibratory Speed!
17 Tumbling Requirements Rocks Abrasives Medium Patience More patience
18 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
19 Things That Matter Cleanliness Attention to detail Consistency Did I mention patience?
20 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!
21 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
22 The Process - Overview Shaping Grinding Polishing Burnishing
23 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
24 The Process - Shaping Clean materials Add to tumbler Add abrasive Coarse grade ( ) Add water Add ceramic pellets Add a LITTLE dishwashing soap Go
25 The Process - Shaping Cont d Check on process daily One week passes... Clean materials Add back to tumbler Add fresh abrasive Coarse ( ) Add water Add a LITTLE dishwashing soap Continue weeks...
26 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
27 The Process - Grinding Clean materials Add to tumbler Add abrasive Medium ( ) Add water Add addt l ceramic pellets (if needed) Add a LITTLE dishwashing soap Go
28 The Process - Grinding Cont d Check on process daily Up to one week passes... Clean materials Add back to tumbler Add fresh abrasive Medium ( ) Add water Add a LITTLE dishwashing soap Continue weeks...
29 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!
30 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...
31 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...
32 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
33 Abrasives Silicon Carbide SiC = Carborundum = Moissanite Mohs hardness: Silicon carbide is sharper and harder than standard forms of aluminum oxide. It has needle-like grains that resemble shards of broken glass
34 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
35 Abrasive Sizes Grit = Mesh = Microns Smaller Mesh = Bigger (coarser) particles Coarse: 100 Medium: 400 Fine: 600 Pre-Polish: 1200 Polish: 1200
36 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
37 Things I Wouldn t Do Again
38 Back to the Original Premise...
39 Tumbling Solutions Fast + Cheap Buy prefab Buy partially tumbled Collect from natural sources
40 Tumbling Solutions Good + Cheap DIY equipment Limited equipment investments Buy abrasives in bulk Meet someone with quality scraps
41 Tumbling Solutions Good + Fast Multiple methods Equipment investments w/ an eye to steady production Buy materials in bulk Make quality scraps
42 Demo s Recharging abrasive for second week of shaping in rotary tumbler Moving to 50,000 polish in eletromagnetic vibratory tumbler Final results to be revealed at subsequent meeting(s)
43 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
44 Some Suggestions...
45 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!
46 Resources DIY Kreigh s: Minerals/Homemade.shtml Community forums RTH: Commercial suppliers JS Gems: The Rock Shed: Kingsley North: Jesco:
47 Questions? (Related to rock tumbling, that is...)
48 Door Prizes Parcel of tumbled stones Wire-wrapped tumbled stone Tumbling Starter Kit (As Is!)
49 Thanks! (Presentation will be published on club web site in the near future)
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