jpb007
off to a rocking start
Member since August 2009
Posts: 9
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Post by jpb007 on Sept 30, 2009 10:43:57 GMT -5
I apoligize if this has been asked in another post. I never was clear when reading the different recipes for adding grit if it is measured by volume or by weight.
Thanks in advance.
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Post by superioragates on Sept 30, 2009 10:47:52 GMT -5
I read somewhere that you should use 1 lb of grit, to 10 lbs of rock. BUT, someone on here, I think it was toad.......  ? has a thread on just this subject. I think it's in the general rocks thread....but not sure. Let me look....... |
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Post by superioragates on Sept 30, 2009 10:50:09 GMT -5
Nope, it's in "lapidary tips", the very first thread in there, go check it out, if it doesn't help, then post another comment here on it, someone will definetly be able to help
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Post by Hard Rock Cafe on Sept 30, 2009 12:27:04 GMT -5
Generally by weight, but I occasionally see posts referring to volume (e.g. 3 tablespoons), especially when referring to burnish.
Chuck
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Post by Toad on Sept 30, 2009 13:31:17 GMT -5
I do it by volume - a cup and a quarter for a 12 pound barrel.
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Post by Hard Rock Cafe on Sept 30, 2009 16:14:04 GMT -5
I sort of do the same thing: I weighed the proper amount of each grit and put a fill line for each one on it's own measuring cup. Now I just fill to the line.
Grit weight doesn't change, nor does the volume. So a consistent volume = a consistent weight.
Chuck
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carloscinco
fully equipped rock polisher
Member since July 2008
Posts: 1,639
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Post by carloscinco on Sept 30, 2009 16:58:50 GMT -5
I've always assumed that a recipe for tumbling, when listing the amount of grit to use in oz. or ounces, is referring to volume. It works for me.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Sept 30, 2009 17:13:39 GMT -5
Greeting Ladies & Gents, jpb007: Grit & polish is measured by weight, dependent upon your barrel average load set by the manufacturer. Both the general UK & USA recipes offered when you purchase either a rotary or vibe tumbler tends to be based upon volume rather than by weight, the rock they base their recipes upon is Chalcedony; Flint Agates (Moh's 6.5) for hardness; usually uniform hardness & needs to be reloaded or recharged every 7 days in a rotary tumbler. Both UK & USA recipes tend to be valid, but the USA recipe tends to be extremely too wasteful on expensive polishes. -- I hail from (The Barony of Seabegs) Bonnybridge, Stirlingshire, U.K, where aliens sometimes come for a visit & about 4 miles west from this monstrosity! Sticky's: Vendors worldwide, How to identify rocks & minerals!, FAQS: Add Tags:Save money on expensive grits & polishes! |
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Post by Jack ( Yorkshire) on Oct 1, 2009 2:28:52 GMT -5
Hi jpb007
I use the Tea spoon (weight method )
BUT I balance that with how the grit is used eg-- What is left over ,
Then tailor what I put in to the load so there is little or no grit wastage
Having wrote down these weights over the years , I have a good Idea how to charge the barrel to get the best and most economical use out of the grit used and the time it takes
(depending on Speed , Feet per Min travelled)
My Tumbler (self Built ) travells at 42 RPM
Keeping a log of your results is a great help and a must !! you will never regret it
Jack
Yorkshire UK
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jpb007
off to a rocking start
Member since August 2009
Posts: 9
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Post by jpb007 on Oct 1, 2009 7:46:38 GMT -5
Thanks for all the input.
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stefan
Cave Dweller 
Member since January 2005
Posts: 14,113
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Post by stefan on Oct 1, 2009 10:28:55 GMT -5
Personal Preference- I add it by the teaspoon, or in the case of my 12Lber by the cup. Measurments do not have to be exact- a little over or under really does not matter- the important thing is to not "rush" a stage- especially in the course grind.
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rockdewd
has rocks in the head
Member since October 2007
Posts: 605
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Post by rockdewd on Oct 1, 2009 11:28:28 GMT -5
I use between one and a quarter and one and a half cups in my 12 lb barrels and 2 cups in my 15 lb. I run only 60/90 in my rotaries and finish in vibes. I've found 3 weeks is a good time span for all the grit to be used up in a 12 lb and 4 weeks in a 15 lb.
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? has a thread on just this subject. I think it's in the general rocks thread....but not sure. Let me look.......
