bushmanbilly
Cave Dweller
Member since October 2008
Posts: 4,719
|
Post by bushmanbilly on Jan 29, 2016 22:37:27 GMT -5
Yes, I have bought from Kramer. They do precision abrasives. Never even thought about those big aluminum oxide chunks rubbing against the hopper. Some members have worn thru their hoppers, bet it was the media. Plastic floaters a good hint. Could the hopper be made of polyethylene ? I have worn out 3 bowls with ceramic and course grits. Still on my original polish bowl.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,562
|
Post by jamesp on Jan 29, 2016 23:55:37 GMT -5
Yes, I have bought from Kramer. They do precision abrasives. Never even thought about those big aluminum oxide chunks rubbing against the hopper. Some members have worn thru their hoppers, bet it was the media. Plastic floaters a good hint. Could the hopper be made of polyethylene ? I have worn out 3 bowls with ceramic and course grits. Still on my original polish bowl. Part of the game. Rubber may hold up longer. Polyurethane for sure.
|
|
bushmanbilly
Cave Dweller
Member since October 2008
Posts: 4,719
|
Post by bushmanbilly on Jan 30, 2016 0:06:32 GMT -5
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,562
|
Post by jamesp on Jan 30, 2016 0:13:57 GMT -5
That is funny. Ingenious and some though.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,562
|
Post by jamesp on Jan 30, 2016 11:55:31 GMT -5
Well, something did not jive in the Viking model vibe with 3/8 round ceramic media. Was using quartz pea gravel, agate bits, glass bits for many batches with excellent results. Not knocking ceramic media in a vibe, but suggesting to stay away from round ball shaped ceramic media. No edge frosting. But divots on all edges and faces of the rock equally. No doubt it was the ball media. Here is a crystalline quartz. The agates and coral damage was much less, but they are damaged too. glare to show divots on flat face No edge frosting, just divots. Edge frosting easy to trouble shoot; it happens worst on the most pointed edges. Will vibe damage off with SiC 220 and start back with AO 500 and old filler. Matter solved.
|
|
Intheswamp
Cave Dweller
Member since September 2015
Posts: 1,910
|
Post by Intheswamp on Jan 30, 2016 12:05:14 GMT -5
Plunger ? Plunger...
|
|
Intheswamp
Cave Dweller
Member since September 2015
Posts: 1,910
|
Post by Intheswamp on Jan 30, 2016 12:12:21 GMT -5
Thanks for sharing those images of the divots, James. The ceramic round ball definitely did a number on that quartz. But, is it from the shape, size, or formula/hardness of the balls?
|
|
|
Post by captbob on Jan 30, 2016 12:14:03 GMT -5
Well, something did not jive in the Viking model vibe with 3/8 round ceramic media. Was using quartz pea gravel, agate bits, glass bits for many batches with excellent results. Not knocking ceramic media in a vibe, but suggesting to stay away from round ball shaped ceramic media. No edge frosting. But divots on all edges and faces of the rock equally. No doubt it was the ball media. Here is a crystalline quartz. The agates and coral damage was much less, but they are damaged too. glare to show divots on flat face No edge frosting, just divots. Edge frosting easy to trouble shoot; it happens worst on the most pointed edges. Will vibe damage off with SiC 220 and start back with AO 500 and old filler. Matter solved. I always enjoy watching your experiments. Don't always comment, and I'm not sure I have a comment here, but this is interesting. Do you have any theory (guesses) other than the hardness of the ceramic media? Did the balls seem to change what you regard as "normal" in any way? Have you previously used the cylindrical ceramics with different results? What grit were the above rocks in?
|
|
napoleonrags
Cave Dweller
Member since October 2015
Posts: 474
|
Post by napoleonrags on Jan 30, 2016 21:14:48 GMT -5
Agreed. Thank you for the selfless scientific experiments.
|
|
bushmanbilly
Cave Dweller
Member since October 2008
Posts: 4,719
|
Post by bushmanbilly on Jan 30, 2016 23:17:24 GMT -5
Never know could have turned out the completely in your favor. But now you know. I think I need to order some new ceramics. The blue ones were big at one time.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,562
|
Post by jamesp on Jan 31, 2016 2:57:55 GMT -5
Agreed. Thank you for the selfless scientific experiments. Welcome to the forum napoleanrags. Experiments as fun as the tumbling. Fascinated by the process side of it all. captbob About all ceramic media is Mohs 8+. About all of it is just a large chunk of aluminum oxide with a silica binder. Have used the cylinders but only small amounts mixed with small rock media. Nothing looked different in the action. The balls went in with a smooth high polish and ended with a high polish w/out divots. Not sure why they ball peened my rocks. I was doing the routine AO 500 run with a cup sugar/cup water as done a dozen times. Guessing the damage occurred in the bottom where all the weight is. Could have set up a harmonic, who knows. Chuck mention the contact point would have less contact. I know that a slightly rounded hammer can chip rocks w/out fractures and the ball peen hammer sends much more fractures.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,562
|
Post by jamesp on Jan 31, 2016 2:59:42 GMT -5
bushmanbilly How old are those smaller media. Could the grey ones have silicon carbide particles ?
|
|
Deleted
Deleted Member
Member since January 1970
Posts: 0
|
Post by Deleted on Jan 31, 2016 8:53:02 GMT -5
What diameter are your media,almost said your balls.lol.the ones I use are a mix of 4,5,6 mm.maybe the larger diameter had something to do with it,also you may be right with the grey/grit thing.i had purchased some that were grey once,they felt really smooth to the touch but they had grit impregnated in it. Dave
|
|
|
Post by captbob on Jan 31, 2016 9:13:57 GMT -5
James, what are you doing up at 3 in the morning?
|
|
Intheswamp
Cave Dweller
Member since September 2015
Posts: 1,910
|
Post by Intheswamp on Jan 31, 2016 10:12:25 GMT -5
Whatever he usually does when he's posting at 3am...probably figuring out a new lazy-susan for grinding his fire pits on...or how to make those SpaceX rockets land on the right end.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,562
|
Post by jamesp on Jan 31, 2016 10:17:44 GMT -5
What diameter are your media,almost said your balls.lol.the ones I use are a mix of 4,5,6 mm.maybe the larger diameter had something to do with it,also you may be right with the grey/grit thing.i had purchased some that were grey once,they felt really smooth to the touch but they had grit impregnated in it. Dave 10mm Dave, bigger than yours(ha). I think the larger size is part if the problem. Like too big for the voids. Would prefer your 4-5-6 's. No doubt the vibe is too aggressive and may not have a low enough setting for the 10mm balls. Those SiC impreganted ceramics may be fine for roughing. Thinking they would be detrimental to finishing steps at any point. Don't care for SiC at any point in finishing operations, better job for aluminum oxide.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,562
|
Post by jamesp on Jan 31, 2016 10:33:58 GMT -5
James, what are you doing up at 3 in the morning? Me and couple of buddies rode bicycles on the new Atlanta Beltway till late. Ate fine foods and drank too many spirits. Area was packed with people so we parked at different locations and met at Krog Street Market on bicycles. After riding and partaking we departed and went back to our cars and drove the long way home except Steve. He could not find his vehicle. I had to go back into the city and help him find it. inebriation issue Ed Intheswamp I did do a major clean up of the tumbling area yesterday. Had a big pile of experiment debitage to throw away. turbines/reactors/particle accelerators etc
|
|
|
Post by captbob on Jan 31, 2016 11:20:44 GMT -5
debitage ooooooooooooh! new word for me noun, Archaeology. 1. lithic debris and discards found at the sites where stone tools and weapons were made. Debitage is all the material produced during the process of lithic reduction and the production of chipped stone tools. This assemblage includes, but is not limited to, different kinds of lithic flakes and lithic blades, shatter and production debris, and production rejects. en.wikipedia.org/wiki/Debitagebonus word: (not new) lithic adjective1. pertaining to or consisting of stone. 2. Petrology. pertaining to clastic rocks, either sedimentary or volcanic, containing a large proportion of debris from previously formed rocks: wife headed down the interstate with mother in law to go to some outlet mall AND I learned a new word this is a good day! if only MIL's little whiny dog hadn't been left in my care. Hoping the rottweilers will take care of that detail for me. SOON
|
|
bushmanbilly
Cave Dweller
Member since October 2008
Posts: 4,719
|
Post by bushmanbilly on Jan 31, 2016 11:34:32 GMT -5
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,562
|
Post by jamesp on Jan 31, 2016 12:09:09 GMT -5
You have to request an MSDS from Vibrafinish. They don't post composition. Guessing the aggressive stuff has SiC. Ceramic Media Descriptions from vibrafinish: P = POLISH: A ceramic media without any abrasives. For burnishing, polishing and driving loose abrasive; COLOR: White; WEIGHT: 85-90 lbs. LC = LIGHT CUT: For general finishing, light cut and low medium wear. Leaves bright finish when used with proper compounds; COLOR: Gray; WEIGHT: 85-90 lbs. M = GENERAL PURPOSE: For general finishing, good metal removal and exceptional wear. Performs in a wide variety of deburr, deflash and radius applications. Vibra Finish's most popular formulation; COLOR: Gray; WEIGHT: 85-90 lbs. SF = FAST CUTTING: Fast cutting media that provides a good finish with a tough long-wearing bond; COLOR: Gray; WEIGHT: 85-90 lbs. XF = EXTRA FAST CUTTING: Media designed for fast metal removal, surface improvements and a low rms finish. Matte finish and moderate wear rate but very efficient due to reduced cycle times; COLOR: Tan; WEIGHT: 85-90 lbs. DF = DENSE SUPER FAST CUTTING: Extremely resistant to fracturing, ideal for high energy applications. Very fast cut facilitated by heavier weight per cu. ft. Debur and radius faster than standard medias; COLOR: Brown; WEIGHT: 95-100 lbs. SC = SILICON CARBIDE: A media used where aluminum oxide impregnation can not be tolerated such as braising, welding or soldering. Good cutting characteristics and good wear; COLOR: Gray; WEIGHT: 85-90 lbs. UFX = ULTRA AGGRESSIVE: Our most aggressive media formulation where metal removal, radiusing and cycle times are primary concerns; COLOR: Blue Gray; WEIGHT: 85-90 lbs.
|
|