Fossilman
Cave Dweller 
Member since January 2009
Posts: 20,726 
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Post by Fossilman on Jan 8, 2015 11:02:04 GMT -5
Has this been added to the forum at all? Thought it to be interesting...
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jerrys
spending too much on rocks
Member since February 2014
Posts: 263
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Post by jerrys on Jan 8, 2015 12:37:25 GMT -5
This method works great for glass but is slower for harder materials. Use PVC fittings with velcro and run resin bonded diamond pads cut to diameter. Will be more expensive up front but will cut run time dramatically and be cost effective long term.
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jerrys
spending too much on rocks
Member since February 2014
Posts: 263
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Post by jerrys on Jan 8, 2015 12:39:36 GMT -5
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Mark K
Cave Dweller
Member since April 2012
Posts: 2,821
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Post by Mark K on Jan 8, 2015 12:43:02 GMT -5
Mac's machines are garbage. I bought a sphere machine and a marble mill. Both are trash and do not hold up long enough for a single completed cycle.
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Post by jakesrocks on Jan 8, 2015 13:16:44 GMT -5
Mike, that's basically a scaled down version of the machines some of us on here have built. If you're planning on building one, I'd go with a larger machine. You can always adapt smaller cups to it for marbles.
Nice little machine though. It wouldn't take up much bench space.
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,726
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Post by Fossilman on Jan 8, 2015 15:24:24 GMT -5
No Don,I have enough pans in the fire...LOL
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Jan 8, 2015 17:25:22 GMT -5
fossilmanif you want to make stone marbles (and I suggest you do!) then this is the fastest and best method You need a dremel to hollow out a silicon carbide grinding block and then a bunch of hardware you prolly already have, plus some diamond granite pads adapted for use inside of pipe fittings to finish and polish.
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Post by jakesrocks on Jan 8, 2015 17:28:54 GMT -5
No Don,I have enough pans in the fire...LOL LOL. Me too Mike. So many rocks & projects, so little time. |
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Post by Rockoonz on Jan 12, 2015 0:30:59 GMT -5
Mac's machines are garbage. I bought a sphere machine and a marble mill. Both are trash and do not hold up long enough for a single completed cycle. The geometry of his 4 head design is interesting, but stepper motors don't have bearings that can hold up to sphere making. |
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Jan 12, 2015 15:49:10 GMT -5
Mac's machines are garbage. I bought a sphere machine and a marble mill. Both are trash and do not hold up long enough for a single completed cycle. The geometry of his 4 head design is interesting, but stepper motors don't have bearings that can hold up to sphere making. +1 to steppers being inappropriate for this use. So are the 20% duty cycle ones that sell for $6 and are also used in crappy machines. If you look at my video above, standard lapidary equipment is used to make marble size spheres. The grind is inside a hollowed out SiC grinder wheel and the pre-polish is using granite pades cut to fit inside of appropriately sized pipe fittings. A friend at my class claims as many as 10 per hour can be made of 3/4" size agate cubes. |
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Post by Rockoonz on Jan 12, 2015 21:37:20 GMT -5
@shotgunner I like the process but the guy who made that video is downright scary.
At about 5 1/2 minutes when his water pump went south and he kept grinding,
causing himself and camera person to breathe the dust. He did the shaping in the SiC
blocks dry as well.
He started AND stopped his grinder unit while leaning over it with his loose shirt tail hanging out.
Add a water line and some common sense and it looks like a good way to make marbles though.
I wonder if he learned the process from this video...(4 parts,
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Jan 12, 2015 21:48:04 GMT -5
Lee; I am aware of both artisans. If you check the dates on the two video makers, mine predates. I used him because of that and because his one video is less tedious than the four from the newer guy you posted. Thanks for posting those too. His work is actually doing the inspiration of the others I know whom are making marbles. Rockoonz |
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jerrys
spending too much on rocks
Member since February 2014
Posts: 263
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Post by jerrys on Jan 16, 2015 14:05:01 GMT -5
Any guesses on what RPM the rubber wheel is the the last four videos? 3450? 1725? I'm considering trying this with a variable speed drill press.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Jan 16, 2015 14:40:06 GMT -5
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jerrys
spending too much on rocks
Member since February 2014
Posts: 263
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Post by jerrys on Jan 16, 2015 15:57:24 GMT -5
I anticipate 3M Super 77 adhesive spray would hold the rubber disc on.
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jerrys
spending too much on rocks
Member since February 2014
Posts: 263
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Post by jerrys on Jan 23, 2015 13:02:11 GMT -5
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Post by TheRock on Dec 25, 2019 0:33:12 GMT -5
Has this been added to the forum at all? Thought it to be interesting... An Old Friend of mine gave me a couple Old Marbles the other day and asked if I could polish them? They are now in the final stage using Chrome Oxide and they are looking really good except for the Nick's that are still left in them.  So Fossilman I came across your post I went to the site you thanked at the end of your Video theglassmarble.com and they mentioned the motors from SURPLUS CENTER They say use a ITEM 5-930 100 RPM, 115VAC $6.65 on Page 129. Well I cant find the Motor is it now a Item# 5-1219? Is that the one I need? Thanks and Merry Christmas. |
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,688
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Post by NRG on Dec 25, 2019 9:14:55 GMT -5
Has this been added to the forum at all? Thought it to be interesting... An Old Friend of mine gave me a couple Old Marbles the other day and asked if I could polish them? They are now in the final stage using Chrome Oxide and they are looking really good except for the Nick's that are still left in them. So Fossilman I came across your post I went to the site you thanked at the end of your Video theglassmarble.com and they mentioned the motors from SURPLUS CENTER They say use a ITEM 5-930 100 RPM, 115VAC $6.65 on Page 129. Well I cant find the Motor is it now a Item# 5-1219? Is that the one I need? Thanks and Merry Christmas. Those $6 motors have a duty cycle like 10%. Sphere machines run continuous. They won't last long as Mark K mentioned long time ago in this thread. Sadly, I have no advice other than to see the video I (I was shotgunner) posted earlier as well. |
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NevadaBill
fully equipped rock polisher
Member since January 2019
Posts: 1,332
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Post by NevadaBill on Dec 25, 2019 13:34:21 GMT -5
This is a pretty cool subject. I once thought about making marbles out of some of the rocks I find.
Anyone remember shooting marbles as a kid? Knocking out the other guys marble and keeping it. At least that's how we played. Not sure if that is the right way.
Try prying the cell phone out of a kids hands these days and try to get him to play 'marbles'! Heh. Yeah, good luck with that.
Thanks for posting this. Real cool.
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pizzano
Cave Dweller
Member since February 2018
Posts: 1,390
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Post by pizzano on Dec 25, 2019 17:19:55 GMT -5
This is a pretty cool subject. I once thought about making marbles out of some of the rocks I find. Anyone remember shooting marbles as a kid? Knocking out the other guys marble and keeping it. At least that's how we played. Not sure if that is the right way. Try prying the cell phone out of a kids hands these days and try to get him to play 'marbles'! Heh. Yeah, good luck with that. Thanks for posting this. Real cool. Yep......we used to (in the dirt) hand grade smooth little allies and stack a small 3 pile.........take our best "pot stickers" and try to down/out the stack......or we'd smooth out a circle, place one at a time in the middle and try to knock it out of the circle, the shooter's had to stay in the circle in order to win the knock out.......!.......damn, that was a very long time ago, surprised I even recollect that 4th grade fun......lol |
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... to the New Guys from The ChatBox V.2 Crew